--- /dev/null
+.project
+.cproject
+odhcp6c
+config.log
+CMakeCache.txt
+CMakeFiles
+CPackConfig.cmake
+CPackSourceConfig.cmake
+_CPack_Packages
+Makefile
+cmake_install.cmake
+install_manifest.txt
+*.deb
+
--- /dev/null
+cmake_minimum_required(VERSION 2.8)
+cmake_policy(SET CMP0015 NEW)
+
+# Project Definition
+project(odhcp6c C)
+set(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -std=c99")
+add_definitions(-D_GNU_SOURCE -Wall -Werror -Wextra -pedantic)
+
+add_executable(odhcp6c src/odhcp6c.c src/dhcpv6.c
+ src/rtnetlink.c src/script.c)
+target_link_libraries(odhcp6c resolv)
+
+# Installation
+install(TARGETS odhcp6c DESTINATION sbin/)
+
+# Packaging information
+set(CPACK_PACKAGE_VERSION "1")
+set(CPACK_PACKAGE_CONTACT "Steven Barth <steven@midlink.org>")
+set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "6ac")
+set(CPACK_GENERATOR "DEB;RPM;STGZ")
+set(CPACK_STRIP_FILES true)
+
+SET(CPACK_DEBIAN_PACKAGE_VERSION ${CPACK_PACKAGE_VERSION})
+set(CPACK_PACKAGE_FILE_NAME "${PROJECT_NAME}_${CPACK_DEBIAN_PACKAGE_VERSION}")
+
+include(CPack)
+
--- /dev/null
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+ 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it. (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.) You can apply it to
+your programs, too.
+
+ When we speak of free software, we are referring to freedom, not
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+
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+
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+ The precise terms and conditions for copying, distribution and
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+\f
+ GNU GENERAL PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
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+Activities other than copying, distribution and modification are not
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+running the Program is not restricted, and the output from the Program
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+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
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+ 1. You may copy and distribute verbatim copies of the Program's
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+ 2. You may modify your copy or copies of the Program or any portion
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+\f
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+a storage or distribution medium does not bring the other work under
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+
+ 3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
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+\f
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+ END OF TERMS AND CONDITIONS
+\f
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
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+free software which everyone can redistribute and change under these terms.
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+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
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+ This program is free software; you can redistribute it and/or modify
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+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ Gnomovision version 69, Copyright (C) year name of author
+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
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+The hypothetical commands `show w' and `show c' should show the appropriate
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+
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+
+ Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Library General
+Public License instead of this License.
--- /dev/null
+odhcp6c - Embedded DHCPv6 Client
+
+
+** Abstract **
+
+odhcp6c is a minimalistic DHCPv6 client for use in embedded Linux systems.
+
+
+** Features **
+
+1. Handling of non-temporary addresses
+ a) assignment of addresses to source interface
+ b) handling of valid and preferred lifetimes
+ c) duplicate address detection
+
+2. Handling of IPv6-Prefixes (Prefix Delegation)
+ a) requesting of prefixes
+
+3. Stateless fallback-support
+
+4. State script support
+
+
+** Compiling **
+
+odhcp6c uses cmake:
+* To prepare a Makefile use: "cmake ."
+* To build / install use: "make" / "make install" afterwards.
+* To build DEB or RPM packages use: "make package" afterwards.
+
+
+** State Script **
+
+The state script is called whenever the DHCPv6 state changes.
+The script is called with the following parameters: <interface> <state>
+
+
+States:
+* bound A suitable server was found and addresses or prefixes acquired
+* informed A stateless information request returned updated information
+* timeout The DHCPv6 operation did not succeed within the defined time
+* updated Updated information was received from the DHCPv6 server
+* rebound The DHCPv6 client switched to another server
+* unbound The DHCPv6 client lost all DHCPv6 servers and will restart
+
+
+Environment:
+* RDNSS A space-separated list of recursive DNS servers
+* DOMAINS A space-separated list of DNS search domains
+* OPTION_<num> Custom option received as base-16
+* PREFIXES A space-separated list of prefixes currently assigned
+ Format: <prefix>/<length>,preferred,valid
+* PREFIXES_LOST A space-separated list of prefixes lost since last update
+
+
+
+
+** Wishlist **
+
+Features that I would like to see implemented in the near or far future:
+
+* Reconfigure Authentication
--- /dev/null
+/**
+ * Copyright (C) 2012 Steven Barth <steven@midlink.org>
+ *
+ * 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
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <time.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <signal.h>
+#include <limits.h>
+#include <resolv.h>
+#include <string.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <stdbool.h>
+#include <sys/time.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include <net/if.h>
+#include <net/ethernet.h>
+
+#include "odhcp6c.h"
+
+
+#define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
+#define DHCPV6_CLIENT_PORT 546
+#define DHCPV6_SERVER_PORT 547
+#define DHCPV6_DUID_LLADDR 3
+#define DHCPV6_REQ_DELAY 1
+
+
+static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
+ const uint8_t transaction[3], enum dhcpv6_msg type);
+
+static time_t dhcpv6_parse_ia(void *opt, void *end);
+
+static reply_handler dhcpv6_handle_reply;
+static reply_handler dhcpv6_handle_advert;
+static reply_handler dhcpv6_handle_rebind_reply;
+static reply_handler dhcpv6_handle_reconfigure;
+static int dhcpv6_commit_advert(uint32_t elapsed);
+
+
+
+// RFC 3315 - 5.5 Timeout and Delay values
+static struct dhcpv6_retx dhcpv6_retx[_DHCPV6_MSG_MAX] = {
+ [DHCPV6_MSG_UNKNOWN] = {false, 1, 120, "<POLL>",
+ dhcpv6_handle_reconfigure, NULL},
+ [DHCPV6_MSG_SOLICIT] = {true, 1, 120, "SOLICIT",
+ dhcpv6_handle_advert, dhcpv6_commit_advert},
+ [DHCPV6_MSG_REQUEST] = {true, 30, 10, "REQUEST",
+ dhcpv6_handle_reply, NULL},
+ [DHCPV6_MSG_RENEW] = {false, 10, 600, "RENEW",
+ dhcpv6_handle_reply, NULL},
+ [DHCPV6_MSG_REBIND] = {false, 10, 600, "REBIND",
+ dhcpv6_handle_rebind_reply, NULL},
+ [DHCPV6_MSG_RELEASE] = {false, 1, 600, "RELEASE", NULL, NULL},
+ [DHCPV6_MSG_DECLINE] = {false, 1, 3, "DECLINE", NULL, NULL},
+ [DHCPV6_MSG_INFO_REQ] = {true, 1, 120, "INFOREQ",
+ dhcpv6_handle_reply, NULL},
+};
+
+
+// Sockets
+static int sock = -1;
+static int urandom_fd = -1;
+static int ifindex = -1;
+static time_t t1 = 0, t2 = 0, t3 = 0;
+
+// IA states
+static int request_prefix = -1;
+static enum odhcp6c_ia_mode na_mode = IA_MODE_NONE;
+static bool accept_reconfig = false;
+
+
+
+int init_dhcpv6(const char *ifname, int request_pd)
+{
+ request_prefix = request_pd;
+ urandom_fd = open("/dev/urandom", O_CLOEXEC | O_RDONLY);
+ if (urandom_fd < 0)
+ return -1;
+
+ sock = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
+
+ // Detect interface
+ struct ifreq ifr;
+ strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+ if (ioctl(sock, SIOCGIFINDEX, &ifr))
+ return -1;
+ ifindex = ifr.ifr_ifindex;
+
+ // Create client DUID
+ size_t client_id_len;
+ odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
+ if (client_id_len == 0) {
+ ioctl(sock, SIOCGIFHWADDR, &ifr);
+ uint8_t duid[14] = {0, DHCPV6_OPT_CLIENTID, 0, 10, 0,
+ DHCPV6_DUID_LLADDR, 0, 1};
+ memcpy(&duid[8], ifr.ifr_hwaddr.sa_data, ETHER_ADDR_LEN);
+ odhcp6c_add_state(STATE_CLIENT_ID, duid, sizeof(duid));
+ }
+
+ // Create ORO
+ uint16_t oro[] = {htons(DHCPV6_OPT_DNS_SERVERS),
+ htons(DHCPV6_OPT_DNS_DOMAIN)};
+ odhcp6c_add_state(STATE_ORO, oro, sizeof(oro));
+
+
+ // Configure IPv6-options
+ int val = 1;
+ setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
+ setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
+ setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
+
+ struct sockaddr_in6 client_addr = { .sin6_family = AF_INET6,
+ .sin6_port = htons(DHCPV6_CLIENT_PORT), .sin6_flowinfo = 0 };
+ if (bind(sock, (struct sockaddr*)&client_addr, sizeof(client_addr)))
+ return -1;
+
+ return 0;
+}
+
+
+void dhcpv6_set_ia_na_mode(enum odhcp6c_ia_mode mode)
+{
+ na_mode = mode;
+}
+
+
+void dhcpv6_remove_addrs(void)
+{
+ size_t ia_na_len;
+ uint8_t *odata, *ia_na = odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
+ uint16_t otype, olen;
+ dhcpv6_for_each_option(ia_na, ia_na + ia_na_len, otype, olen, odata) {
+ struct dhcpv6_ia_addr *addr = (void*)&odata[-4];
+ set_rtnetlink_addr(ifindex, &addr->addr, 0, 0);
+ }
+}
+
+
+static void dhcpv6_send(enum dhcpv6_msg type, uint8_t trid[3], uint32_t ecs)
+{
+ // Build FQDN
+ char fqdn_buf[256];
+ gethostname(fqdn_buf, sizeof(fqdn_buf));
+ struct {
+ uint16_t type;
+ uint16_t len;
+ uint8_t flags;
+ uint8_t data[256];
+ } fqdn;
+ size_t fqdn_len = 5 + dn_comp(fqdn_buf, fqdn.data,
+ sizeof(fqdn.data), NULL, NULL);
+ fqdn.type = htons(DHCPV6_OPT_FQDN);
+ fqdn.len = htons(fqdn_len - 4);
+ fqdn.flags = 0;
+
+
+ // Build Client ID
+ size_t cl_id_len;
+ void *cl_id = odhcp6c_get_state(STATE_CLIENT_ID, &cl_id_len);
+
+ // Get Server ID
+ size_t srv_id_len;
+ void *srv_id = odhcp6c_get_state(STATE_SERVER_ID, &srv_id_len);
+
+ // Build IA_PDs
+ size_t ia_pd_len;
+ void *ia_pd = odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
+ struct dhcpv6_ia_hdr hdr_ia_pd = {
+ htons(DHCPV6_OPT_IA_PD),
+ htons(sizeof(hdr_ia_pd) - 4 + ia_pd_len),
+ 1, 0, 0
+ };
+
+ struct dhcpv6_ia_prefix pref = {
+ .type = htons(DHCPV6_OPT_IA_PREFIX),
+ .len = htons(25), .prefix = request_prefix
+ };
+
+ if (ia_pd_len == 0 && request_prefix > 0 &&
+ (type == DHCPV6_MSG_SOLICIT ||
+ type == DHCPV6_MSG_REQUEST)) {
+ ia_pd = &pref;
+ ia_pd_len = sizeof(pref);
+ }
+
+ // Build IA_NAs
+ size_t ia_na_len;
+ void *ia_na = odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
+ struct dhcpv6_ia_hdr hdr_ia_na = {
+ htons(DHCPV6_OPT_IA_NA),
+ htons(sizeof(hdr_ia_na) - 4 + ia_na_len),
+ 1, 0, 0
+ };
+
+ // Reconfigure Accept
+ struct {
+ uint16_t type;
+ uint16_t length;
+ } reconf_accept = {htons(DHCPV6_OPT_RECONF_ACCEPT), 0};
+
+ // Request Information Refresh
+ uint16_t oro_refresh = htons(DHCPV6_OPT_INFO_REFRESH);
+
+ // Prepare Header
+ size_t oro_len;
+ void *oro = odhcp6c_get_state(STATE_ORO, &oro_len);
+ struct {
+ uint8_t type;
+ uint8_t trid[3];
+ uint16_t elapsed_type;
+ uint16_t elapsed_len;
+ uint16_t elapsed_value;
+ uint16_t oro_type;
+ uint16_t oro_len;
+ } hdr = {
+ type, {trid[0], trid[1], trid[2]},
+ htons(DHCPV6_OPT_ELAPSED), htons(2),
+ htons((ecs > 0xffff) ? 0xffff : ecs),
+ htons(DHCPV6_OPT_ORO), htons(oro_len),
+ };
+
+ struct iovec iov[] = {
+ {&hdr, sizeof(hdr)},
+ {oro, oro_len},
+ {&oro_refresh, 0},
+ {cl_id, cl_id_len},
+ {srv_id, srv_id_len},
+ {&reconf_accept, 0},
+ {&fqdn, fqdn_len},
+ {&hdr_ia_na, sizeof(hdr_ia_na)},
+ {ia_na, ia_na_len},
+ {&hdr_ia_pd, sizeof(hdr_ia_pd)},
+ {ia_pd, ia_pd_len},
+ };
+
+ size_t cnt = ARRAY_SIZE(iov);
+ if (type == DHCPV6_MSG_INFO_REQ) {
+ cnt = 5;
+ iov[2].iov_len = sizeof(oro_refresh);
+ hdr.oro_len = htons(oro_len + sizeof(oro_refresh));
+ } else if (!request_prefix) {
+ cnt = 9;
+ }
+
+ // Disable IAs if not used
+ if (type == DHCPV6_MSG_SOLICIT) {
+ iov[5].iov_len = sizeof(reconf_accept);
+ } else if (type != DHCPV6_MSG_REQUEST) {
+ if (ia_na_len == 0)
+ iov[7].iov_len = 0;
+ if (ia_pd_len == 0)
+ iov[9].iov_len = 0;
+ }
+
+ if (na_mode == IA_MODE_NONE)
+ iov[7].iov_len = 0;
+
+ struct sockaddr_in6 srv = {AF_INET6, htons(DHCPV6_SERVER_PORT),
+ 0, ALL_DHCPV6_RELAYS, ifindex};
+ struct msghdr msg = {&srv, sizeof(srv), iov, cnt, NULL, 0, 0};
+
+ sendmsg(sock, &msg, 0);
+}
+
+
+static int64_t dhcpv6_rand_delay(int64_t time)
+{
+ int random;
+ read(urandom_fd, &random, sizeof(random));
+ return (time * (random % 1000)) / 10000;
+}
+
+
+int dhcpv6_request(enum dhcpv6_msg type)
+{
+ uint8_t buf[1536];
+ uint32_t timeout = UINT32_MAX;
+ struct dhcpv6_retx *retx = &dhcpv6_retx[type];
+
+ if (retx->delay) {
+ struct timespec ts = {0, 0};
+ ts.tv_nsec = dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY);
+ nanosleep(&ts, NULL);
+ }
+
+ if (type == DHCPV6_MSG_RELEASE || type == DHCPV6_MSG_DECLINE)
+ timeout = 3;
+ else if (type == DHCPV6_MSG_UNKNOWN)
+ timeout = t1;
+ else if (type == DHCPV6_MSG_RENEW)
+ timeout = t2 - t1;
+ else if (type == DHCPV6_MSG_REBIND)
+ timeout = t3 - t2;
+
+ if (timeout == 0)
+ return -1;
+
+ syslog(LOG_NOTICE, "Sending %s (timeout %us)", retx->name, timeout);
+
+ uint64_t start = adhc6c_get_milli_time(), round_start = start, elapsed;
+
+ // Generate transaction ID
+ uint8_t trid[3];
+ read(urandom_fd, trid, sizeof(trid));
+ ssize_t len = -1;
+ int64_t rto = 0;
+
+ do {
+ rto = (rto == 0) ? (retx->init_timeo * 1000 +
+ dhcpv6_rand_delay(retx->init_timeo * 1000)) :
+ (2 * rto + dhcpv6_rand_delay(rto));
+
+ if (rto >= retx->max_timeo * 1000)
+ rto = retx->max_timeo * 1000 +
+ dhcpv6_rand_delay(retx->max_timeo * 1000);
+
+ // Calculate end for this round and elapsed time
+ uint64_t round_end = round_start + rto;
+ elapsed = round_start - start;
+
+ // Don't wait too long
+ if (round_end - start > timeout * 1000)
+ round_end = timeout * 1000 + start;
+
+ // Built and send package
+ if (type != DHCPV6_MSG_UNKNOWN)
+ dhcpv6_send(type, trid, elapsed / 10);
+
+ // Receive rounds
+ for (; len < 0 && round_start < round_end;
+ round_start = adhc6c_get_milli_time()) {
+ // Check for pending signal
+ if (odhcp6c_signal_is_pending())
+ return -1;
+
+ // Set timeout for receiving
+ uint64_t t = round_end - round_start;
+ struct timeval timeout = {t / 1000, (t % 1000) * 1000};
+ setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
+ &timeout, sizeof(timeout));
+
+ // Receive cycle
+ len = recv(sock, buf, sizeof(buf), 0);
+
+ if (!dhcpv6_response_is_valid(buf, len, trid, type))
+ len = -1;
+
+ if (len > 0) {
+ uint8_t *opt = &buf[4];
+ uint8_t *opt_end = opt + len - 4;
+
+ round_start = adhc6c_get_milli_time();
+ elapsed = round_start - start;
+ syslog(LOG_NOTICE, "Got a valid reply after "
+ "%ums", (unsigned)elapsed);
+
+ if (retx->handler_reply)
+ len = retx->handler_reply(type,
+ opt, opt_end, elapsed / 1000);
+ }
+ }
+
+ // Allow
+ if (retx->handler_finish)
+ len = retx->handler_finish(elapsed / 1000);
+ } while (len < 0 && elapsed / 1000 < timeout);
+
+ return len;
+}
+
+
+static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
+ const uint8_t transaction[3], enum dhcpv6_msg type)
+{
+ const struct dhcpv6_header *rep = buf;
+ if (len < (ssize_t)sizeof(*rep) || memcmp(rep->tr_id,
+ transaction, sizeof(rep->tr_id)))
+ return false; // Invalid reply
+
+ if (type == DHCPV6_MSG_SOLICIT) {
+ if (rep->msg_type != DHCPV6_MSG_ADVERT &&
+ rep->msg_type != DHCPV6_MSG_REPLY)
+ return false;
+ } else if (type == DHCPV6_MSG_UNKNOWN) {
+ if (!accept_reconfig || rep->msg_type != DHCPV6_MSG_RECONF)
+ return false;
+ } else if (rep->msg_type != DHCPV6_MSG_REPLY) {
+ return false;
+ }
+
+ uint8_t *end = ((uint8_t*)buf) + len, *odata;
+ uint16_t otype, olen;
+ bool clientid_ok = false, serverid_ok = false;
+
+ size_t client_id_len, server_id_len;
+ void *client_id = odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
+ void *server_id = odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
+
+ dhcpv6_for_each_option(&rep[1], end, otype, olen, odata)
+ if (otype == DHCPV6_OPT_CLIENTID)
+ clientid_ok = (olen + 4U == client_id_len) && !memcmp(
+ &odata[-4], client_id, client_id_len);
+ else if (otype == DHCPV6_OPT_SERVERID)
+ serverid_ok = (olen + 4U == server_id_len) && !memcmp(
+ &odata[-4], server_id, server_id_len);
+
+ return clientid_ok && (serverid_ok || server_id_len == 0);
+}
+
+
+int dhcpv6_poll_reconfigure(void)
+{
+ int ret = dhcpv6_request(DHCPV6_MSG_UNKNOWN);
+ if (ret != -1)
+ ret = dhcpv6_request(ret);
+
+ return ret;
+}
+
+
+static int dhcpv6_handle_reconfigure(_unused enum dhcpv6_msg orig,
+ const void *opt, const void *end, uint32_t elapsed)
+{
+ // TODO: should verify the reconfigure message
+ uint16_t otype, olen;
+ uint8_t *odata, msg = DHCPV6_MSG_RENEW;
+ dhcpv6_for_each_option(opt, end, otype, olen, odata)
+ if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1 && (
+ odata[0] == DHCPV6_MSG_RENEW ||
+ odata[0] == DHCPV6_MSG_INFO_REQ))
+ msg = odata[0];
+
+ t1 -= elapsed;
+ t2 -= elapsed;
+ t3 -= elapsed;
+
+ if (t1 < 0)
+ t1 = 0;
+
+ if (t2 < 0)
+ t2 = 0;
+
+ if (t3 < 0)
+ t3 = 0;
+
+ dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, NULL, NULL, elapsed);
+ return msg;
+}
+
+
+// Collect all advertised servers
+static int dhcpv6_handle_advert(_unused enum dhcpv6_msg orig,
+ const void *opt, const void *end, _unused uint32_t elapsed)
+{
+ uint16_t olen, otype;
+ uint8_t *odata;
+ struct dhcpv6_server_cand cand = {false, false, 0, 0, {0}};
+
+ dhcpv6_for_each_option(opt, end, otype, olen, odata) {
+ if (otype == DHCPV6_OPT_SERVERID && olen <= 130) {
+ memcpy(cand.duid, odata, olen);
+ cand.duid_len = olen;
+ } else if (otype == DHCPV6_OPT_STATUS && olen >= 2 &&
+ !odata[0] && odata[1] == DHCPV6_NoAddrsAvail) {
+ if (na_mode == IA_MODE_FORCE) {
+ return -1;
+ } else {
+ cand.has_noaddravail = true;
+ cand.preference -= 1000;
+ }
+ } else if (otype == DHCPV6_OPT_PREF && olen >= 1 &&
+ cand.preference >= 0) {
+ cand.preference = odata[1];
+ } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
+ cand.wants_reconfigure = true;
+ }
+ else if (otype == DHCPV6_OPT_IA_PD && request_prefix) {
+ struct dhcpv6_ia_hdr *h = (void*)odata;
+ uint8_t *oend = odata + olen, *d;
+ dhcpv6_for_each_option(&h[1], oend, otype, olen, d) {
+ if (otype == DHCPV6_OPT_IA_PREFIX)
+ cand.preference += 2000;
+ else if (otype == DHCPV6_OPT_STATUS &&
+ olen >= 2 && d[0] == 0 &&
+ d[1] == DHCPV6_NoPrefixAvail)
+ return -1;
+ }
+ }
+ }
+
+ if (cand.duid_len > 0)
+ odhcp6c_add_state(STATE_SERVER_CAND, &cand, sizeof(cand));
+
+ return -1;
+}
+
+
+static int dhcpv6_commit_advert(_unused uint32_t elapsed)
+{
+ size_t cand_len;
+ struct dhcpv6_server_cand *c = NULL, *cand =
+ odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
+
+ bool retry = false;
+ for (size_t i = 0; i < cand_len / sizeof(*c); ++i) {
+ if (cand[i].has_noaddravail)
+ retry = true; // We want to try again
+
+ if (!c || c->preference < cand[i].preference)
+ c = &cand[i];
+ }
+
+ if (retry && na_mode == IA_MODE_TRY) {
+ // We give it a second try without the IA_NA
+ na_mode = IA_MODE_NONE;
+ return dhcpv6_request(DHCPV6_MSG_SOLICIT);
+ }
+
+ if (c) {
+ uint16_t hdr[2] = {htons(DHCPV6_OPT_SERVERID),
+ htons(c->duid_len)};
+ odhcp6c_add_state(STATE_SERVER_ID, hdr, sizeof(hdr));
+ odhcp6c_add_state(STATE_SERVER_ID, c->duid, c->duid_len);
+ accept_reconfig = c->wants_reconfigure;
+ }
+
+ odhcp6c_clear_state(STATE_SERVER_CAND);
+
+ if (!c)
+ return -1;
+ else if (request_prefix || na_mode != IA_MODE_NONE)
+ return DHCPV6_STATEFUL;
+ else
+ return DHCPV6_STATELESS;
+}
+
+
+static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig,
+ const void *opt, const void *end, uint32_t elapsed)
+{
+ dhcpv6_handle_advert(orig, opt, end, elapsed);
+ if (dhcpv6_commit_advert(elapsed) < 0)
+ return -1;
+
+ return dhcpv6_handle_reply(orig, opt, end, elapsed);
+}
+
+
+static int dhcpv6_handle_reply(_unused enum dhcpv6_msg orig,
+ const void *opt, const void *end, uint32_t elapsed)
+{
+ uint16_t otype, olen;
+ uint8_t *odata;
+ bool have_update = false;
+
+ t1 = t2 = t3 = 86400;
+
+ size_t ia_na_len, dns_len, search_len;
+ uint8_t *ia_na = odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
+ uint8_t *ia_end;
+ odhcp6c_get_state(STATE_DNS, &dns_len);
+ odhcp6c_get_state(STATE_SEARCH, &search_len);
+
+ // Decrease valid and preferred lifetime of prefixes
+ size_t ia_pd_len;
+ uint8_t *ia_pd = odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
+ dhcpv6_for_each_option(ia_pd, ia_pd + ia_pd_len, otype, olen, odata) {
+ struct dhcpv6_ia_prefix *p = (void*)&odata[-4];
+ uint32_t valid = ntohl(p->valid);
+ p->valid = (valid < elapsed) ? 0 : htonl(valid - elapsed);
+
+ uint32_t pref = ntohl(p->preferred);
+ p->preferred = (pref < elapsed) ? 0 : htonl(pref - elapsed);
+ }
+
+ // Decrease valid and preferred lifetime of addresses
+ dhcpv6_for_each_option(ia_na, ia_na + ia_na_len, otype, olen, odata) {
+ struct dhcpv6_ia_addr *p = (void*)&odata[-4];
+ uint32_t valid = ntohl(p->valid);
+ p->valid = (valid < elapsed) ? 0 : htonl(valid - elapsed);
+
+ uint32_t pref = ntohl(p->preferred);
+ p->preferred = (pref < elapsed) ? 0 : htonl(pref - elapsed);
+ }
+
+ // Parse and find all matching IAs
+ dhcpv6_for_each_option(opt, end, otype, olen, odata) {
+ if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)
+ && olen > sizeof(struct dhcpv6_ia_hdr)) {
+ struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
+ time_t l_t1 = ntohl(ia_hdr->t1);
+ time_t l_t2 = ntohl(ia_hdr->t2);
+
+ // Test ID and T1-T2 validity
+ if (ia_hdr->iaid != 1 || l_t2 < l_t1)
+ continue;
+
+ uint16_t stype, slen;
+ uint8_t *sdata;
+ // Test status and bail if error
+ dhcpv6_for_each_option(&ia_hdr[1], odata + olen,
+ stype, slen, sdata)
+ if (stype == DHCPV6_OPT_STATUS && slen >= 2 &&
+ (sdata[0] || sdata[1]))
+ continue;
+
+ // Update times
+ if (l_t1 > 0 && t1 > l_t1)
+ t1 = l_t1;
+
+ if (l_t2 > 0 && t2 > l_t2)
+ t2 = l_t2;
+
+
+ time_t n = dhcpv6_parse_ia(&ia_hdr[1], odata + olen);
+
+ if (n < t1)
+ t1 = n;
+
+ if (n < t2)
+ t2 = n;
+
+ if (n < t3)
+ t3 = n;
+
+ } else if (otype == DHCPV6_OPT_DNS_SERVERS) {
+ odhcp6c_add_state(STATE_DNS, odata, olen);
+ } else if (otype == DHCPV6_OPT_DNS_DOMAIN) {
+ odhcp6c_add_state(STATE_SEARCH, odata, olen);
+ } else if (otype == DHCPV6_OPT_INFO_REFRESH && olen >= 4) {
+ uint32_t refresh = ntohl(*((uint32_t*)odata));
+ if (refresh < (uint32_t)t1)
+ t1 = refresh;
+ } else if (otype != DHCPV6_OPT_CLIENTID &&
+ otype != DHCPV6_OPT_SERVERID) {
+ odhcp6c_add_state(STATE_CUSTOM_OPTS,
+ &odata[-4], olen + 4);
+ }
+ }
+
+ if (opt) {
+ have_update |= odhcp6c_commit_state(STATE_DNS, dns_len);
+ have_update |= odhcp6c_commit_state(STATE_SEARCH, search_len);
+ size_t new_ia_pd_len, new_ia_na_len;
+ odhcp6c_get_state(STATE_IA_PD, &new_ia_pd_len);
+ odhcp6c_get_state(STATE_IA_NA, &new_ia_na_len);
+ have_update |= (new_ia_pd_len != ia_pd_len) ||
+ (new_ia_na_len != ia_na_len);
+ }
+
+ // Delete prefixes with 0 valid-time
+ ia_pd = odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
+ ia_end = ia_pd + ia_pd_len;
+ dhcpv6_for_each_option(ia_pd, ia_end, otype, olen, odata) {
+ struct dhcpv6_ia_prefix *p = (void*)&odata[-4];
+ while (!p->valid) {
+ ia_end = ia_pd + odhcp6c_remove_state(STATE_IA_PD,
+ (uint8_t*)p - ia_pd, olen + 4);
+ have_update = true;
+ }
+ }
+
+
+ // Delete addresses with 0 valid-time
+ ia_na = odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
+ ia_end = ia_na + ia_na_len;
+ dhcpv6_for_each_option(ia_na, ia_end, otype, olen, odata) {
+ struct dhcpv6_ia_addr *p = (void*)&odata[-4];
+ while (!p->valid) {
+ ia_end = ia_na + odhcp6c_remove_state(STATE_IA_NA,
+ (uint8_t*)p - ia_na, olen + 4);
+ have_update = true;
+ }
+ }
+
+ return have_update;
+}
+
+
+static time_t dhcpv6_parse_ia(void *opt, void *end)
+{
+ uint32_t timeout = UINT32_MAX; // Minimum timeout
+ uint16_t otype, olen, stype, slen;
+ uint8_t *odata, *sdata;
+
+ // Update address IA
+ dhcpv6_for_each_option(opt, end, otype, olen, odata) {
+ if (otype == DHCPV6_OPT_IA_PREFIX) {
+ struct dhcpv6_ia_prefix *prefix = (void*)&odata[-4];
+ if (olen + 4U < sizeof(*prefix))
+ continue;
+
+ olen = sizeof(*prefix); // Normalize length
+ uint32_t valid = ntohl(prefix->valid);
+ uint32_t pref = ntohl(prefix->preferred);
+
+ if (pref > valid)
+ continue;
+
+ // Search matching IA
+ struct dhcpv6_ia_prefix *local = NULL;
+ size_t pd_len;
+ uint8_t *pd = odhcp6c_get_state(STATE_IA_PD, &pd_len);
+ dhcpv6_for_each_option(pd, pd + pd_len,
+ stype, slen, sdata)
+ if (!memcmp(sdata + 8, odata + 8,
+ sizeof(local->addr) + 1))
+ local = (void*)&sdata[-4];
+
+ if (local) { // Already know that IA
+ local->preferred = prefix->preferred;
+ local->valid = prefix->valid;
+ } else { // New IA
+ odhcp6c_add_state(STATE_IA_PD, prefix, olen);
+ }
+
+ if (timeout > valid)
+ timeout = valid;
+
+ if (prefix->valid == 0) // We probably lost that prefix
+ odhcp6c_add_state(STATE_IA_PD_LOST,
+ prefix, olen);
+ } else if (otype == DHCPV6_OPT_IA_ADDR) {
+ struct dhcpv6_ia_addr *addr = (void*)&odata[-4];
+ if (olen + 4U < sizeof(*addr))
+ continue;
+
+ olen = sizeof(*addr); // Normalize length
+ uint32_t pref = ntohl(addr->preferred);
+ uint32_t valid = ntohl(addr->valid);
+
+ if (pref > valid)
+ continue;
+
+ // Search matching IA
+ struct dhcpv6_ia_addr *local = NULL;
+ size_t na_len;
+ uint8_t *na = odhcp6c_get_state(STATE_IA_NA, &na_len);
+ dhcpv6_for_each_option(na, na + na_len,
+ stype, slen, sdata)
+ if (!memcmp(sdata, odata, sizeof(local->addr)))
+ local = (void*)&sdata[-4];
+
+
+ if (local) { // Already know that IA
+ local->preferred = addr->preferred;
+ local->valid = addr->valid;
+ } else { // New IA
+ odhcp6c_add_state(STATE_IA_NA, addr, olen);
+ }
+
+
+ if (timeout > valid)
+ timeout = valid;
+
+ if (set_rtnetlink_addr(ifindex, &addr->addr,
+ pref, valid) == -EADDRNOTAVAIL) {
+ dhcpv6_request(DHCPV6_MSG_DECLINE);
+ raise(SIGUSR2);
+ }
+ }
+ }
+
+ return timeout;
+}
--- /dev/null
+/**
+ * Copyright (C) 2012 Steven Barth <steven@midlink.org>
+ *
+ * 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
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <time.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <signal.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include <net/if.h>
+#include <sys/wait.h>
+#include <sys/syscall.h>
+
+#include "odhcp6c.h"
+
+
+static void sighandler(int signal);
+static int sysctl_interface(const char *ifname, const char *option,
+ const char *data);
+static int usage(void);
+
+
+static uint8_t *state_data[_STATE_MAX] = {NULL};
+static size_t state_len[_STATE_MAX] = {0};
+
+static volatile int do_signal = 0;
+
+
+int main(_unused int argc, char* const argv[])
+{
+ openlog("odhcp6c", LOG_PERROR | LOG_PID, LOG_DAEMON);
+
+ // Allocate ressources
+ const char *pidfile = NULL;
+ const char *script = "/usr/sbin/odhcp6c-update";
+ ssize_t l;
+ uint8_t buf[134];
+ char *optpos;
+ uint16_t opttype;
+ enum odhcp6c_ia_mode ia_na_mode = IA_MODE_TRY;
+
+ bool help = false, daemonize = false, reset = false;
+ int c, request_pd = 0, timeout = 0;
+ while ((c = getopt(argc, argv, "RN:P:c:r:s:t:hdp:")) != -1) {
+ switch (c) {
+ case 'R':
+ reset = true;
+ break;
+
+ case 'N':
+ if (!strcmp(optarg, "force"))
+ ia_na_mode = IA_MODE_FORCE;
+ else if (!strcmp(optarg, "none"))
+ ia_na_mode = IA_MODE_NONE;
+ else if (!strcmp(optarg, "try"))
+ ia_na_mode = IA_MODE_TRY;
+ else
+ help = true;
+ break;
+
+ case 'P':
+ request_pd = strtoul(optarg, NULL, 10);
+ if (request_pd == 0)
+ request_pd = -1;
+ break;
+
+ case 'c':
+ l = script_unhexlify(&buf[4], sizeof(buf) - 4, optarg);
+ if (l > 0) {
+ buf[0] = 0;
+ buf[1] = DHCPV6_OPT_CLIENTID;
+ buf[2] = 0;
+ buf[4] = l;
+ odhcp6c_add_state(STATE_CLIENT_ID, buf, l + 4);
+ } else {
+ help = true;
+ }
+ break;
+
+ case 'r':
+ optpos = optarg;
+ while (optpos[0]) {
+ opttype = htons(strtoul(optarg, &optpos, 10));
+ if (optpos == optarg)
+ break;
+ else if (optpos[0])
+ optarg = &optpos[1];
+ odhcp6c_add_state(STATE_ORO, &opttype, 2);
+ }
+ break;
+
+ case 's':
+ script = optarg;
+ break;
+
+ case 't':
+ timeout = strtoul(optarg, NULL, 10);
+ break;
+
+ case 'd':
+ daemonize = true;
+ break;
+
+ case 'p':
+ pidfile = optarg;
+ break;
+
+ default:
+ help = true;
+ break;
+ }
+ }
+
+ const char *ifname = argv[optind];
+
+ if (help || !ifname)
+ return usage();
+
+ if (init_dhcpv6(ifname, request_pd) || init_rtnetlink() ||
+ script_init(script, ifname)) {
+ syslog(LOG_ERR, "failed to initialize: %s", strerror(errno));
+ return 3;
+ }
+
+ signal(SIGHUP, sighandler);
+ signal(SIGINT, sighandler);
+ signal(SIGALRM, sighandler);
+ signal(SIGCHLD, sighandler);
+ signal(SIGTERM, sighandler);
+ signal(SIGUSR1, sighandler);
+ signal(SIGUSR2, sighandler);
+
+ // Configure interface to accept RA
+ if (reset) {
+ sysctl_interface(ifname, "disable_ipv6", "1");
+ sysctl_interface(ifname, "accept_ra", "2");
+ sysctl_interface(ifname, "disable_ipv6", "0");
+ }
+
+ if (daemonize) {
+ openlog("odhcp6c", LOG_PID, LOG_DAEMON); // Disable LOG_PERROR
+ if (daemon(0, 0)) {
+ syslog(LOG_ERR, "Failed to daemonize: %s",
+ strerror(errno));
+ return 4;
+ }
+
+ char pidbuf[128];
+ if (!pidfile) {
+ snprintf(pidbuf, sizeof(pidbuf),
+ "/var/run/odhcp6c.%s.pid", ifname);
+ pidfile = pidbuf;
+ }
+
+ int fd = open(pidfile, O_WRONLY | O_CREAT);
+ if (fd >= 0) {
+ char buf[8];
+ int len = snprintf(buf, sizeof(buf), "%i\n", getpid());
+ write(fd, buf, len);
+ close(fd);
+ }
+ }
+
+ while (do_signal != SIGTERM) { // Main logic
+ odhcp6c_clear_state(STATE_SERVER_ID);
+ odhcp6c_clear_state(STATE_SERVER_CAND);
+ odhcp6c_clear_state(STATE_IA_PD);
+ odhcp6c_clear_state(STATE_IA_PD_LOST);
+ dhcpv6_set_ia_na_mode(ia_na_mode);
+
+ alarm(timeout);
+ do_signal = 0;
+ int res = dhcpv6_request(DHCPV6_MSG_SOLICIT);
+
+ if (res < 0) {
+ continue; // Might happen if we got a signal
+ } else if (res == DHCPV6_STATELESS) { // Stateless mode
+ while (do_signal == 0 || do_signal == SIGUSR1) {
+ do_signal = 0;
+
+ res = dhcpv6_request(DHCPV6_MSG_INFO_REQ);
+ if (do_signal == SIGUSR1)
+ continue;
+ else if (res < 0)
+ break;
+ else if (res > 0)
+ script_call("informed");
+
+ alarm(0);
+ if (dhcpv6_poll_reconfigure() > 0)
+ script_call("informed");
+ }
+
+ if (do_signal == SIGALRM)
+ script_call("timeout");
+
+ continue;
+ }
+
+ // Stateful mode
+ if (dhcpv6_request(DHCPV6_MSG_REQUEST) < 0)
+ continue;
+
+ script_call("bound");
+ alarm(0);
+
+ while (do_signal == 0 || do_signal == SIGUSR1) {
+ // Renew Cycle
+ // Wait for T1 to expire or until we get a reconfigure
+ int res = dhcpv6_poll_reconfigure();
+ if (res >= 0) {
+ if (res > 0)
+ script_call("updated");
+
+ continue;
+ }
+
+ // Handle signal, if necessary
+ if (do_signal == SIGUSR1)
+ do_signal = 0; // Acknowledged
+ else if (do_signal > 0)
+ break; // Other signal type
+
+ size_t ia_pd_len, ia_na_len, ia_pd_new, ia_na_new;
+ odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
+ odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
+
+ // If we have any IAs, send renew, otherwise request
+ int r;
+ if (ia_pd_len == 0 && ia_na_len == 0)
+ r = dhcpv6_request(DHCPV6_MSG_REQUEST);
+ else
+ r = dhcpv6_request(DHCPV6_MSG_RENEW);
+ if (r > 0) // Publish updates
+ script_call("updated");
+ if (r >= 0)
+ continue; // Renew was successful
+
+ odhcp6c_clear_state(STATE_SERVER_ID); // Remove binding
+
+ // If we have IAs, try rebind otherwise restart
+ res = dhcpv6_request(DHCPV6_MSG_REBIND);
+
+ odhcp6c_get_state(STATE_IA_PD, &ia_pd_new);
+ odhcp6c_get_state(STATE_IA_NA, &ia_na_new);
+ if (res < 0 || (ia_pd_new == 0 && ia_pd_len) ||
+ (ia_na_new == 0 && ia_na_len))
+ break; // We lost all our IAs, restart
+ else if (res > 0)
+ script_call("rebound");
+ }
+
+
+ size_t ia_pd_len, ia_na_len, server_id_len;
+ uint8_t *ia_pd = odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
+ odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
+ odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
+
+ // Add all prefixes to lost prefixes
+ odhcp6c_add_state(STATE_IA_PD_LOST, ia_pd, ia_pd_len);
+ odhcp6c_clear_state(STATE_IA_PD);
+
+ if (do_signal == SIGALRM)
+ script_call("timeout");
+ else
+ script_call("unbound");
+
+ // Remove assigned addresses
+ if (ia_na_len > 0)
+ dhcpv6_remove_addrs();
+
+ if (server_id_len > 0 && (ia_pd_len > 0 || ia_na_len > 0))
+ dhcpv6_request(DHCPV6_MSG_RELEASE);
+ }
+
+ return 0;
+}
+
+
+static int usage(void)
+{
+ const char buf[] =
+ "Usage: odhcp6c [options] <interface>\n"
+ "\nFeature options:\n"
+ " -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"
+ " -r <options> Options to be requested (comma-separated)\n"
+ " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
+ " -t <timeout> Request timeout after which the script is called\n"
+ "\nInvocation options:\n"
+ " -p <pidfile> Set pidfile (/var/run/6relayd.pid)\n"
+ " -d Daemonize\n"
+ //" -v Increase logging verbosity\n"
+ " -h Show this help\n\n";
+ write(STDERR_FILENO, buf, sizeof(buf));
+ return 1;
+}
+
+
+// Don't want to pull-in librt and libpthread just for a monotonic clock...
+uint64_t adhc6c_get_milli_time(void)
+{
+ struct timespec t = {0, 0};
+ syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &t);
+ return t.tv_sec * 1000 + t.tv_nsec / 1000000;
+}
+
+
+static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state, ssize_t len)
+{
+ if (len == 0)
+ return state_data[state] + state_len[state];
+
+ syslog(LOG_WARNING, "state_reisze: %i %i %i", (int)state, (int)state_len[state], (int)len);
+ uint8_t *n = realloc(state_data[state], state_len[state] + len);
+ if (n || state_len[state] + len == 0) {
+ state_data[state] = n;
+ n += state_len[state];
+ state_len[state] += len;
+ }
+ return n;
+}
+
+
+bool odhcp6c_signal_is_pending(void)
+{
+ return do_signal != 0;
+}
+
+
+void odhcp6c_clear_state(enum odhcp6c_state state)
+{
+ state_len[state] = 0;
+}
+
+
+void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len)
+{
+ uint8_t *n = odhcp6c_resize_state(state, len);
+ if (n)
+ memcpy(n, data, len);
+}
+
+
+size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len)
+{
+ uint8_t *data = state_data[state];
+ ssize_t len_after = state_len[state] - (offset + len);
+ if (len_after < 0)
+ return state_len[state];
+
+ memmove(data + offset, data + offset + len, len_after);
+ return state_len[state] -= len;
+}
+
+
+bool odhcp6c_commit_state(enum odhcp6c_state state, size_t old_len)
+{
+ size_t new_len = state_len[state] - old_len;
+ uint8_t *old_data = state_data[state], *new_data = old_data + old_len;
+ bool upd = new_len != old_len || memcmp(old_data, new_data, new_len);
+
+ memmove(old_data, new_data, new_len);
+ odhcp6c_resize_state(state, -old_len);
+
+ return upd;
+}
+
+
+void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len)
+{
+ *len = state_len[state];
+ return state_data[state];
+}
+
+
+static int sysctl_interface(const char *ifname, const char *option,
+ const char *data)
+{
+ char pathbuf[64];
+ const char *sysctl_pattern = "/proc/sys/net/ipv6/conf/%s/%s";
+ snprintf(pathbuf, sizeof(pathbuf), sysctl_pattern, ifname, option);
+
+ int fd = open(pathbuf, O_WRONLY);
+ int written = write(fd, data, strlen(data));
+ close(fd);
+
+ return (written > 0) ? 0 : -1;
+}
+
+
+static void sighandler(int signal)
+{
+ if (signal == SIGCHLD)
+ while (waitpid(-1, NULL, WNOHANG) > 0);
+ else if (signal == SIGUSR1)
+ do_signal = SIGUSR1;
+ else if (signal == SIGUSR2)
+ do_signal = SIGUSR2;
+ else if (signal == SIGALRM)
+ do_signal = SIGALRM;
+ else
+ do_signal = SIGTERM;
+}
--- /dev/null
+/**
+ * Copyright (C) 2012 Steven Barth <steven@midlink.org>
+ *
+ * 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
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+#pragma once
+#include <stdint.h>
+#include <stdbool.h>
+#include <netinet/in.h>
+
+#define _unused __attribute__((unused))
+#define _packed __attribute__((packed))
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+#ifndef SOL_NETLINK
+#define SOL_NETLINK 270
+#endif
+
+#define ND_OPT_RECURSIVE_DNS 25
+#define ND_OPT_DNSSL 31
+
+enum dhcvp6_opt {
+ DHCPV6_OPT_CLIENTID = 1,
+ DHCPV6_OPT_SERVERID = 2,
+ DHCPV6_OPT_IA_NA = 3,
+ DHCPV6_OPT_IA_ADDR = 5,
+ DHCPV6_OPT_ORO = 6,
+ DHCPV6_OPT_PREF = 7,
+ DHCPV6_OPT_ELAPSED = 8,
+ DHCPV6_OPT_RELAY_MSG = 9,
+ DHCPV6_OPT_AUTH = 11,
+ DHCPV6_OPT_STATUS = 13,
+ DHCPV6_OPT_RAPID_COMMIT = 14,
+ DHCPV6_OPT_RECONF_MESSAGE = 19,
+ DHCPV6_OPT_RECONF_ACCEPT = 20,
+ DHCPV6_OPT_DNS_SERVERS = 23,
+ DHCPV6_OPT_DNS_DOMAIN = 24,
+ DHCPV6_OPT_IA_PD = 25,
+ DHCPV6_OPT_IA_PREFIX = 26,
+ DHCPV6_OPT_INFO_REFRESH = 32,
+ DHCPV6_OPT_FQDN = 39,
+};
+
+enum dhcpv6_msg {
+ DHCPV6_MSG_UNKNOWN = 0,
+ DHCPV6_MSG_SOLICIT = 1,
+ DHCPV6_MSG_ADVERT = 2,
+ DHCPV6_MSG_REQUEST = 3,
+ DHCPV6_MSG_RENEW = 5,
+ DHCPV6_MSG_REBIND = 6,
+ DHCPV6_MSG_REPLY = 7,
+ DHCPV6_MSG_RELEASE = 8,
+ DHCPV6_MSG_DECLINE = 9,
+ DHCPV6_MSG_RECONF = 10,
+ DHCPV6_MSG_INFO_REQ = 11,
+ _DHCPV6_MSG_MAX
+};
+
+enum dhcpv6_status {
+ DHCPV6_NoAddrsAvail = 2,
+ DHCPV6_NoPrefixAvail = 6,
+};
+
+typedef int(reply_handler)(enum dhcpv6_msg orig,
+ const void *opt, const void *end, uint32_t elapsed);
+
+// retransmission strategy
+struct dhcpv6_retx {
+ bool delay;
+ uint8_t init_timeo;
+ uint16_t max_timeo;
+ char name[8];
+ reply_handler *handler_reply;
+ int(*handler_finish)(uint32_t elapsed);
+};
+
+
+// DHCPv6 Protocol Headers
+struct dhcpv6_header {
+ uint8_t msg_type;
+ uint8_t tr_id[3];
+} __attribute__((packed));
+
+struct dhcpv6_ia_hdr {
+ uint16_t type;
+ uint16_t len;
+ uint32_t iaid;
+ uint32_t t1;
+ uint32_t t2;
+} _packed;
+
+struct dhcpv6_ia_addr {
+ uint16_t type;
+ uint16_t len;
+ struct in6_addr addr;
+ uint32_t preferred;
+ uint32_t valid;
+} _packed;
+
+struct dhcpv6_ia_prefix {
+ uint16_t type;
+ uint16_t len;
+ uint32_t preferred;
+ uint32_t valid;
+ uint8_t prefix;
+ struct in6_addr addr;
+} _packed;
+
+struct dhcpv6_duid {
+ uint16_t type;
+ uint16_t len;
+ uint16_t duid_type;
+ uint8_t data[128];
+} _packed;
+
+
+#define dhcpv6_for_each_option(start, end, otype, olen, odata)\
+ for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
+ ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
+ ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
+ _o += 4 + (_o[2] << 8 | _o[3]))
+
+
+struct dhcpv6_server_cand {
+ bool has_noaddravail;
+ bool wants_reconfigure;
+ int16_t preference;
+ uint8_t duid_len;
+ uint8_t duid[130];
+};
+
+
+enum odhcp6c_state {
+ STATE_CLIENT_ID,
+ STATE_SERVER_ID,
+ STATE_SERVER_CAND,
+ STATE_ORO,
+ STATE_DNS,
+ STATE_SEARCH,
+ STATE_IA_NA,
+ STATE_IA_PD,
+ STATE_IA_PD_LOST,
+ STATE_CUSTOM_OPTS,
+ _STATE_MAX
+};
+
+
+struct icmp6_opt {
+ uint8_t type;
+ uint8_t len;
+ uint8_t data[6];
+};
+
+
+enum dhcpv6_mode {
+ DHCPV6_UNKNOWN,
+ DHCPV6_STATELESS,
+ DHCPV6_STATEFUL
+};
+
+
+enum odhcp6c_ia_mode {
+ IA_MODE_NONE,
+ IA_MODE_TRY,
+ IA_MODE_FORCE,
+};
+
+
+int init_dhcpv6(const char *ifname, int request_pd);
+void dhcpv6_set_ia_na_mode(enum odhcp6c_ia_mode mode);
+int dhcpv6_request(enum dhcpv6_msg type);
+int dhcpv6_poll_reconfigure(void);
+void dhcpv6_remove_addrs(void);
+
+int init_rtnetlink(void);
+int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
+ time_t pref, time_t valid);
+
+int script_init(const char *path, const char *ifname);
+ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
+void script_call(const char *status);
+
+
+// State manipulation
+bool odhcp6c_signal_is_pending(void);
+uint64_t adhc6c_get_milli_time(void);
+void odhcp6c_clear_state(enum odhcp6c_state state);
+void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
+size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
+bool odhcp6c_commit_state(enum odhcp6c_state state, size_t old_len);
+void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
+
--- /dev/null
+/**
+ * Copyright (C) 2012 Steven Barth <steven@midlink.org>
+ *
+ * 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
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <time.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <stdbool.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <linux/rtnetlink.h>
+
+#include "odhcp6c.h"
+
+
+static int sock = -1;
+static unsigned seq = 0;
+
+
+// Init rtnetlink socket
+int init_rtnetlink(void)
+{
+ sock = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
+ struct sockaddr_nl rtnl_kernel = { .nl_family = AF_NETLINK };
+ if (connect(sock, (struct sockaddr*)&rtnl_kernel, sizeof(rtnl_kernel)))
+ return -1;
+
+ return 0;
+}
+
+
+// CRUD addresses to interface
+int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
+ time_t pref, time_t valid)
+{
+ int flags = NLM_F_REQUEST | NLM_F_ACK;
+ int cmd = RTM_DELADDR;
+
+ if (valid > 0) {
+ flags |= NLM_F_CREATE | NLM_F_REPLACE;
+ cmd = RTM_NEWADDR;
+ }
+
+ struct {
+ struct nlmsghdr nhm;
+ struct ifaddrmsg ifa;
+ struct rtattr rta_addr;
+ struct in6_addr addr;
+ struct rtattr rta_local;
+ struct in6_addr local;
+ struct rtattr rta_info;
+ struct ifa_cacheinfo info;
+ } req = {
+ {sizeof(req), cmd, flags, ++seq, 0},
+ {AF_INET6, 128, 0, RT_SCOPE_UNIVERSE, ifindex},
+ {sizeof(req.rta_addr) + sizeof(req.addr), IFA_ADDRESS},
+ *addr,
+ {sizeof(req.rta_local) + sizeof(req.local), IFA_LOCAL},
+ *addr,
+ {sizeof(req.rta_info) + sizeof(req.info), IFA_CACHEINFO},
+ {pref, valid, 0, 0}
+ };
+ send(sock, &req, sizeof(req), 0);
+
+ struct {
+ struct nlmsghdr nhm;
+ struct nlmsgerr err;
+ } reply;
+ recv(sock, &reply, sizeof(reply), 0);
+
+ char buf[INET6_ADDRSTRLEN];
+ inet_ntop(AF_INET6, addr, buf, sizeof(buf));
+ syslog(LOG_WARNING, "%s address %s/128 for iface %i: %s",
+ (valid) ? "assigning" : "removing", buf,
+ ifindex, strerror(-reply.err.error));
+
+ if (reply.err.error < 0 || valid == 0)
+ return reply.err.error;
+
+ // Check for duplicate addresses
+ struct timespec ts = {1, 0};
+ nanosleep(&ts, NULL);
+
+ req.nhm.nlmsg_type = RTM_GETADDR;
+ req.nhm.nlmsg_seq = ++seq;
+ req.nhm.nlmsg_flags = NLM_F_REQUEST;
+ send(sock, &req, sizeof(req), 0);
+
+ struct {
+ struct nlmsghdr nhm;
+ struct ifaddrmsg ifa;
+ uint8_t buf[1024];
+ } dad_reply;
+ recv(sock, &dad_reply, sizeof(dad_reply), 0);
+
+ if (dad_reply.nhm.nlmsg_type != RTM_NEWADDR ||
+ (dad_reply.ifa.ifa_flags & IFA_F_DADFAILED)) {
+ syslog(LOG_WARNING, "Removing duplicate address %s", buf);
+ set_rtnetlink_addr(ifindex, addr, 0, 0);
+ return -EADDRNOTAVAIL;
+ }
+ return 0;
+}
--- /dev/null
+/**
+ * Copyright (C) 2012 Steven Barth <steven@midlink.org>
+ *
+ * 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
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <stdio.h>
+#include <resolv.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+#include "odhcp6c.h"
+
+static const char hexdigits[] = "0123456789abcdef";
+static const char hexvals[] = {
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -2, -1, -1, -2, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
+ -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+};
+
+
+
+static char *argv[4] = {NULL, NULL, NULL, NULL};
+
+
+int script_init(const char *path, const char *ifname)
+{
+ argv[0] = (char*)path;
+ argv[1] = (char*)ifname;
+ return 0;
+}
+
+
+ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src)
+{
+ size_t c;
+ for (c = 0; c < len && src[0] && src[1]; ++c) {
+ int8_t x = (int8_t)*src++;
+ int8_t y = (int8_t)*src++;
+ if (x < 0 || (x = hexvals[x]) < 0
+ || y < 0 || (y = hexvals[y]) < 0)
+ return -1;
+ dst[c] = x << 4 | y;
+ while (*src < 0 || (*src && hexvals[(uint8_t)*src] < 0))
+ src++;
+ }
+
+ return c;
+}
+
+
+void script_hexlify(char *dst, const uint8_t *src, size_t len) {
+ for (size_t i = 0; i < len; ++i) {
+ *dst++ = hexdigits[src[i] >> 4];
+ *dst++ = hexdigits[src[i] & 0x0f];
+ }
+ *dst = 0;
+}
+
+
+static void ipv6_to_env(const char *name,
+ const struct in6_addr *addr, size_t cnt)
+{
+ size_t buf_len = strlen(name);
+ char *buf = realloc(NULL, cnt * INET6_ADDRSTRLEN + buf_len + 2);
+ memcpy(buf, name, buf_len);
+ buf[buf_len++] = '=';
+ for (size_t i = 0; i < cnt; ++i) {
+ inet_ntop(AF_INET6, &addr[i], &buf[buf_len], INET6_ADDRSTRLEN);
+ buf_len += strlen(&buf[buf_len]);
+ buf[buf_len++] = ' ';
+ }
+ buf[buf_len - 1] = '\0';
+ putenv(buf);
+}
+
+
+static void fqdn_to_env(const char *name, const uint8_t *fqdn, size_t len)
+{
+ size_t buf_len = strlen(name);
+ const uint8_t *fqdn_end = fqdn + len;
+ char *buf = realloc(NULL, len + buf_len + 2);
+ memcpy(buf, name, buf_len);
+ buf[buf_len++] = '=';
+ int l = 1;
+ while (l > 0 && fqdn < fqdn_end) {
+ l = dn_expand(fqdn, &fqdn[len], fqdn, &buf[buf_len], len);
+ fqdn += l;
+ buf_len += strlen(&buf[buf_len]);
+ buf[buf_len++] = ' ';
+ }
+ buf[buf_len - 1] = '\0';
+ putenv(buf);
+}
+
+
+static void bin_to_env(uint8_t *opts, size_t len)
+{
+ uint8_t *oend = opts + len, *odata;
+ uint16_t otype, olen;
+ dhcpv6_for_each_option(opts, oend, otype, olen, odata) {
+ char *buf = realloc(NULL, 14 + (olen * 2));
+ size_t buf_len = 0;
+
+ snprintf(buf, 14, "OPTION_%hu=", otype);
+ buf_len += strlen(buf);
+
+ script_hexlify(&buf[buf_len], odata, olen);
+ putenv(buf);
+ }
+}
+
+
+static void prefix_to_env(const char *name, const uint8_t *fqdn, size_t len)
+{
+ size_t buf_len = strlen(name);
+ struct dhcpv6_ia_prefix *p = NULL;
+ char *buf = realloc(NULL, buf_len + 2 +
+ (len / sizeof(*p)) * (INET6_ADDRSTRLEN + 32));
+ memcpy(buf, name, buf_len);
+ buf[buf_len++] = '=';
+
+ uint16_t otype, olen;
+ uint8_t *odata;
+ dhcpv6_for_each_option(fqdn, &fqdn[len], otype, olen, odata) {
+ if (otype != DHCPV6_OPT_IA_PREFIX || olen + 4U < sizeof(*p))
+ continue;
+
+ p = (struct dhcpv6_ia_prefix*)&odata[-4];
+ inet_ntop(AF_INET6, &p->addr, &buf[buf_len], INET6_ADDRSTRLEN);
+ buf_len += strlen(&buf[buf_len]);
+ buf_len += snprintf(&buf[buf_len], 32, "/%hhu,%u,%u ",
+ p->prefix, ntohl(p->preferred),
+ ntohl(p->valid));
+ }
+ buf[buf_len - 1] = '\0';
+ putenv(buf);
+}
+
+
+void script_call(const char *status)
+{
+ size_t dns_len, search_len, custom_len;
+ struct in6_addr *dns = odhcp6c_get_state(STATE_DNS, &dns_len);
+ uint8_t *search = odhcp6c_get_state(STATE_SEARCH, &search_len);
+ uint8_t *custom = odhcp6c_get_state(STATE_CUSTOM_OPTS, &custom_len);
+
+ size_t prefix_len, lost_pd_len;
+ uint8_t *prefix = odhcp6c_get_state(STATE_IA_PD, &prefix_len);
+ uint8_t *lost_pd = odhcp6c_get_state(STATE_IA_PD_LOST, &lost_pd_len);
+
+ // Don't set environment before forking, because env is leaky.
+ if (fork() == 0) {
+ ipv6_to_env("RDNSS", dns, dns_len / sizeof(*dns));
+ fqdn_to_env("DOMAINS", search, search_len);
+ bin_to_env(custom, custom_len);
+ prefix_to_env("PREFIXES", prefix, prefix_len);
+ prefix_to_env("PREFIXES_LOST", lost_pd, lost_pd_len);
+
+ argv[2] = (char*)status;
+ execv(argv[0], argv);
+ _exit(128);
+ }
+
+ // Delete lost prefixes and user opts
+ odhcp6c_clear_state(STATE_IA_PD_LOST);
+ odhcp6c_clear_state(STATE_CUSTOM_OPTS);
+}
projects / odhcp6c.git / commitdiff