/**
- * Copyright (C) 2012 Steven Barth <steven@midlink.org>
+ * Copyright (C) 2012-2013 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
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
+#include <stddef.h>
#include <unistd.h>
#include <syslog.h>
#include <signal.h>
#include <net/if.h>
#include <sys/wait.h>
#include <sys/syscall.h>
+#include <arpa/inet.h>
#include "odhcp6c.h"
+#include "ra.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;
+static int urandom_fd = -1, allow_slaac_only = 0;
+static bool bound = false, release = true;
+static time_t last_update = 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";
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) {
+ enum odhcp6c_ia_mode ia_pd_mode = IA_MODE_TRY;
+ static struct in6_addr ifid = IN6ADDR_ANY_INIT;
+ int sol_timeout = 120;
+
+ 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) {
switch (c) {
- case 'R':
- reset = true;
+ case 'S':
+ allow_slaac_only = (optarg) ? atoi(optarg) : -1;
break;
case 'N':
- if (!strcmp(optarg, "force"))
+ if (!strcmp(optarg, "force")) {
ia_na_mode = IA_MODE_FORCE;
- else if (!strcmp(optarg, "none"))
+ allow_slaac_only = -1;
+ } else if (!strcmp(optarg, "none")) {
ia_na_mode = IA_MODE_NONE;
- else if (!strcmp(optarg, "try"))
+ } else if (!strcmp(optarg, "try")) {
ia_na_mode = IA_MODE_TRY;
- else
+ } else{
help = true;
+ }
break;
case 'P':
+ if (allow_slaac_only >= 0 && allow_slaac_only < 10)
+ allow_slaac_only = 10;
+
request_pd = strtoul(optarg, NULL, 10);
if (request_pd == 0)
request_pd = -1;
+
+ ia_pd_mode = IA_MODE_TRY;
+ break;
+
+ case 'F':
+ allow_slaac_only = -1;
+ ia_pd_mode = IA_MODE_FORCE;
break;
case 'c':
buf[0] = 0;
buf[1] = DHCPV6_OPT_CLIENTID;
buf[2] = 0;
- buf[4] = l;
+ buf[3] = l;
odhcp6c_add_state(STATE_CLIENT_ID, buf, l + 4);
} else {
help = true;
}
break;
+ case 'i':
+ if (inet_pton(AF_INET6, optarg, &ifid) != 1)
+ help = true;
+ break;
+
case 'r':
optpos = optarg;
while (optpos[0]) {
script = optarg;
break;
+ case 'k':
+ release = false;
+ break;
+
case 't':
- timeout = strtoul(optarg, NULL, 10);
+ sol_timeout = atoi(optarg);
+ break;
+
+ case 'e':
+ logopt |= LOG_PERROR;
break;
case 'd':
}
}
+ openlog("odhcp6c", logopt, LOG_DAEMON);
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(SIGIO, sighandler);
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 ((urandom_fd = open("/dev/urandom", O_CLOEXEC | O_RDONLY)) < 0 ||
+ init_dhcpv6(ifname, request_pd, sol_timeout) ||
+ ra_init(ifname, &ifid) || script_init(script, ifname)) {
+ syslog(LOG_ERR, "failed to initialize: %s", strerror(errno));
+ return 3;
}
if (daemonize) {
}
}
+ script_call("started");
+
while (do_signal != SIGTERM) { // Main logic
odhcp6c_clear_state(STATE_SERVER_ID);
- odhcp6c_clear_state(STATE_SERVER_CAND);
+ odhcp6c_clear_state(STATE_IA_NA);
odhcp6c_clear_state(STATE_IA_PD);
- odhcp6c_clear_state(STATE_IA_PD_LOST);
- dhcpv6_set_ia_na_mode(ia_na_mode);
+ odhcp6c_clear_state(STATE_SNTP_IP);
+ odhcp6c_clear_state(STATE_SNTP_FQDN);
+ odhcp6c_clear_state(STATE_SIP_IP);
+ odhcp6c_clear_state(STATE_SIP_FQDN);
+ dhcpv6_set_ia_mode(ia_na_mode, ia_pd_mode);
+ bound = false;
+
+ // Server candidates need deep-delete
+ size_t cand_len;
+ struct dhcpv6_server_cand *cand = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
+ for (size_t i = 0; i < cand_len / sizeof(*cand); ++i) {
+ free(cand[i].ia_na);
+ free(cand[i].ia_pd);
+ }
+ odhcp6c_clear_state(STATE_SERVER_CAND);
+
+ syslog(LOG_NOTICE, "(re)starting transaction on %s", ifname);
- alarm(timeout);
do_signal = 0;
int res = dhcpv6_request(DHCPV6_MSG_SOLICIT);
+ odhcp6c_signal_process();
- if (res < 0) {
+ 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);
+ odhcp6c_signal_process();
if (do_signal == SIGUSR1)
continue;
else if (res < 0)
else if (res > 0)
script_call("informed");
- alarm(0);
+ bound = true;
+ syslog(LOG_NOTICE, "entering stateless-mode on %s", ifname);
+
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)
+ if (dhcpv6_request(DHCPV6_MSG_REQUEST) <= 0)
continue;
+ odhcp6c_signal_process();
script_call("bound");
- alarm(0);
+ bound = true;
+ syslog(LOG_NOTICE, "entering stateful-mode on %s", ifname);
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");
-
+ odhcp6c_signal_process();
+ if (res > 0) {
+ script_call("updated");
continue;
}
r = dhcpv6_request(DHCPV6_MSG_REQUEST);
else
r = dhcpv6_request(DHCPV6_MSG_RENEW);
- if (r > 0) // Publish updates
+ odhcp6c_signal_process();
+ if (r > 0) { // Renew was succesfull
+ // 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_signal_process();
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) ||
+ 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)
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_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");
+ bound = false;
+ 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))
+ if (server_id_len > 0 && (ia_pd_len > 0 || ia_na_len > 0) && release)
dhcpv6_request(DHCPV6_MSG_RELEASE);
+
+ odhcp6c_clear_state(STATE_IA_NA);
+ odhcp6c_clear_state(STATE_IA_PD);
}
+ script_call("stopped");
return 0;
}
const char buf[] =
"Usage: odhcp6c [options] <interface>\n"
"\nFeature options:\n"
+ " -S <time> Wait at least <time> sec for a DHCP-server (0)\n"
" -N <mode> Mode for requesting addresses [try|force|none]\n"
" -P <length> Request IPv6-Prefix (0 = auto)\n"
+ " -F Force IPv6-Prefix\n"
" -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"
" -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
- " -t <timeout> Request timeout after which the script is called\n"
+ " -k Don't send a RELEASE when stopping\n"
+ " -t <seconds> Maximum timeout for DHCPv6-SOLICIT (120)\n"
"\nInvocation options:\n"
" -p <pidfile> Set pidfile (/var/run/6relayd.pid)\n"
" -d Daemonize\n"
+ " -e Write logmessages to stderr\n"
//" -v Increase logging verbosity\n"
" -h Show this help\n\n";
write(STDERR_FILENO, buf, sizeof(buf));
// Don't want to pull-in librt and libpthread just for a monotonic clock...
-uint64_t adhc6c_get_milli_time(void)
+uint64_t odhcp6c_get_milli_time(void)
{
struct timespec t = {0, 0};
syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &t);
{
if (len == 0)
return state_data[state] + state_len[state];
+ else if (state_len[state] + len > 1024)
+ return NULL;
- 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;
}
-bool odhcp6c_signal_is_pending(void)
+bool odhcp6c_signal_process(void)
{
+ if (do_signal == SIGIO) {
+ do_signal = 0;
+ bool ra_updated = ra_process();
+
+ 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);
+ }
+
return do_signal != 0;
}
}
-bool odhcp6c_commit_state(enum odhcp6c_state state, size_t old_len)
+void* odhcp6c_move_state(enum odhcp6c_state state, size_t *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);
+ *len = state_len[state];
+ void *data = state_data[state];
- memmove(old_data, new_data, new_len);
- odhcp6c_resize_state(state, -old_len);
+ state_len[state] = 0;
+ state_data[state] = NULL;
- return upd;
+ return data;
}
}
-static int sysctl_interface(const char *ifname, const char *option,
- const char *data)
+struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new)
+{
+ size_t len, cmplen = offsetof(struct odhcp6c_entry, target) + new->length / 8;
+ struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
+ struct odhcp6c_entry *x = NULL;
+
+ for (struct odhcp6c_entry *c = start; !x && c < &start[len/sizeof(*c)]; ++c)
+ if (!memcmp(c, new, cmplen))
+ return c;
+
+ return NULL;
+}
+
+
+bool odhcp6c_update_entry_safe(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe)
+{
+ size_t len;
+ struct odhcp6c_entry *x = odhcp6c_find_entry(state, new);
+ struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
+ bool changed = true;
+
+ if (x && x->valid > new->valid && new->valid < safe)
+ new->valid = safe;
+
+ if (new->valid > 0) {
+ if (x) {
+ if (new->valid >= x->valid && new->valid - x->valid < 60 &&
+ new->preferred >= x->preferred &&
+ new->preferred - x->preferred < 60 &&
+ x->class == new->class)
+ changed = false;
+ x->valid = new->valid;
+ x->preferred = new->preferred;
+ x->t1 = new->t1;
+ x->t2 = new->t2;
+ x->class = new->class;
+ } else {
+ odhcp6c_add_state(state, new, sizeof(*new));
+ }
+ } else if (x) {
+ odhcp6c_remove_state(state, (x - start) * sizeof(*x), sizeof(*x));
+ }
+ return changed;
+}
+
+
+bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new)
+{
+ return odhcp6c_update_entry_safe(state, new, 0);
+}
+
+
+static void odhcp6c_expire_list(enum odhcp6c_state state, uint32_t elapsed)
+{
+ size_t len;
+ struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
+ for (struct odhcp6c_entry *c = start; c < &start[len / sizeof(*c)]; ++c) {
+ if (c->t1 < elapsed)
+ c->t1 = 0;
+ else if (c->t1 != UINT32_MAX)
+ c->t1 -= elapsed;
+
+ if (c->t2 < elapsed)
+ c->t2 = 0;
+ else if (c->t2 != UINT32_MAX)
+ c->t2 -= elapsed;
+
+ if (c->preferred < elapsed)
+ c->preferred = 0;
+ else if (c->preferred != UINT32_MAX)
+ c->preferred -= elapsed;
+
+ if (c->valid < elapsed)
+ c->valid = 0;
+ else if (c->valid != UINT32_MAX)
+ c->valid -= elapsed;
+
+ if (!c->valid)
+ odhcp6c_remove_state(state, (c - start) * sizeof(*c), sizeof(*c));
+ }
+}
+
+
+void odhcp6c_expire(void)
{
- char pathbuf[64];
- const char *sysctl_pattern = "/proc/sys/net/ipv6/conf/%s/%s";
- snprintf(pathbuf, sizeof(pathbuf), sysctl_pattern, ifname, option);
+ time_t now = odhcp6c_get_milli_time() / 1000;
+ uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
+ last_update = now;
+
+ odhcp6c_expire_list(STATE_RA_PREFIX, elapsed);
+ odhcp6c_expire_list(STATE_RA_ROUTE, elapsed);
+ odhcp6c_expire_list(STATE_RA_DNS, elapsed);
+ odhcp6c_expire_list(STATE_IA_NA, elapsed);
+ odhcp6c_expire_list(STATE_IA_PD, elapsed);
+}
- int fd = open(pathbuf, O_WRONLY);
- int written = write(fd, data, strlen(data));
- close(fd);
- return (written > 0) ? 0 : -1;
+uint32_t odhcp6c_elapsed(void)
+{
+ return odhcp6c_get_milli_time() / 1000 - last_update;
}
+void odhcp6c_random(void *buf, size_t len)
+{
+ read(urandom_fd, buf, len);
+}
+
+bool odhcp6c_is_bound(void)
+{
+ return bound;
+}
+
static void sighandler(int signal)
{
if (signal == SIGCHLD)
do_signal = SIGUSR1;
else if (signal == SIGUSR2)
do_signal = SIGUSR2;
- else if (signal == SIGALRM)
- do_signal = SIGALRM;
+ else if (signal == SIGIO)
+ do_signal = SIGIO;
else
do_signal = SIGTERM;
}
projects / odhcp6c.git / blobdiff