#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <netinet6/in6_var.h>
#include <arpa/inet.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <event.h>
#include <ifaddrs.h>
#include <imsg.h>
#include <netdb.h>
#include <pwd.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <uuid.h>
#include "log.h"
#include "dhcp6leased.h"
#include "frontend.h"
#include "engine.h"
#include "control.h"
enum dhcp6leased_process {
PROC_MAIN,
PROC_ENGINE,
PROC_FRONTEND
};
__dead void usage(void);
__dead void main_shutdown(void);
void main_sig_handler(int, short, void *);
static pid_t start_child(enum dhcp6leased_process, char *, int, int, int);
void main_dispatch_frontend(int, short, void *);
void main_dispatch_engine(int, short, void *);
void open_udpsock(uint32_t);
void configure_address(struct imsg_configure_address *);
void deconfigure_address(struct imsg_configure_address *);
void configure_reject_route(struct imsg_configure_reject_route *, uint8_t);
void read_lease_file(struct imsg_ifinfo *);
uint8_t *get_uuid(void);
void write_lease_file(struct imsg_lease_info *);
int main_imsg_send_ipc_sockets(struct imsgbuf *, struct imsgbuf *);
int main_imsg_compose_frontend(int, int, void *, uint16_t);
int main_imsg_compose_engine(int, int, void *, uint16_t);
int main_imsg_send_config(struct dhcp6leased_conf *);
int main_reload(void);
static struct imsgev *iev_frontend;
static struct imsgev *iev_engine;
struct dhcp6leased_conf *main_conf;
const char default_conffile[] = _PATH_CONF_FILE;
const char *conffile = default_conffile;
pid_t frontend_pid;
pid_t engine_pid;
int routesock, ioctl_sock, rtm_seq, no_lease_files;
void
main_sig_handler(int sig, short event, void *arg)
{
switch (sig) {
case SIGTERM:
case SIGINT:
main_shutdown();
case SIGHUP:
if (main_reload() == -1)
log_warnx("configuration reload failed");
else
log_debug("configuration reloaded");
break;
default:
fatalx("unexpected signal");
}
}
__dead void
usage(void)
{
extern char *__progname;
fprintf(stderr, "usage: %s [-dnv] [-f file] [-s socket]\n",
__progname);
exit(1);
}
int
main(int argc, char *argv[])
{
struct event ev_sigint, ev_sigterm, ev_sighup;
int ch;
int debug = 0, engine_flag = 0, frontend_flag = 0;
int verbose = 0, no_action = 0;
char *saved_argv0;
int pipe_main2frontend[2];
int pipe_main2engine[2];
int frontend_routesock, rtfilter, lockfd;
int rtable_any = RTABLE_ANY;
char *csock = _PATH_CTRL_SOCKET;
int control_fd;
uint8_t *uuid;
log_init(1, LOG_DAEMON);
log_setverbose(1);
saved_argv0 = argv[0];
if (saved_argv0 == NULL)
saved_argv0 = "dhcp6leased";
while ((ch = getopt(argc, argv, "dEFf:ns:v")) != -1) {
switch (ch) {
case 'd':
debug = 1;
break;
case 'E':
engine_flag = 1;
break;
case 'F':
frontend_flag = 1;
break;
case 'f':
conffile = optarg;
break;
case 'n':
no_action = 1;
break;
case 's':
csock = optarg;
break;
case 'v':
verbose++;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc > 0 || (engine_flag && frontend_flag))
usage();
if (engine_flag)
engine(debug, verbose);
else if (frontend_flag)
frontend(debug, verbose);
if ((main_conf = parse_config(conffile)) == NULL)
exit(1);
if (no_action) {
if (verbose)
print_config(main_conf, verbose);
else
fprintf(stderr, "configuration OK\n");
exit(0);
}
if (geteuid())
errx(1, "need root privileges");
lockfd = open(_PATH_LOCKFILE, O_CREAT|O_RDWR|O_EXLOCK|O_NONBLOCK, 0600);
if (lockfd == -1) {
if (errno == EAGAIN)
errx(1, "already running");
err(1, "%s", _PATH_LOCKFILE);
}
if (getpwnam(DHCP6LEASED_USER) == NULL)
errx(1, "unknown user %s", DHCP6LEASED_USER);
log_init(debug, LOG_DAEMON);
log_setverbose(verbose);
if (!debug)
daemon(0, 0);
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
PF_UNSPEC, pipe_main2frontend) == -1)
fatal("main2frontend socketpair");
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
PF_UNSPEC, pipe_main2engine) == -1)
fatal("main2engine socketpair");
engine_pid = start_child(PROC_ENGINE, saved_argv0, pipe_main2engine[1],
debug, verbose);
frontend_pid = start_child(PROC_FRONTEND, saved_argv0,
pipe_main2frontend[1], debug, verbose);
log_procinit("main");
if ((routesock = socket(AF_ROUTE, SOCK_RAW | SOCK_CLOEXEC |
SOCK_NONBLOCK, AF_INET)) == -1)
fatal("route socket");
shutdown(routesock, SHUT_RD);
event_init();
signal_set(&ev_sigint, SIGINT, main_sig_handler, NULL);
signal_set(&ev_sigterm, SIGTERM, main_sig_handler, NULL);
signal_set(&ev_sighup, SIGHUP, main_sig_handler, NULL);
signal_add(&ev_sigint, NULL);
signal_add(&ev_sigterm, NULL);
signal_add(&ev_sighup, NULL);
signal(SIGPIPE, SIG_IGN);
if ((iev_frontend = malloc(sizeof(struct imsgev))) == NULL ||
(iev_engine = malloc(sizeof(struct imsgev))) == NULL)
fatal(NULL);
if (imsgbuf_init(&iev_frontend->ibuf, pipe_main2frontend[0]) == -1)
fatal(NULL);
imsgbuf_allow_fdpass(&iev_frontend->ibuf);
iev_frontend->handler = main_dispatch_frontend;
if (imsgbuf_init(&iev_engine->ibuf, pipe_main2engine[0]) == -1)
fatal(NULL);
imsgbuf_allow_fdpass(&iev_engine->ibuf);
iev_engine->handler = main_dispatch_engine;
iev_frontend->events = EV_READ;
event_set(&iev_frontend->ev, iev_frontend->ibuf.fd,
iev_frontend->events, iev_frontend->handler, iev_frontend);
event_add(&iev_frontend->ev, NULL);
iev_engine->events = EV_READ;
event_set(&iev_engine->ev, iev_engine->ibuf.fd, iev_engine->events,
iev_engine->handler, iev_engine);
event_add(&iev_engine->ev, NULL);
if (main_imsg_send_ipc_sockets(&iev_frontend->ibuf, &iev_engine->ibuf))
fatal("could not establish imsg links");
if ((ioctl_sock = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0)) == -1)
fatal("socket");
if ((frontend_routesock = socket(AF_ROUTE, SOCK_RAW | SOCK_CLOEXEC,
AF_INET)) == -1)
fatal("route socket");
rtfilter = ROUTE_FILTER(RTM_IFINFO) | ROUTE_FILTER(RTM_IFANNOUNCE);
if (setsockopt(frontend_routesock, AF_ROUTE, ROUTE_MSGFILTER,
&rtfilter, sizeof(rtfilter)) == -1)
fatal("setsockopt(ROUTE_MSGFILTER)");
if (setsockopt(frontend_routesock, AF_ROUTE, ROUTE_TABLEFILTER,
&rtable_any, sizeof(rtable_any)) == -1)
fatal("setsockopt(ROUTE_TABLEFILTER)");
uuid = get_uuid();
if ((control_fd = control_init(csock)) == -1)
warnx("control socket setup failed");
if (unveil(conffile, "r") == -1)
fatal("unveil %s", conffile);
if (unveil(_PATH_LEASE, "rwc") == -1) {
no_lease_files = 1;
log_warn("disabling lease files, unveil " _PATH_LEASE);
}
if (unveil(NULL, NULL) == -1)
fatal("unveil");
if (pledge("stdio inet rpath wpath cpath fattr sendfd wroute", NULL)
== -1)
fatal("pledge");
main_imsg_compose_frontend(IMSG_ROUTESOCK, frontend_routesock, NULL, 0);
main_imsg_compose_frontend(IMSG_UUID, -1, uuid, UUID_SIZE);
main_imsg_compose_engine(IMSG_UUID, -1, uuid, UUID_SIZE);
if (control_fd != -1)
main_imsg_compose_frontend(IMSG_CONTROLFD, control_fd, NULL, 0);
main_imsg_send_config(main_conf);
main_imsg_compose_frontend(IMSG_STARTUP, -1, NULL, 0);
event_dispatch();
main_shutdown();
return (0);
}
__dead void
main_shutdown(void)
{
pid_t pid;
int status;
imsgbuf_clear(&iev_frontend->ibuf);
close(iev_frontend->ibuf.fd);
imsgbuf_clear(&iev_engine->ibuf);
close(iev_engine->ibuf.fd);
config_clear(main_conf);
log_debug("waiting for children to terminate");
do {
pid = wait(&status);
if (pid == -1) {
if (errno != EINTR && errno != ECHILD)
fatal("wait");
} else if (WIFSIGNALED(status))
log_warnx("%s terminated; signal %d",
(pid == engine_pid) ? "engine" :
"frontend", WTERMSIG(status));
} while (pid != -1 || (pid == -1 && errno == EINTR));
free(iev_frontend);
free(iev_engine);
log_info("terminating");
exit(0);
}
static pid_t
start_child(enum dhcp6leased_process p, char *argv0, int fd, int debug, int
verbose)
{
char *argv[7];
int argc = 0;
pid_t pid;
switch (pid = fork()) {
case -1:
fatal("cannot fork");
case 0:
break;
default:
close(fd);
return (pid);
}
if (fd != 3) {
if (dup2(fd, 3) == -1)
fatal("cannot setup imsg fd");
} else if (fcntl(fd, F_SETFD, 0) == -1)
fatal("cannot setup imsg fd");
argv[argc++] = argv0;
switch (p) {
case PROC_MAIN:
fatalx("Can not start main process");
case PROC_ENGINE:
argv[argc++] = "-E";
break;
case PROC_FRONTEND:
argv[argc++] = "-F";
break;
}
if (debug)
argv[argc++] = "-d";
if (verbose)
argv[argc++] = "-v";
if (verbose > 1)
argv[argc++] = "-v";
argv[argc++] = NULL;
execvp(argv0, argv);
fatal("execvp");
}
void
main_dispatch_frontend(int fd, short event, void *bula)
{
struct imsgev *iev = bula;
struct imsgbuf *ibuf;
struct imsg imsg;
struct imsg_ifinfo imsg_ifinfo;
ssize_t n;
int shut = 0;
uint32_t if_index;
int verbose;
ibuf = &iev->ibuf;
if (event & EV_READ) {
if ((n = imsgbuf_read(ibuf)) == -1)
fatal("imsgbuf_read error");
if (n == 0)
shut = 1;
}
if (event & EV_WRITE) {
if (imsgbuf_write(ibuf) == -1) {
if (errno == EPIPE)
shut = 1;
else
fatal("imsgbuf_write");
}
}
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("imsg_get");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_OPEN_UDPSOCK:
if (IMSG_DATA_SIZE(imsg) != sizeof(if_index))
fatalx("%s: IMSG_OPEN_UDPSOCK wrong length: "
"%lu", __func__, IMSG_DATA_SIZE(imsg));
memcpy(&if_index, imsg.data, sizeof(if_index));
open_udpsock(if_index);
break;
case IMSG_CTL_RELOAD:
if (main_reload() == -1)
log_warnx("configuration reload failed");
else
log_warnx("configuration reloaded");
break;
case IMSG_CTL_LOG_VERBOSE:
if (IMSG_DATA_SIZE(imsg) != sizeof(verbose))
fatalx("%s: IMSG_CTL_LOG_VERBOSE wrong length: "
"%lu", __func__, IMSG_DATA_SIZE(imsg));
memcpy(&verbose, imsg.data, sizeof(verbose));
log_setverbose(verbose);
break;
case IMSG_UPDATE_IF:
if (IMSG_DATA_SIZE(imsg) != sizeof(imsg_ifinfo))
fatalx("%s: IMSG_UPDATE_IF wrong length: %lu",
__func__, IMSG_DATA_SIZE(imsg));
memcpy(&imsg_ifinfo, imsg.data, sizeof(imsg_ifinfo));
read_lease_file(&imsg_ifinfo);
main_imsg_compose_engine(IMSG_UPDATE_IF, -1,
&imsg_ifinfo, sizeof(imsg_ifinfo));
break;
default:
log_debug("%s: error handling imsg %d", __func__,
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
if (!shut)
imsg_event_add(iev);
else {
event_del(&iev->ev);
event_loopexit(NULL);
}
}
void
main_dispatch_engine(int fd, short event, void *bula)
{
struct imsgev *iev = bula;
struct imsgbuf *ibuf;
struct imsg imsg;
ssize_t n;
int shut = 0;
ibuf = &iev->ibuf;
if (event & EV_READ) {
if ((n = imsgbuf_read(ibuf)) == -1 && errno != EAGAIN)
fatal("imsgbuf_read error");
if (n == 0)
shut = 1;
}
if (event & EV_WRITE) {
if (imsgbuf_write(ibuf) == -1) {
if (errno == EPIPE)
shut = 1;
else
fatal("imsgbuf_write");
}
}
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("imsg_get");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_CONFIGURE_ADDRESS: {
struct imsg_configure_address imsg_configure_address;
if (IMSG_DATA_SIZE(imsg) !=
sizeof(imsg_configure_address))
fatalx("%s: IMSG_CONFIGURE_ADDRESS wrong "
"length: %lu", __func__,
IMSG_DATA_SIZE(imsg));
memcpy(&imsg_configure_address, imsg.data,
sizeof(imsg_configure_address));
configure_address(&imsg_configure_address);
break;
}
case IMSG_DECONFIGURE_ADDRESS: {
struct imsg_configure_address imsg_configure_address;
if (IMSG_DATA_SIZE(imsg) !=
sizeof(imsg_configure_address))
fatalx("%s: IMSG_CONFIGURE_ADDRESS wrong "
"length: %lu", __func__,
IMSG_DATA_SIZE(imsg));
memcpy(&imsg_configure_address, imsg.data,
sizeof(imsg_configure_address));
deconfigure_address(&imsg_configure_address);
break;
}
case IMSG_CONFIGURE_REJECT_ROUTE: {
struct imsg_configure_reject_route imsg_crr;
if (IMSG_DATA_SIZE(imsg) != sizeof(imsg_crr))
fatalx("%s: IMSG_CONFIGURE_REJECT_ROUTE wrong "
"length: %lu", __func__,
IMSG_DATA_SIZE(imsg));
memcpy(&imsg_crr, imsg.data, sizeof(imsg_crr));
configure_reject_route(&imsg_crr, RTM_ADD);
break;
}
case IMSG_DECONFIGURE_REJECT_ROUTE: {
struct imsg_configure_reject_route imsg_crr;
if (IMSG_DATA_SIZE(imsg) != sizeof(imsg_crr))
fatalx("%s: IMSG_CONFIGURE_REJECT_ROUTE wrong "
"length: %lu", __func__,
IMSG_DATA_SIZE(imsg));
memcpy(&imsg_crr, imsg.data, sizeof(imsg_crr));
configure_reject_route(&imsg_crr, RTM_DELETE);
break;
}
case IMSG_WRITE_LEASE: {
struct imsg_lease_info imsg_lease_info;
if (IMSG_DATA_SIZE(imsg) !=
sizeof(imsg_lease_info))
fatalx("%s: IMSG_WRITE_LEASE wrong length: %lu",
__func__, IMSG_DATA_SIZE(imsg));
memcpy(&imsg_lease_info, imsg.data,
sizeof(imsg_lease_info));
write_lease_file(&imsg_lease_info);
break;
}
default:
log_debug("%s: error handling imsg %d", __func__,
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
if (!shut)
imsg_event_add(iev);
else {
event_del(&iev->ev);
event_loopexit(NULL);
}
}
int
main_imsg_compose_frontend(int type, int fd, void *data, uint16_t datalen)
{
if (iev_frontend)
return (imsg_compose_event(iev_frontend, type, 0, 0, fd, data,
datalen));
else
return (-1);
}
int
main_imsg_compose_engine(int type, int fd, void *data, uint16_t datalen)
{
if (iev_engine)
return(imsg_compose_event(iev_engine, type, 0, 0, fd, data,
datalen));
else
return (-1);
}
void
imsg_event_add(struct imsgev *iev)
{
iev->events = EV_READ;
if (imsgbuf_queuelen(&iev->ibuf) > 0)
iev->events |= EV_WRITE;
event_del(&iev->ev);
event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);
event_add(&iev->ev, NULL);
}
int
imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
pid_t pid, int fd, void *data, uint16_t datalen)
{
int ret;
if ((ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data,
datalen)) != -1)
imsg_event_add(iev);
return (ret);
}
int
main_imsg_send_ipc_sockets(struct imsgbuf *frontend_buf,
struct imsgbuf *engine_buf)
{
int pipe_frontend2engine[2];
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
PF_UNSPEC, pipe_frontend2engine) == -1)
return (-1);
if (imsg_compose(frontend_buf, IMSG_SOCKET_IPC, 0, 0,
pipe_frontend2engine[0], NULL, 0) == -1)
return (-1);
imsgbuf_flush(frontend_buf);
if (imsg_compose(engine_buf, IMSG_SOCKET_IPC, 0, 0,
pipe_frontend2engine[1], NULL, 0) == -1)
return (-1);
imsgbuf_flush(engine_buf);
return (0);
}
int
main_reload(void)
{
struct dhcp6leased_conf *xconf;
if ((xconf = parse_config(conffile)) == NULL)
return (-1);
if (main_imsg_send_config(xconf) == -1)
return (-1);
merge_config(main_conf, xconf);
return (0);
}
int
main_imsg_send_config(struct dhcp6leased_conf *xconf)
{
struct iface_conf *iface_conf;
struct iface_ia_conf *ia_conf;
struct iface_pd_conf *pd_conf;
main_imsg_compose_frontend(IMSG_RECONF_CONF, -1, xconf, sizeof(*xconf));
main_imsg_compose_engine(IMSG_RECONF_CONF, -1, xconf, sizeof(*xconf));
SIMPLEQ_FOREACH(iface_conf, &xconf->iface_list, entry) {
main_imsg_compose_frontend(IMSG_RECONF_IFACE, -1, iface_conf,
sizeof(*iface_conf));
main_imsg_compose_engine(IMSG_RECONF_IFACE, -1, iface_conf,
sizeof(*iface_conf));
SIMPLEQ_FOREACH(ia_conf, &iface_conf->iface_ia_list,
entry) {
main_imsg_compose_frontend(IMSG_RECONF_IFACE_IA, -1,
ia_conf, sizeof(*ia_conf));
main_imsg_compose_engine(IMSG_RECONF_IFACE_IA, -1,
ia_conf, sizeof(*ia_conf));
SIMPLEQ_FOREACH(pd_conf, &ia_conf->iface_pd_list,
entry) {
main_imsg_compose_frontend(IMSG_RECONF_IFACE_PD,
-1, pd_conf, sizeof(*pd_conf));
main_imsg_compose_engine(IMSG_RECONF_IFACE_PD,
-1, pd_conf, sizeof(*pd_conf));
}
main_imsg_compose_frontend(IMSG_RECONF_IFACE_IA_END,
-1, NULL, 0);
main_imsg_compose_engine(IMSG_RECONF_IFACE_IA_END,
-1, NULL, 0);
}
main_imsg_compose_frontend(IMSG_RECONF_IFACE_END, -1, NULL, 0);
main_imsg_compose_engine(IMSG_RECONF_IFACE_END, -1, NULL, 0);
}
main_imsg_compose_frontend(IMSG_RECONF_END, -1, NULL, 0);
main_imsg_compose_engine(IMSG_RECONF_END, -1, NULL, 0);
return (0);
}
void
configure_address(struct imsg_configure_address *address)
{
struct in6_aliasreq in6_addreq;
time_t t;
char *if_name;
memset(&in6_addreq, 0, sizeof(in6_addreq));
if_name = if_indextoname(address->if_index, in6_addreq.ifra_name);
if (if_name == NULL) {
log_warnx("%s: cannot find interface %d", __func__,
address->if_index);
return;
}
memcpy(&in6_addreq.ifra_addr, &address->addr,
sizeof(in6_addreq.ifra_addr));
memcpy(&in6_addreq.ifra_prefixmask.sin6_addr, &address->mask,
sizeof(in6_addreq.ifra_prefixmask.sin6_addr));
in6_addreq.ifra_prefixmask.sin6_family = AF_INET6;
in6_addreq.ifra_prefixmask.sin6_len =
sizeof(in6_addreq.ifra_prefixmask);
t = time(NULL);
in6_addreq.ifra_lifetime.ia6t_expire = t + address->vltime;
in6_addreq.ifra_lifetime.ia6t_vltime = address->vltime;
in6_addreq.ifra_lifetime.ia6t_preferred = t + address->pltime;
in6_addreq.ifra_lifetime.ia6t_pltime = address->pltime;
log_debug("%s: %s", __func__, if_name);
if (ioctl(ioctl_sock, SIOCAIFADDR_IN6, &in6_addreq) == -1)
log_warn("SIOCAIFADDR_IN6");
}
void
deconfigure_address(struct imsg_configure_address *address)
{
struct in6_ifreq in6_ridreq;
char *if_name;
memset(&in6_ridreq, 0, sizeof(in6_ridreq));
if_name = if_indextoname(address->if_index, in6_ridreq.ifr_name);
if (if_name == NULL) {
log_warnx("%s: cannot find interface %d", __func__,
address->if_index);
return;
}
memcpy(&in6_ridreq.ifr_addr, &address->addr,
sizeof(in6_ridreq.ifr_addr));
log_debug("%s: %s", __func__, if_name);
if (ioctl(ioctl_sock, SIOCDIFADDR_IN6, &in6_ridreq) == -1 &&
errno != EADDRNOTAVAIL)
log_warn("%s: cannot remove address", __func__);
}
#define ROUNDUP(a) \
(((a) & (sizeof(long) - 1)) ? (1 + ((a) | (sizeof(long) - 1))) : (a))
void
configure_reject_route(struct imsg_configure_reject_route *reject_route,
uint8_t rtm_type)
{
struct rt_msghdr rtm;
struct sockaddr_rtlabel rl;
struct sockaddr_in6 dst, gw, mask;
struct iovec iov[10];
long pad = 0;
int iovcnt = 0, padlen;
memset(&rtm, 0, sizeof(rtm));
rtm.rtm_version = RTM_VERSION;
rtm.rtm_type = rtm_type;
rtm.rtm_msglen = sizeof(rtm);
rtm.rtm_tableid = reject_route->rdomain;
rtm.rtm_index = reject_route->if_index;
rtm.rtm_seq = ++rtm_seq;
rtm.rtm_priority = RTP_DEFAULT;
rtm.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK | RTA_LABEL;
rtm.rtm_flags = RTF_UP | RTF_REJECT | RTF_GATEWAY | RTF_STATIC;
iov[iovcnt].iov_base = &rtm;
iov[iovcnt++].iov_len = sizeof(rtm);
memset(&dst, 0, sizeof(dst));
dst.sin6_family = AF_INET6;
dst.sin6_len = sizeof(struct sockaddr_in6);
memcpy(&dst.sin6_addr, &reject_route->prefix, sizeof(dst.sin6_addr));
iov[iovcnt].iov_base = &dst;
iov[iovcnt++].iov_len = sizeof(dst);
rtm.rtm_msglen += sizeof(dst);
padlen = ROUNDUP(sizeof(dst)) - sizeof(dst);
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
memset(&gw, 0, sizeof(gw));
gw.sin6_family = AF_INET6;
gw.sin6_len = sizeof(struct sockaddr_in6);
memcpy(&gw.sin6_addr, &in6addr_loopback, sizeof(gw.sin6_addr));
iov[iovcnt].iov_base = &gw;
iov[iovcnt++].iov_len = sizeof(gw);
rtm.rtm_msglen += sizeof(gw);
padlen = ROUNDUP(sizeof(gw)) - sizeof(gw);
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
memset(&mask, 0, sizeof(mask));
mask.sin6_family = AF_INET6;
mask.sin6_len = sizeof(struct sockaddr_in6);
memcpy(&mask.sin6_addr, &reject_route->mask, sizeof(mask.sin6_addr));
iov[iovcnt].iov_base = &mask;
iov[iovcnt++].iov_len = sizeof(mask);
rtm.rtm_msglen += sizeof(mask);
padlen = ROUNDUP(sizeof(mask)) - sizeof(mask);
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
memset(&rl, 0, sizeof(rl));
rl.sr_len = sizeof(rl);
rl.sr_family = AF_UNSPEC;
(void)snprintf(rl.sr_label, sizeof(rl.sr_label), "%s",
DHCP6LEASED_RTA_LABEL);
iov[iovcnt].iov_base = &rl;
iov[iovcnt++].iov_len = sizeof(rl);
rtm.rtm_msglen += sizeof(rl);
padlen = ROUNDUP(sizeof(rl)) - sizeof(rl);
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
if (writev(routesock, iov, iovcnt) == -1) {
if (errno != EEXIST)
log_warn("failed to send route message");
}
}
const char*
sin6_to_str(struct sockaddr_in6 *sin6)
{
static char hbuf[NI_MAXHOST];
int error;
error = getnameinfo((struct sockaddr *)sin6, sin6->sin6_len, hbuf,
sizeof(hbuf), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV);
if (error) {
log_warnx("%s", gai_strerror(error));
strlcpy(hbuf, "unknown", sizeof(hbuf));
}
return hbuf;
}
void
open_udpsock(uint32_t if_index)
{
struct ifaddrs *ifap, *ifa;
struct sockaddr_in6 *sin6 = NULL;
int udpsock = -1, rdomain = -1, opt = 1;
char if_name[IF_NAMESIZE];
if (if_indextoname(if_index, if_name) == NULL) {
log_warnx("%s: cannot find interface %d", __func__, if_index);
return;
}
if (getifaddrs(&ifap) != 0)
fatal("getifaddrs");
for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
if (strcmp(if_name, ifa->ifa_name) != 0)
continue;
if (ifa->ifa_addr == NULL)
continue;
switch (ifa->ifa_addr->sa_family) {
case AF_LINK: {
struct if_data *if_data;
if_data = (struct if_data *)ifa->ifa_data;
rdomain = if_data->ifi_rdomain;
break;
}
case AF_INET6: {
struct sockaddr_in6 *s6;
s6 = (struct sockaddr_in6 *)ifa->ifa_addr;
#ifdef __KAME__
if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr) &&
s6->sin6_scope_id == 0) {
s6->sin6_scope_id = ntohs(*(u_int16_t *)
&s6->sin6_addr.s6_addr[2]);
s6->sin6_addr.s6_addr[2] =
s6->sin6_addr.s6_addr[3] = 0;
}
#endif
if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr))
sin6 = s6;
break;
}
default:
break;
}
}
if (sin6 == NULL) {
log_warnx("%s: missing link-local address on %s", __func__,
if_name);
goto out;
}
if (rdomain == -1) {
log_warnx("%s: cannot find rdomain for %s", __func__,
if_name);
goto out;
}
sin6->sin6_port = htons(CLIENT_PORT);
log_debug("%s: %s rdomain: %d", __func__, sin6_to_str(sin6),
rdomain);
if ((udpsock = socket(AF_INET6, SOCK_DGRAM, 0)) == -1) {
log_warn("socket");
goto out;
}
if (setsockopt(udpsock, SOL_SOCKET, SO_REUSEADDR, &opt,
sizeof(opt)) == -1)
log_warn("setting SO_REUSEADDR on socket");
if (setsockopt(udpsock, SOL_SOCKET, SO_RTABLE, &rdomain,
sizeof(rdomain)) == -1) {
log_warn("setsockopt SO_RTABLE");
close(udpsock);
goto out;
}
if (bind(udpsock, (struct sockaddr *)sin6, sizeof(*sin6)) == -1) {
close(udpsock);
goto out;
}
main_imsg_compose_frontend(IMSG_UDPSOCK, udpsock, &if_index,
sizeof(if_index));
out:
freeifaddrs(ifap);
}
void
write_lease_file(struct imsg_lease_info *imsg_lease_info)
{
struct iface_conf *iface_conf;
uint32_t i;
int len, fd, rem;
char if_name[IF_NAMESIZE];
char lease_buf[LEASE_SIZE];
char lease_file_buf[sizeof(_PATH_LEASE) +
IF_NAMESIZE];
char tmpl[] = _PATH_LEASE"XXXXXXXXXX";
char ntopbuf[INET6_ADDRSTRLEN];
char *p;
if (no_lease_files)
return;
if (if_indextoname(imsg_lease_info->if_index, if_name) == NULL) {
log_warnx("%s: cannot find interface %d", __func__,
imsg_lease_info->if_index);
return;
}
if ((iface_conf = find_iface_conf(&main_conf->iface_list, if_name))
== NULL) {
log_debug("%s: no interface configuration for %s", __func__,
if_name);
return;
}
len = snprintf(lease_file_buf, sizeof(lease_file_buf), "%s%s",
_PATH_LEASE, if_name);
if (len == -1 || (size_t) len >= sizeof(lease_file_buf)) {
log_warnx("%s: failed to encode lease path for %s", __func__,
if_name);
return;
}
p = lease_buf;
rem = sizeof(lease_buf);
for (i = 0; i < iface_conf->ia_count; i++) {
if (imsg_lease_info->pds[i].prefix_len == 0)
continue;
len = snprintf(p, rem, "%s%d %s %d\n", LEASE_IA_PD_PREFIX,
i, inet_ntop(AF_INET6, &imsg_lease_info->pds[i].prefix,
ntopbuf, INET6_ADDRSTRLEN),
imsg_lease_info->pds[i].prefix_len);
if (len == -1 || len >= rem) {
log_warnx("%s: failed to encode lease for %s", __func__,
if_name);
return;
}
p += len;
rem -= len;
}
len = sizeof(lease_buf) - rem;
if ((fd = mkstemp(tmpl)) == -1) {
log_warn("%s: mkstemp", __func__);
return;
}
if (write(fd, lease_buf, len) < len)
goto err;
if (fchmod(fd, 0644) == -1)
goto err;
if (close(fd) == -1)
goto err;
fd = -1;
if (rename(tmpl, lease_file_buf) == -1)
goto err;
return;
err:
log_warn("%s", __func__);
if (fd != -1)
close(fd);
unlink(tmpl);
}
void
read_lease_file(struct imsg_ifinfo *imsg_ifinfo)
{
int len;
char if_name[IF_NAMESIZE];
char lease_file_buf[sizeof(_PATH_LEASE) + IF_NAMESIZE];
if (no_lease_files)
return;
memset(imsg_ifinfo->pds, 0, sizeof(imsg_ifinfo->pds));
if (if_indextoname(imsg_ifinfo->if_index, if_name) == NULL) {
log_warnx("%s: cannot find interface %d", __func__,
imsg_ifinfo->if_index);
return;
}
len = snprintf(lease_file_buf, sizeof(lease_file_buf), "%s%s",
_PATH_LEASE, if_name);
if ( len == -1 || (size_t) len >= sizeof(lease_file_buf)) {
log_warnx("%s: failed to encode lease path for %s", __func__,
if_name);
return;
}
parse_lease(lease_file_buf, imsg_ifinfo);
if (log_getverbose() > 1) {
int i;
char ntopbuf[INET6_ADDRSTRLEN];
for (i = 0; i < MAX_IA; i++) {
if (imsg_ifinfo->pds[i].prefix_len == 0)
continue;
log_debug("%s: %s: %d %s/%d", __func__, if_name, i,
inet_ntop(AF_INET6, &imsg_ifinfo->pds[i].prefix,
ntopbuf, INET6_ADDRSTRLEN),
imsg_ifinfo->pds[i].prefix_len);
}
}
}
void
merge_config(struct dhcp6leased_conf *conf, struct dhcp6leased_conf *xconf)
{
struct iface_conf *iface_conf;
struct iface_ia_conf *ia_conf;
struct iface_pd_conf *pd_conf;
while ((iface_conf = SIMPLEQ_FIRST(&conf->iface_list)) != NULL) {
SIMPLEQ_REMOVE_HEAD(&conf->iface_list, entry);
while ((ia_conf =
SIMPLEQ_FIRST(&iface_conf->iface_ia_list)) != NULL) {
SIMPLEQ_REMOVE_HEAD(&iface_conf->iface_ia_list,
entry);
while ((pd_conf =
SIMPLEQ_FIRST(&ia_conf->iface_pd_list)) != NULL) {
SIMPLEQ_REMOVE_HEAD(&ia_conf->iface_pd_list,
entry);
free(pd_conf);
}
free(ia_conf);
}
free(iface_conf);
}
conf->rapid_commit = xconf->rapid_commit;
SIMPLEQ_CONCAT(&conf->iface_list, &xconf->iface_list);
free(xconf);
}
struct dhcp6leased_conf *
config_new_empty(void)
{
struct dhcp6leased_conf *xconf;
xconf = calloc(1, sizeof(*xconf));
if (xconf == NULL)
fatal(NULL);
SIMPLEQ_INIT(&xconf->iface_list);
return (xconf);
}
void
config_clear(struct dhcp6leased_conf *conf)
{
struct dhcp6leased_conf *xconf;
xconf = config_new_empty();
merge_config(conf, xconf);
free(conf);
}
uint8_t*
get_uuid(void) {
static uint8_t uuid_buf[UUID_SIZE];
uuid_t uuid;
uint32_t status;
int fd, len;
char *str;
char strbuf[UUID_STR_SIZE];
char tmpl[] = _PATH_UUID"XXXXXXXXXX";
if ((fd = open(_PATH_UUID, O_RDONLY)) == -1) {
gen:
uuid_create(&uuid, NULL);
uuid_to_string(&uuid, &str, &status);
if (status != uuid_s_ok)
fatalx("failed to generate uuid string representation");
len = snprintf(strbuf, sizeof(strbuf), "%s\n", str);
if (len < 0 || (size_t)len >= sizeof(strbuf))
fatalx("uuid string too long");
free(str);
if ((fd = mkstemp(tmpl)) == -1) {
log_warn("mkstemp");
goto err;
}
if (write(fd, strbuf, len) < len) {
log_warn("write");
goto err;
}
if (fchmod(fd, 0644) == -1) {
log_warn("fchmod");
goto err;
}
if (close(fd) == -1) {
log_warn("fchmod");
goto err;
}
fd = -1;
if (rename(tmpl, _PATH_UUID) == -1) {
log_warn("rename");
goto err;
}
} else {
read(fd, strbuf, sizeof(strbuf));
close(fd);
strbuf[sizeof(strbuf) - 2] = '\0';
uuid_from_string(strbuf, &uuid, &status);
if (status != uuid_s_ok) {
log_warnx("failed to convert string to uuid: %s - %d",
strbuf, status);
goto gen;
}
}
uuid_enc_be(uuid_buf, &uuid);
return (uuid_buf);
err:
if (fd != -1)
close(fd);
unlink(tmpl);
fatal("Could not read or create UUID");
}
