#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 <netinet/if_ether.h>
#include <netinet/in_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 "bpf.h"
#include "log.h"
#include "dhcpleased.h"
#include "frontend.h"
#include "engine.h"
#include "control.h"
enum dhcpleased_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 dhcpleased_process, char *, int, int, int);
void main_dispatch_frontend(int, short, void *);
void main_dispatch_engine(int, short, void *);
void open_bpfsock(uint32_t);
void configure_interface(struct imsg_configure_interface *);
void deconfigure_interface(struct imsg_configure_interface *);
void propose_rdns(struct imsg_propose_rdns *);
void configure_routes(uint8_t, struct imsg_configure_interface *);
void configure_route(uint8_t, uint32_t, int, struct sockaddr_in *, struct
sockaddr_in *, struct sockaddr_in *, struct sockaddr_in *, int);
void read_lease_file(struct imsg_ifinfo *);
static 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);
#ifndef SMALL
int main_imsg_send_config(struct dhcpleased_conf *);
#endif
int main_reload(void);
static struct imsgev *iev_frontend;
static struct imsgev *iev_engine;
#ifndef SMALL
struct dhcpleased_conf *main_conf;
#endif
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:
#ifndef SMALL
if (main_reload() == -1)
log_warnx("configuration reload failed");
else
log_debug("configuration reloaded");
#endif
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_DHCPLEASED_SOCKET;
#ifndef SMALL
int control_fd;
#endif
log_init(1, LOG_DAEMON);
log_setverbose(1);
saved_argv0 = argv[0];
if (saved_argv0 == NULL)
saved_argv0 = "dhcpleased";
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);
#ifndef SMALL
if ((main_conf = parse_config(conffile)) == NULL)
exit(1);
if (no_action) {
if (verbose)
print_config(main_conf);
else
fprintf(stderr, "configuration OK\n");
exit(0);
}
#endif
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(DHCPLEASED_USER) == NULL)
errx(1, "unknown user %s", DHCPLEASED_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_INET, 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_PROPOSAL) |
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)");
#ifndef SMALL
if ((control_fd = control_init(csock)) == -1)
warnx("control socket setup failed");
#endif
if (unveil(conffile, "r") == -1)
fatal("unveil %s", conffile);
if (unveil("/dev/bpf", "rw") == -1)
fatal("unveil /dev/bpf");
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 notyet
if (pledge("stdio inet rpath wpath sendfd wroute bpf", NULL) == -1)
fatal("pledge");
#endif
main_imsg_compose_frontend(IMSG_ROUTESOCK, frontend_routesock, NULL, 0);
#ifndef SMALL
if (control_fd != -1)
main_imsg_compose_frontend(IMSG_CONTROLFD, control_fd, NULL, 0);
main_imsg_send_config(main_conf);
#endif
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);
#ifndef SMALL
config_clear(main_conf);
#endif
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 dhcpleased_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, type;
#ifndef SMALL
int verbose;
#endif
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;
type = imsg_get_type(&imsg);
switch (type) {
case IMSG_OPEN_BPFSOCK:
if (imsg_get_data(&imsg, &if_index,
sizeof(if_index)) == -1)
fatalx("%s: invalid %s", __func__, i2s(type));
open_bpfsock(if_index);
break;
#ifndef SMALL
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_get_data(&imsg, &verbose,
sizeof(verbose)) == -1)
fatalx("%s: invalid %s", __func__, i2s(type));
log_setverbose(verbose);
break;
#endif
case IMSG_UPDATE_IF:
if (imsg_get_data(&imsg, &imsg_ifinfo,
sizeof(imsg_ifinfo)) == -1)
fatalx("%s: invalid %s", __func__, i2s(type));
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__, 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;
uint32_t type;
int shut = 0;
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;
type = imsg_get_type(&imsg);
switch (type) {
case IMSG_CONFIGURE_INTERFACE: {
struct imsg_configure_interface imsg_interface;
if (imsg_get_data(&imsg, &imsg_interface,
sizeof(imsg_interface)) == -1)
fatalx("%s: invalid %s", __func__, i2s(type));
if (imsg_interface.file[
sizeof(imsg_interface.file) - 1] != '\0')
fatalx("%s: invalid %s", __func__, i2s(type));
if (imsg_interface.domainname[
sizeof(imsg_interface.domainname) - 1] != '\0')
fatalx("%s: invalid %s", __func__, i2s(type));
if (imsg_interface.hostname[
sizeof(imsg_interface.hostname) - 1] != '\0')
fatalx("%s: invalid %s", __func__, i2s(type));
if (imsg_interface.routes_len >= MAX_DHCP_ROUTES)
fatalx("%s: too many routes in imsg", __func__);
configure_interface(&imsg_interface);
break;
}
case IMSG_DECONFIGURE_INTERFACE: {
struct imsg_configure_interface imsg_interface;
if (imsg_get_data(&imsg, &imsg_interface,
sizeof(imsg_interface)) == -1)
fatalx("%s: invalid %s", __func__, i2s(type));
if (imsg_interface.file[
sizeof(imsg_interface.file) - 1] != '\0')
fatalx("%s: invalid %s", __func__, i2s(type));
if (imsg_interface.domainname[
sizeof(imsg_interface.domainname) - 1] != '\0')
fatalx("%s: invalid %s", __func__, i2s(type));
if (imsg_interface.hostname[
sizeof(imsg_interface.hostname) - 1] != '\0')
fatalx("%s: invalid %s", __func__, i2s(type));
if (imsg_interface.routes_len >= MAX_DHCP_ROUTES)
fatalx("%s: too many routes in imsg", __func__);
deconfigure_interface(&imsg_interface);
main_imsg_compose_frontend(IMSG_CLOSE_UDPSOCK, -1,
&imsg_interface.if_index,
sizeof(imsg_interface.if_index));
break;
}
case IMSG_WITHDRAW_ROUTES: {
struct imsg_configure_interface imsg_interface;
if (imsg_get_data(&imsg, &imsg_interface,
sizeof(imsg_interface)) == -1)
fatalx("%s: invalid %s", __func__, i2s(type));
if (imsg_interface.file[
sizeof(imsg_interface.file) - 1] != '\0')
fatalx("%s: invalid %s", __func__, i2s(type));
if (imsg_interface.domainname[
sizeof(imsg_interface.domainname) - 1] != '\0')
fatalx("%s: invalid %s", __func__, i2s(type));
if (imsg_interface.hostname[
sizeof(imsg_interface.hostname) - 1] != '\0')
fatalx("%s: invalid %s", __func__, i2s(type));
if (imsg_interface.routes_len >= MAX_DHCP_ROUTES)
fatalx("%s: too many routes in imsg", __func__);
if (imsg_interface.routes_len > 0)
configure_routes(RTM_DELETE, &imsg_interface);
break;
}
case IMSG_PROPOSE_RDNS: {
struct imsg_propose_rdns rdns;
if (imsg_get_data(&imsg, &rdns, sizeof(rdns)) == -1)
fatalx("%s: invalid %s", __func__, i2s(type));
if ((2 + rdns.rdns_count * sizeof(struct in_addr)) >
sizeof(struct sockaddr_rtdns))
fatalx("%s: rdns_count too big: %d", __func__,
rdns.rdns_count);
if (rdns.rdns_count > MAX_RDNS_COUNT)
fatalx("%s: rdns_count too big: %d", __func__,
rdns.rdns_count);
propose_rdns(&rdns);
break;
}
case IMSG_WITHDRAW_RDNS: {
struct imsg_propose_rdns rdns;
if (imsg_get_data(&imsg, &rdns, sizeof(rdns)) == -1)
fatalx("%s: invalid %s", __func__, i2s(type));
if (rdns.rdns_count != 0)
fatalx("%s: expected rdns_count == 0: %d",
__func__, rdns.rdns_count);
propose_rdns(&rdns);
break;
}
default:
log_debug("%s: error handling imsg %d", __func__, 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
imsg_forward_event(struct imsgev *iev, struct imsg *imsg)
{
int ret;
if ((ret = imsg_forward(&iev->ibuf, imsg)) != -1)
imsg_event_add(iev);
return (ret);
}
static 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);
}
#ifndef SMALL
int
main_reload(void)
{
struct dhcpleased_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 dhcpleased_conf *xconf)
{
struct iface_conf *iface_conf;
main_imsg_compose_frontend(IMSG_RECONF_CONF, -1, NULL, 0);
main_imsg_compose_engine(IMSG_RECONF_CONF, -1, NULL, 0);
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));
if (iface_conf->vc_id_len) {
main_imsg_compose_frontend(IMSG_RECONF_VC_ID, -1,
iface_conf->vc_id, iface_conf->vc_id_len);
main_imsg_compose_engine(IMSG_RECONF_VC_ID, -1,
iface_conf->vc_id, iface_conf->vc_id_len);
}
if (iface_conf->c_id_len) {
main_imsg_compose_frontend(IMSG_RECONF_C_ID, -1,
iface_conf->c_id, iface_conf->c_id_len);
main_imsg_compose_engine(IMSG_RECONF_C_ID, -1,
iface_conf->c_id, iface_conf->c_id_len);
}
if (iface_conf->h_name != NULL)
main_imsg_compose_frontend(IMSG_RECONF_H_NAME, -1,
iface_conf->h_name, strlen(iface_conf->h_name) + 1);
}
main_imsg_compose_frontend(IMSG_RECONF_END, -1, NULL, 0);
main_imsg_compose_engine(IMSG_RECONF_END, -1, NULL, 0);
return (0);
}
#endif
void
configure_interface(struct imsg_configure_interface *imsg)
{
struct ifaliasreq ifaliasreq;
struct ifaddrs *ifap, *ifa;
struct sockaddr_in *req_sin_addr, *req_sin_mask;
int found = 0, udpsock, opt = 1, len, fd = -1;
char *if_name;
char ip_ntop_buf[INET_ADDRSTRLEN];
char nextserver_ntop_buf[INET_ADDRSTRLEN];
char lease_buf[LEASE_SIZE];
char lease_file_buf[sizeof(_PATH_LEASE) +
IF_NAMESIZE];
char tmpl[] = _PATH_LEASE"XXXXXXXXXX";
memset(&ifaliasreq, 0, sizeof(ifaliasreq));
if_name = if_indextoname(imsg->if_index, ifaliasreq.ifra_name);
if (if_name == NULL) {
log_warnx("%s: cannot find interface %d", __func__,
imsg->if_index);
return;
}
log_debug("%s %s", __func__, if_name);
if (getifaddrs(&ifap) != 0)
fatal("getifaddrs");
req_sin_addr = (struct sockaddr_in *)&ifaliasreq.ifra_addr;
req_sin_addr->sin_family = AF_INET;
req_sin_addr->sin_len = sizeof(*req_sin_addr);
for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
struct in_addr addr, mask;
if (strcmp(if_name, ifa->ifa_name) != 0)
continue;
if (ifa->ifa_addr == NULL)
continue;
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
mask = ((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
if (imsg->addr.s_addr == addr.s_addr) {
if (imsg->mask.s_addr == mask.s_addr)
found = 1;
else {
req_sin_addr->sin_addr = addr;
if (ioctl(ioctl_sock, SIOCDIFADDR, &ifaliasreq)
== -1) {
if (errno != EADDRNOTAVAIL)
log_warn("SIOCDIFADDR");
}
}
break;
}
}
freeifaddrs(ifap);
req_sin_addr->sin_addr = imsg->addr;
if (!found) {
req_sin_mask = (struct sockaddr_in *)&ifaliasreq.ifra_mask;
req_sin_mask->sin_family = AF_INET;
req_sin_mask->sin_len = sizeof(*req_sin_mask);
req_sin_mask->sin_addr = imsg->mask;
if (ioctl(ioctl_sock, SIOCAIFADDR, &ifaliasreq) == -1)
log_warn("SIOCAIFADDR");
}
if (imsg->routes_len > 0)
configure_routes(RTM_ADD, imsg);
req_sin_addr->sin_port = ntohs(CLIENT_PORT);
if ((udpsock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
log_warn("socket");
return;
}
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, &imsg->rdomain,
sizeof(imsg->rdomain)) == -1) {
log_warn("setsockopt SO_RTABLE");
close(udpsock);
return;
}
if (bind(udpsock, (struct sockaddr *)req_sin_addr,
sizeof(*req_sin_addr)) == -1) {
close(udpsock);
return;
}
shutdown(udpsock, SHUT_RD);
main_imsg_compose_frontend(IMSG_UDPSOCK, udpsock,
&imsg->if_index, sizeof(imsg->if_index));
if (no_lease_files)
return;
if (inet_ntop(AF_INET, &imsg->addr, ip_ntop_buf, sizeof(ip_ntop_buf)) ==
NULL) {
log_warn("%s: inet_ntop", __func__);
return;
}
if (imsg->siaddr.s_addr == INADDR_ANY)
nextserver_ntop_buf[0] = '\0';
else {
if (inet_ntop(AF_INET, &imsg->siaddr, nextserver_ntop_buf,
sizeof(nextserver_ntop_buf)) == NULL) {
log_warn("%s: inet_ntop", __func__);
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;
}
len = snprintf(lease_buf, sizeof(lease_buf),
"%s\n%s%s\n%s%s\n%s%s\n%s%s\n%s%s\n",
LEASE_VERSION, LEASE_IP_PREFIX, ip_ntop_buf,
LEASE_NEXTSERVER_PREFIX, nextserver_ntop_buf, LEASE_BOOTFILE_PREFIX,
imsg->file, LEASE_HOSTNAME_PREFIX, imsg->hostname,
LEASE_DOMAIN_PREFIX, imsg->domainname);
if ( len == -1 || (size_t) len >= sizeof(lease_buf)) {
log_warnx("%s: failed to encode lease for %s", __func__,
ip_ntop_buf);
return;
}
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
deconfigure_interface(struct imsg_configure_interface *imsg)
{
struct ifaliasreq ifaliasreq;
struct sockaddr_in *req_sin_addr;
memset(&ifaliasreq, 0, sizeof(ifaliasreq));
#if 0
if (imsg->routes_len > 0)
configure_routes(RTM_DELETE, imsg);
#endif
if (if_indextoname(imsg->if_index, ifaliasreq.ifra_name) == NULL) {
log_warnx("%s: cannot find interface %d", __func__,
imsg->if_index);
return;
}
log_debug("%s %s", __func__, ifaliasreq.ifra_name);
req_sin_addr = (struct sockaddr_in *)&ifaliasreq.ifra_addr;
req_sin_addr->sin_family = AF_INET;
req_sin_addr->sin_len = sizeof(*req_sin_addr);
req_sin_addr->sin_addr = imsg->addr;
if (ioctl(ioctl_sock, SIOCDIFADDR, &ifaliasreq) == -1) {
if (errno != EADDRNOTAVAIL)
log_warn("SIOCDIFADDR");
}
}
void
configure_routes(uint8_t rtm_type, struct imsg_configure_interface *imsg)
{
struct sockaddr_in dst, mask, gw, ifa;
in_addr_t addrnet, gwnet;
int i;
memset(&ifa, 0, sizeof(ifa));
ifa.sin_family = AF_INET;
ifa.sin_len = sizeof(ifa);
ifa.sin_addr = imsg->addr;
memset(&dst, 0, sizeof(dst));
dst.sin_family = AF_INET;
dst.sin_len = sizeof(dst);
memset(&mask, 0, sizeof(mask));
mask.sin_family = AF_INET;
mask.sin_len = sizeof(mask);
memset(&gw, 0, sizeof(gw));
gw.sin_family = AF_INET;
gw.sin_len = sizeof(gw);
addrnet = imsg->addr.s_addr & imsg->mask.s_addr;
for (i = 0; i < imsg->routes_len; i++) {
dst.sin_addr = imsg->routes[i].dst;
mask.sin_addr = imsg->routes[i].mask;
gw.sin_addr = imsg->routes[i].gw;
if (gw.sin_addr.s_addr == INADDR_ANY) {
configure_route(rtm_type, imsg->if_index,
imsg->rdomain, &dst, &mask, &ifa, NULL,
RTF_CLONING);
} else if (mask.sin_addr.s_addr == INADDR_ANY) {
gwnet = gw.sin_addr.s_addr & imsg->mask.s_addr;
if (addrnet != gwnet) {
mask.sin_addr.s_addr = 0xffffffff;
configure_route(rtm_type, imsg->if_index,
imsg->rdomain, &gw, &mask, &ifa, NULL,
RTF_CLONING);
mask.sin_addr = imsg->routes[i].mask;
}
if (gw.sin_addr.s_addr == ifa.sin_addr.s_addr) {
configure_route(rtm_type, imsg->if_index,
imsg->rdomain, &dst, &mask, &gw, NULL, 0);
} else {
configure_route(rtm_type, imsg->if_index,
imsg->rdomain, &dst, &mask, &gw, &ifa,
RTF_GATEWAY);
}
} else {
configure_route(rtm_type, imsg->if_index, imsg->rdomain,
&dst, &mask, &gw, NULL, RTF_GATEWAY);
}
}
}
#define ROUNDUP(a) \
(((a) & (sizeof(long) - 1)) ? (1 + ((a) | (sizeof(long) - 1))) : (a))
void
configure_route(uint8_t rtm_type, uint32_t if_index, int rdomain, struct
sockaddr_in *dst, struct sockaddr_in *mask, struct sockaddr_in *gw,
struct sockaddr_in *ifa, int rtm_flags)
{
struct rt_msghdr rtm;
struct sockaddr_dl ifp;
struct sockaddr_rtlabel rl;
struct iovec iov[14];
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_index = if_index;
rtm.rtm_tableid = rdomain;
rtm.rtm_seq = ++rtm_seq;
rtm.rtm_priority = RTP_NONE;
rtm.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK | RTA_IFP |
RTA_LABEL;
rtm.rtm_flags = RTF_UP | RTF_STATIC | RTF_MPATH | rtm_flags;
if (ifa)
rtm.rtm_addrs |= RTA_IFA;
iov[iovcnt].iov_base = &rtm;
iov[iovcnt++].iov_len = sizeof(rtm);
iov[iovcnt].iov_base = dst;
iov[iovcnt++].iov_len = dst->sin_len;
rtm.rtm_msglen += dst->sin_len;
padlen = ROUNDUP(dst->sin_len) - dst->sin_len;
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
iov[iovcnt].iov_base = gw;
iov[iovcnt++].iov_len = gw->sin_len;
rtm.rtm_msglen += gw->sin_len;
padlen = ROUNDUP(gw->sin_len) - gw->sin_len;
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
iov[iovcnt].iov_base = mask;
iov[iovcnt++].iov_len = mask->sin_len;
rtm.rtm_msglen += mask->sin_len;
padlen = ROUNDUP(mask->sin_len) - mask->sin_len;
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
memset(&ifp, 0, sizeof(ifp));
ifp.sdl_len = sizeof(struct sockaddr_dl);
ifp.sdl_family = AF_LINK;
ifp.sdl_index = if_index;
iov[iovcnt].iov_base = &ifp;
iov[iovcnt++].iov_len = sizeof(ifp);
rtm.rtm_msglen += sizeof(ifp);
padlen = ROUNDUP(sizeof(ifp)) - sizeof(ifp);
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
if (ifa) {
iov[iovcnt].iov_base = ifa;
iov[iovcnt++].iov_len = ifa->sin_len;
rtm.rtm_msglen += ifa->sin_len;
padlen = ROUNDUP(ifa->sin_len) - ifa->sin_len;
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",
DHCPLEASED_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");
}
}
#ifndef SMALL
const char*
sin_to_str(struct sockaddr_in *sin)
{
static char hbuf[NI_MAXHOST];
int error;
error = getnameinfo((struct sockaddr *)sin, sin->sin_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;
}
#endif
void
open_bpfsock(uint32_t if_index)
{
int bpfsock;
char ifname[IF_NAMESIZE];
if (if_indextoname(if_index, ifname) == NULL) {
log_warnx("%s: cannot find interface %d", __func__, if_index);
return;
}
if ((bpfsock = get_bpf_sock(ifname)) == -1)
return;
main_imsg_compose_frontend(IMSG_BPFSOCK, bpfsock, &if_index,
sizeof(if_index));
}
void
propose_rdns(struct imsg_propose_rdns *rdns)
{
struct rt_msghdr rtm;
struct sockaddr_rtdns rtdns;
struct iovec iov[3];
long pad = 0;
int iovcnt = 0, padlen;
memset(&rtm, 0, sizeof(rtm));
rtm.rtm_version = RTM_VERSION;
rtm.rtm_type = RTM_PROPOSAL;
rtm.rtm_msglen = sizeof(rtm);
rtm.rtm_tableid = rdns->rdomain;
rtm.rtm_index = rdns->if_index;
rtm.rtm_seq = ++rtm_seq;
rtm.rtm_priority = RTP_PROPOSAL_DHCLIENT;
rtm.rtm_addrs = RTA_DNS;
rtm.rtm_flags = RTF_UP;
iov[iovcnt].iov_base = &rtm;
iov[iovcnt++].iov_len = sizeof(rtm);
memset(&rtdns, 0, sizeof(rtdns));
rtdns.sr_family = AF_INET;
rtdns.sr_len = 2 + rdns->rdns_count * sizeof(struct in_addr);
memcpy(rtdns.sr_dns, rdns->rdns, rtdns.sr_len - 2);
iov[iovcnt].iov_base = &rtdns;
iov[iovcnt++].iov_len = sizeof(rtdns);
rtm.rtm_msglen += sizeof(rtdns);
padlen = ROUNDUP(sizeof(rtdns)) - sizeof(rtdns);
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
if (writev(routesock, iov, iovcnt) == -1)
log_warn("failed to propose nameservers");
}
void
read_lease_file(struct imsg_ifinfo *imsg_ifinfo)
{
int len, fd;
char if_name[IF_NAMESIZE];
char lease_file_buf[sizeof(_PATH_LEASE) + IF_NAMESIZE];
if (no_lease_files)
return;
memset(imsg_ifinfo->lease, 0, sizeof(imsg_ifinfo->lease));
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;
}
if ((fd = open(lease_file_buf, O_RDONLY)) == -1)
return;
read(fd, imsg_ifinfo->lease, sizeof(imsg_ifinfo->lease) - 1);
close(fd);
}
#ifndef SMALL
void
merge_config(struct dhcpleased_conf *conf, struct dhcpleased_conf *xconf)
{
struct iface_conf *iface_conf;
while ((iface_conf = SIMPLEQ_FIRST(&conf->iface_list)) != NULL) {
SIMPLEQ_REMOVE_HEAD(&conf->iface_list, entry);
free(iface_conf->vc_id);
free(iface_conf->c_id);
free(iface_conf->h_name);
free(iface_conf);
}
SIMPLEQ_CONCAT(&conf->iface_list, &xconf->iface_list);
free(xconf);
}
struct dhcpleased_conf *
config_new_empty(void)
{
struct dhcpleased_conf *xconf;
xconf = calloc(1, sizeof(*xconf));
if (xconf == NULL)
fatal(NULL);
SIMPLEQ_INIT(&xconf->iface_list);
return (xconf);
}
void
config_clear(struct dhcpleased_conf *conf)
{
struct dhcpleased_conf *xconf;
xconf = config_new_empty();
merge_config(conf, xconf);
free(conf);
}
#define I2S(x) case x: return #x
const char*
i2s(uint32_t type)
{
static char unknown[sizeof("IMSG_4294967295")];
switch (type) {
I2S(IMSG_NONE);
I2S(IMSG_CTL_LOG_VERBOSE);
I2S(IMSG_CTL_SHOW_INTERFACE_INFO);
I2S(IMSG_CTL_SEND_REQUEST);
I2S(IMSG_CTL_RELOAD);
I2S(IMSG_CTL_END);
I2S(IMSG_RECONF_CONF);
I2S(IMSG_RECONF_IFACE);
I2S(IMSG_RECONF_VC_ID);
I2S(IMSG_RECONF_C_ID);
I2S(IMSG_RECONF_H_NAME);
I2S(IMSG_RECONF_END);
I2S(IMSG_SEND_DISCOVER);
I2S(IMSG_SEND_REQUEST);
I2S(IMSG_SOCKET_IPC);
I2S(IMSG_OPEN_BPFSOCK);
I2S(IMSG_BPFSOCK);
I2S(IMSG_UDPSOCK);
I2S(IMSG_CLOSE_UDPSOCK);
I2S(IMSG_ROUTESOCK);
I2S(IMSG_CONTROLFD);
I2S(IMSG_STARTUP);
I2S(IMSG_UPDATE_IF);
I2S(IMSG_REMOVE_IF);
I2S(IMSG_DHCP);
I2S(IMSG_CONFIGURE_INTERFACE);
I2S(IMSG_DECONFIGURE_INTERFACE);
I2S(IMSG_PROPOSE_RDNS);
I2S(IMSG_WITHDRAW_RDNS);
I2S(IMSG_WITHDRAW_ROUTES);
I2S(IMSG_REPROPOSE_RDNS);
I2S(IMSG_REQUEST_REBOOT);
default:
snprintf(unknown, sizeof(unknown), "IMSG_%u", type);
return unknown;
}
}
#undef I2S
#endif
