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wsdd2.c
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/*
WSDD - Web Service Dynamic Discovery protocol server
Main file for general network handling.
Copyright (c) 2016 NETGEAR
Copyright (c) 2016 Hiro Sugawara
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE // asprintf()
#include "wsdd.h"
#include <stddef.h> // NULL
#include <limits.h> // HOST_NAME_MAX
#include <stdbool.h> // bool
#include <stdio.h> // snprintf(), asprintf()
#include <stdlib.h> // calloc(), free(), EXIT_FAILURE
#include <stdarg.h> // va_list, va_start()
#include <setjmp.h> // jmp_buf, setjmp(), longjmp()
#include <signal.h> // sig_atomic_t, SIGHUP, SIGINT, SIGTERM
#include <unistd.h> // gethostname(), getpid(), setsid(), close(), dup2()
#include <syslog.h> // openlog()
#include <string.h> // strncpy(), strchr(), strsignal()
#include <fcntl.h> // open()
#include <ctype.h> // isdigit(), isspace()
#include <errno.h> // errno, ENOMEM
#include <err.h> // err()
#include <libgen.h> // basename()
#include <sys/select.h> // FD_SET()
#include <sys/socket.h> // SOCK_DGRAM
#include <sys/stat.h> // stat()
#include <netdb.h> // struct servent, getservbyname()
#include <arpa/inet.h> // inet_ntop()
#include <net/if.h> // if_indextoname()
#include <netinet/in.h> // IPPROTO_IP
#include <ifaddrs.h> // struct ifaddrs, getifaddrs()
#include <linux/netlink.h> // NETLINK_ROUTE
#include <linux/rtnetlink.h> // RTMGRP_LINK
#ifndef PAGE_SIZE
#define PAGE_SIZE 4096 // PAGE_SIZE
#endif
bool is_daemon = false;
int debug_L, debug_W, debug_N;
const char *hostname = NULL, *hostaliases = NULL, *netbiosname = NULL, *netbiosaliases = NULL, *workgroup = NULL;
static char *ifname = NULL;
static unsigned ifindex = 0;
static struct ifaddrs *ifaddrs_list = NULL;
static int netlink_recv(struct endpoint *ep);
static struct service services[] = {
{
.name = "wsdd-mcast-v4",
.family = AF_INET,
.type = SOCK_DGRAM,
.port_name = "wsdd",
.port_num = 3702,
.mcast_addr = "239.255.255.250",
.init = wsd_init,
.recv = wsd_recv,
.exit = wsd_exit,
},
{
.name = "wsdd-mcast-v6",
.family = AF_INET6,
.type = SOCK_DGRAM,
.port_name = "wsdd",
.port_num = 3702,
.mcast_addr = "ff02::c",
.init = wsd_init,
.recv = wsd_recv,
.exit = wsd_exit,
},
{
.name = "wsdd-http-v4",
.family = AF_INET,
.type = SOCK_STREAM,
.port_name = "wsdd",
.port_num = 3702,
.recv = wsd_recv,
},
{
.name = "wsdd-http-v6",
.family = AF_INET6,
.type = SOCK_STREAM,
.port_name = "wsdd",
.port_num = 3702,
.recv = wsd_recv,
},
{
.name = "llmnr-mcast-v4",
.family = AF_INET,
.type = SOCK_DGRAM,
.port_name = "llmnr",
.port_num = 5355,
.mcast_addr = "224.0.0.252",
.init = llmnr_init,
.recv = llmnr_recv,
.exit = llmnr_exit,
},
{
.name = "llmnr-mcast-v6",
.family = AF_INET6,
.type = SOCK_DGRAM,
.port_name = "llmnr",
.port_num = 5355,
.mcast_addr = "ff02::1:3",
.init = llmnr_init,
.recv = llmnr_recv,
.exit = llmnr_exit,
},
{
.name = "llmnr-tcp-v4",
.family = AF_INET,
.type = SOCK_STREAM,
.port_name = "llmnr",
.port_num = 5355,
.init = llmnr_init,
.recv = llmnr_recv,
.exit = llmnr_exit,
},
{
.name = "llmnr-tcp-v6",
.family = AF_INET6,
.type = SOCK_STREAM,
.port_name = "llmnr",
.port_num = 5355,
.init = llmnr_init,
.recv = llmnr_recv,
.exit = llmnr_exit,
},
{
.name = "netlink-v4v6",
.family = AF_NETLINK,
.type = SOCK_RAW,
.protocol = NETLINK_ROUTE,
.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR,
.recv = netlink_recv,
},
};
/*
* Find the interface address *ci which corresponds to received message sender address *sa
* in order to reply with the "right" IP address.
*/
int connected_if(const _saddr_t *sa, _saddr_t *ci)
{
int rv = -1;
for (struct ifaddrs *ifa = ifaddrs_list; ifa; ifa = ifa->ifa_next) {
const uint8_t *_if, *_nm, *_sa;
uint8_t *_ca;
size_t alen;
if (ifa->ifa_flags & IFF_SLAVE || !ifa->ifa_netmask ||
!ifa->ifa_addr || ifa->ifa_addr->sa_family != sa->sa.sa_family)
continue;
if (ifindex && if_nametoindex(ifa->ifa_name) != ifindex)
continue;
if (debug_W >= 4) {
char ifa_addr[_ADDRSTRLEN], ifa_netmask[_ADDRSTRLEN], sa_addr[_ADDRSTRLEN];
if (!inet_ntop(ifa->ifa_addr->sa_family, _SIN_ADDR((_saddr_t *)ifa->ifa_addr), ifa_addr, sizeof(ifa_addr)))
ifa_addr[0] = '\0';
if (!inet_ntop(sa->sa.sa_family, _SIN_ADDR(sa), ifa_netmask, sizeof(ifa_netmask)))
ifa_netmask[0] = '\0';
if (!inet_ntop(ifa->ifa_netmask->sa_family, _SIN_ADDR((_saddr_t *)ifa->ifa_netmask), sa_addr, sizeof(sa_addr)))
sa_addr[0] = '\0';
DEBUG(4, W, "%s: %s: if=%s nm=%s sc=%s", __func__, ifa->ifa_name, ifa_addr, ifa_netmask, sa_addr);
}
switch (sa->ss.ss_family) {
case AF_INET:
_if = (uint8_t *) &((_saddr_t *)ifa->ifa_addr)->in.sin_addr;
_nm = (uint8_t *) &((_saddr_t *)ifa->ifa_netmask)->in.sin_addr;
_sa = (uint8_t *) &sa->in.sin_addr;
_ca = (uint8_t *) &ci->in.sin_addr;
alen = sizeof(sa->in.sin_addr);
break;
case AF_INET6:
_if = (uint8_t *) &((_saddr_t *)ifa->ifa_addr)->in6.sin6_addr;
_nm = (uint8_t *) &((_saddr_t *)ifa->ifa_netmask)->in6.sin6_addr;
_sa = (uint8_t *) &sa->in6.sin6_addr;
_ca = (uint8_t *) &ci->in6.sin6_addr;
alen = sizeof(sa->in6.sin6_addr);
break;
default:
continue;
}
rv = 0;
for (size_t i = 0; i < alen; i++) {
if ((_if[i] & _nm[i]) != (_sa[i] & _nm[i])) {
rv = -1;
break;
}
}
if (!rv) {
ci->ss.ss_family = sa->ss.ss_family;
memcpy(_ca, _if, alen);
break;
}
}
if (debug_W >= 4) {
char name[_ADDRSTRLEN];
if (inet_ntop(ci->ss.ss_family, _SIN_ADDR(ci), name, sizeof(name)))
DEBUG(4, W, "%s: ci=%s rv=%d", __func__, name, rv);
}
if (rv) errno = ENONET;
return rv;
}
char *ip2uri(const char *ip)
{
if (*ip == '[' || !strchr(ip, ':'))
return strdup(ip);
char *uri = NULL;
#if 0 /* WINDOWS 7 does not honor [xx::xx] notation. */
asprintf(&uri, "[%s]", ip);
#else
char name[HOST_NAME_MAX + 1];
if (!gethostname(name, sizeof(name) - 1))
uri = strdup(name);
#endif
return uri;
}
static struct endpoint *endpoints;
static const struct sock_params {
int family;
const char *name;
int ipproto_ip;
int ip_multicast_loop;
int ip_add_membership;
int ip_drop_membership;
int ip_pktinfo;
size_t llen, mlen, mreqlen;
} sock_params[] = {
[AF_INET] = {
.family = AF_INET,
.name = "IPv4",
.ipproto_ip = IPPROTO_IP,
.ip_multicast_loop = IP_MULTICAST_LOOP,
.ip_add_membership = IP_ADD_MEMBERSHIP,
.ip_drop_membership = IP_DROP_MEMBERSHIP,
.ip_pktinfo = IP_PKTINFO,
.llen = sizeof(struct sockaddr_in),
.mlen = sizeof(struct sockaddr_in),
.mreqlen = sizeof(endpoints[0].mreq.ip_mreq),
},
[AF_INET6] = {
.family = AF_INET6,
.name = "IPv6",
.ipproto_ip = IPPROTO_IPV6,
.ip_multicast_loop = IPV6_MULTICAST_LOOP,
.ip_add_membership = IPV6_ADD_MEMBERSHIP,
.ip_drop_membership = IPV6_DROP_MEMBERSHIP,
.ip_pktinfo = IPV6_RECVPKTINFO,
.llen = sizeof(struct sockaddr_in6),
.mlen = sizeof(struct sockaddr_in6),
.mreqlen = sizeof(endpoints[0].mreq.ipv6_mreq),
},
[AF_NETLINK] = {
.family = AF_NETLINK,
.name = "NETLINK",
.llen = sizeof(struct sockaddr_nl),
},
};
static const char *const socktype_str[] = {
[SOCK_STREAM] = "tcp",
[SOCK_DGRAM] = "udp",
[SOCK_SEQPACKET] = "seq",
};
static int open_ep(struct endpoint **epp, struct service *sv, const struct ifaddrs *ifa)
{
#define __FUNCTION__ "open_ep"
const unsigned int disable = 0, enable = 1;
struct endpoint *ep = (struct endpoint *) calloc(sizeof(*ep), 1);
if ((*epp = ep) == NULL) {
errno = ENOMEM;
err(EXIT_FAILURE, __FUNCTION__ ": calloc");
}
strncpy(ep->ifname, ifa->ifa_name, sizeof(ep->ifname));
ep->service = sv;
ep->family = sv->family;
ep->type = sv->type;
ep->protocol = sv->protocol;
if (sv->family >= (int) ARRAY_SIZE(sock_params) || !sock_params[ep->family].name) {
ep->errstr = __FUNCTION__ ": Unsupported address family";
ep->_errno = EINVAL;
return -1;
}
if (sv->family == AF_INET || sv->family == AF_INET6) {
struct servent *se = getservbyname(sv->port_name, socktype_str[sv->type]);
ep->port = se ? ntohs(se->s_port) : 0;
if (!ep->port)
ep->port = sv->port_num;
if (!ep->port) {
ep->errstr = __FUNCTION__ ": No port number";
ep->_errno = EADDRNOTAVAIL;
return -1;
}
}
const struct sock_params *sp = &sock_params[ep->family];
ep->mcast.ss.ss_family = ep->family;
ep->mlen = sp->mlen;
ep->local.ss.ss_family = ep->family;
ep->llen = sp->llen;
ep->mreqlen = sp->mreqlen;
switch (ep->family) {
case AF_INET:
if (sv->mcast_addr) {
ep->mcast.in.sin_port = htons(ep->port);
if (inet_pton(ep->family, sv->mcast_addr, &ep->mcast.in.sin_addr.s_addr) != 1) {
ep->errstr = __FUNCTION__ ": Bad mcast IP addr";
ep->_errno = errno;
return -1;
}
ep->mreq.ip_mreq.imr_multiaddr = ep->mcast.in.sin_addr;
#ifdef USE_ip_mreq
ep->mreq.ip_mreq.imr_interface = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
#else
ep->mreq.ip_mreq.imr_address = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
ep->mreq.ip_mreq.imr_ifindex = if_nametoindex(ep->ifname);
#endif
}
//ep->local.saddr_in = *(struct sockaddr_in *)ifa->ifa_addr;
ep->local.in.sin_addr.s_addr = htonl(INADDR_ANY);
ep->local.in.sin_port = htons(ep->port);
break;
case AF_INET6:
if (sv->mcast_addr) {
ep->mcast.in6.sin6_port = htons(ep->port);
if (inet_pton(ep->family, sv->mcast_addr, ep->mcast.in6.sin6_addr.s6_addr) != 1) {
ep->errstr = __FUNCTION__ ": Bad mcast IPv6 addr";
ep->_errno = errno;
return -1;
}
ep->mreq.ipv6_mreq.ipv6mr_multiaddr = ep->mcast.in6.sin6_addr;
ep->mreq.ipv6_mreq.ipv6mr_interface = if_nametoindex(ep->ifname);
}
//ep->local.in6 = *(struct sockaddr_in6 *)ifa->ifa_addr;
ep->local.in6.sin6_addr = in6addr_any;
ep->local.in6.sin6_port = htons(ep->port);
break;
case AF_NETLINK:
ep->local.nl.nl_pid = getpid();
ep->local.nl.nl_groups = ep->service->nl_groups;
break;
}
ep->sock = socket(ep->family, ep->type | SOCK_CLOEXEC, ep->protocol);
if (ep->sock < 0) {
ep->errstr = __FUNCTION__ ": Can't open socket";
ep->_errno = errno;
return -1;
}
setsockopt(ep->sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof enable);
#ifdef SO_REUSEPORT
setsockopt(ep->sock, SOL_SOCKET, SO_REUSEPORT, &enable, sizeof enable);
#endif
#ifdef SO_RCVBUFFORCE
int rcvbuf = 128 * 1024;
if ((ep->family == AF_NETLINK) &&
setsockopt(ep->sock, SOL_SOCKET, SO_RCVBUFFORCE, &rcvbuf, sizeof rcvbuf)) {
LOG(LOG_WARNING, "%s: SO_RCVBUFFORCE: %s", __FUNCTION__, strerror(errno));
}
#endif
#ifdef IPV6_V6ONLY
if ((ep->family == AF_INET6) &&
setsockopt(ep->sock, sp->ipproto_ip, IPV6_V6ONLY, &enable, sizeof enable)) {
ep->errstr = __FUNCTION__ ": IPV6_V6ONLY";
ep->_errno = errno;
close(ep->sock);
return -1;
}
#endif
#ifdef SO_BINDTODEVICE
if (!sv->mcast_addr && (ep->family == AF_INET || ep->family == AF_INET6)) {
if (setsockopt(ep->sock, SOL_SOCKET, SO_BINDTODEVICE, ep->ifname, strlen(ep->ifname))) {
ep->errstr = __FUNCTION__ ": SO_BINDTODEVICE";
ep->_errno = errno;
close(ep->sock);
return -1;
}
}
#endif
if (bind(ep->sock, (struct sockaddr *)&ep->local, ep->llen)) {
ep->errstr = __FUNCTION__ ": bind";
ep->_errno = errno;
close(ep->sock);
ep->sock = -1;
DEBUG(0, W, "%s: %s: %s", ep->service->name, ep->errstr, strerror(ep->_errno));
return (ep->_errno == EADDRINUSE) ? 0 : -1;
}
if (ep->type == SOCK_DGRAM &&
setsockopt(ep->sock, sp->ipproto_ip, sp->ip_pktinfo, &enable, sizeof(enable))) {
ep->errstr = __FUNCTION__ ": PKTINFO";
ep->_errno = errno;
close(ep->sock);
return -1;
}
if (sv->mcast_addr) {
#ifdef IP_MULTICAST_IF
/* Set multicast sending interface to avoid error: wsdd-mcast-v4: wsd_send_soap_msg: send: No route to host */
if (ep->family == AF_INET && ep->type == SOCK_DGRAM &&
setsockopt(ep->sock, sp->ipproto_ip, IP_MULTICAST_IF, &ep->mreq, ep->mreqlen)) {
ep->errstr = __FUNCTION__ ": IP_MULTICAST_IF";
ep->_errno = errno;
close(ep->sock);
return -1;
}
#endif
#ifdef IPV6_MULTICAST_IF
/* Set multicast sending interface for IPv6 */
if (ep->family == AF_INET6 && ep->type == SOCK_DGRAM &&
setsockopt(ep->sock, sp->ipproto_ip, IPV6_MULTICAST_IF, &ep->mreq.ipv6_mreq.ipv6mr_interface, sizeof(ep->mreq.ipv6_mreq.ipv6mr_interface))) {
ep->errstr = __FUNCTION__ ": IPV6_MULTICAST_IF";
ep->_errno = errno;
close(ep->sock);
return -1;
}
#endif
/* Disable loopback. */
if (setsockopt(ep->sock, sp->ipproto_ip, sp->ip_multicast_loop, &disable, sizeof(disable))) {
ep->errstr = __FUNCTION__ ": IP_MULTICAST_LOOP";
ep->_errno = errno;
close(ep->sock);
return -1;
}
/* Set inbound multicast. */
if (setsockopt(ep->sock, sp->ipproto_ip, sp->ip_add_membership, &ep->mreq, ep->mreqlen)) {
ep->errstr = __FUNCTION__ ": IP_ADD_MEMBERSHIP";
ep->_errno = errno;
close(ep->sock);
return -1;
}
}
if (ep->type == SOCK_STREAM && listen(ep->sock, 5)) {
ep->errstr = __FUNCTION__ ": listen";
ep->_errno = errno;
close(ep->sock);
return -1;
}
return 0;
#undef __FUNCTION__
}
static void close_ep(struct endpoint *ep)
{
if (ep->service->exit)
ep->service->exit(ep);
if (ep->service->mcast_addr)
setsockopt(ep->sock, sock_params[ep->family].ipproto_ip,
sock_params[ep->family].ip_drop_membership, &ep->mreq, ep->mreqlen);
close(ep->sock);
}
static jmp_buf sigenv;
volatile sig_atomic_t restart;
void restart_service(void)
{
DEBUG(1, W, "restarting service.");
restart = 1;
longjmp(sigenv, 1);
}
static bool is_new_addr(struct nlmsghdr *nh)
{
struct ifaddrmsg *ifam = (struct ifaddrmsg *) NLMSG_DATA(nh);
struct rtattr *rta = IFA_RTA(ifam);
size_t rtasize = IFA_PAYLOAD(nh);
if (nh->nlmsg_type != RTM_NEWADDR)
return false;
if (ifindex && ifam->ifa_index != ifindex) {
char buf[IFNAMSIZ];
if (!if_indextoname(ifam->ifa_index, buf) || strcmp(buf, ifname) != 0)
return false;
ifindex = ifam->ifa_index;
}
while (RTA_OK(rta, rtasize)) {
if (rta->rta_type == IFA_CACHEINFO) {
struct ifa_cacheinfo *cache_info = (struct ifa_cacheinfo *) RTA_DATA(rta);
if (cache_info->cstamp != cache_info->tstamp)
return false;
}
rta = RTA_NEXT(rta, rtasize);
}
return true;
}
static int netlink_recv(struct endpoint *ep)
{
#define __FUNCTION__ "netlink_recv"
char buf[PAGE_SIZE];
struct sockaddr_nl sa;
struct iovec iov = { buf, sizeof buf };
struct msghdr msg = { &sa, sizeof sa, &iov, 1, NULL, 0, 0 };
ssize_t msglen = recvmsg(ep->sock, &msg, 0);
DEBUG(2, W, "%s: %zd bytes", __func__, msglen);
if (msglen <= 0) {
ep->_errno = errno;
ep->errstr = __FUNCTION__ ": netlink_recv: recv";
return -1;
}
#ifdef NL_DEBUG
nl_debug(buf, msglen);
#endif
for (struct nlmsghdr *nh = (struct nlmsghdr *) buf;
NLMSG_OK(nh, msglen) && nh->nlmsg_type != NLMSG_DONE;
nh = NLMSG_NEXT(nh, msglen)) {
if (is_new_addr(nh) || nh->nlmsg_type == RTM_DELADDR) {
DEBUG(1, W, __FUNCTION__ ": address addition/change/deletion detected.");
restart_service();
break;
}
}
return 0;
#undef __FUNCTION__
}
static void sighandler(int sig)
{
DEBUG(0, W, "'%s' signal received.", strsignal(sig));
switch (sig) {
case SIGHUP:
restart = 1;
break;
default:
restart = 2;
}
}
#ifndef ASUSWRT
static char *get_smbparm(const char *name, const char *_default)
{
#define __FUNCTION__ "get_smbparm"
char *cmd = NULL, *result = NULL;
if (asprintf(&cmd, "testparm -s --parameter-name=\"%s\" 2>/dev/null", name) <= 0) {
DEBUG(0, W, __FUNCTION__ ": can't allocate cmd string");
return NULL;
}
FILE *pp = popen(cmd, "r");
free(cmd);
if (!pp) {
DEBUG(0, W, __FUNCTION__ ": can't run testparam");
return strdup(_default);
}
char buf[PAGE_SIZE];
if (!fgets(buf, sizeof(buf), pp) || !buf[0] || buf[0] == '\n') {
DEBUG(0, W, "cannot read %s from testparm", name);
result = strdup(_default);
} else { // trim whitespace
char *p;
for (p = buf + strlen(buf) - 1; buf < p && isspace(*p); p--)
*p = '\0';
for (p = buf; *p && isspace(*p); p++)
;
result = strdup(p);
}
pclose(pp);
return result;
#undef __FUNCTION__
}
#else
char *get_smbparm(const char *name, const char *_default)
{
#define __FUNCTION__ "get_smbparm"
char buf[256], *result;
FILE *fp;
char parm[64];
char value[256];
char *p, *dstp, *dstv;
int stage, c;
*value = '\0';
*parm = '\0';
if (!(fp = fopen("/etc/smb.conf","r"))) {
DEBUG(0, W, __FUNCTION__ ": can't access smb.conf");
return strdup(_default);
}
while (fgets(buf, sizeof(buf), fp)) {
stage = 0;
c = 0;
p = buf;
dstp = parm;
dstv = value;
/* Retrieve name */
while (*p && c < sizeof(parm) - 1) {
if (stage == 0 && isspace(*p)) {
p++;
continue;
} else {
stage = 1;
}
if (*p == '=') {
p++; // Skip it
break;
}
*dstp++ = *p++;
c++;
}
*dstp = '\0';
/* Trim trailing whitespace */
for (dstp = parm + strlen(parm) - 1; parm < dstp && isspace(*dstp); dstp--)
*dstp = '\0';
/* Is is the desired parameter? */
if (strcmp(parm, name))
continue;
/* Retrieve value */
stage = 0;
c = 0;
while (*p && c < sizeof(value) - 1) {
if (stage == 0 && isspace(*p)) {
p++;
continue;
} else {
stage = 1;
}
if (*p == '\n') {
break;
}
*dstv++ = *p++;
c++;
}
*dstv = '\0';
/* Trim trailing whitespace */
for (dstv = value + strlen(value) - 1; value < dstv && isspace(*dstv); dstv--)
*dstv = '\0';
break;
}
fclose(fp);
if (!*value)
result = strdup(_default);
else
result = strdup(value);
return result;
#undef __FUNCTION__
}
#endif
static void help(const char *prog, int ec, const char *fmt, ...)
{
if (fmt) {
va_list ap;
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
puts("\n");
}
printf( "WSDD and LLMNR daemon\n"
"Usage: %s [options]\n"
" -h this message\n"
" -d become daemon\n"
" -4 IPv4 only\n"
" -6 IPv6 only\n"
" -u UDP only\n"
" -t TCP only\n"
" -l LLMNR only\n"
" -w WSDD only\n"
" -L increment LLMNR debug level (%d)\n"
" -W increment WSDD debug level (%d)\n"
" -i <interface> reply only on this interface (%s)\n"
" -H <name> set host name (%s)\n"
" -A \"name list\" set host aliases (%s)\n"
" -N <name> set netbios name (%s)\n"
" -B \"name list\" set netbios aliases (%s)\n"
" -G <name> set workgroup (%s)\n"
" -b \"key1:val1,key2:val2,...\" boot parameters:\n",
prog, debug_L, debug_W, ifname ? ifname : "any",
hostname, hostaliases, netbiosname, netbiosaliases, workgroup
);
printBootInfoKeys(stdout, 11);
exit(ec);
}
static void init_sysinfo()
{
char hostn[HOST_NAME_MAX + 1];
if (!hostname && gethostname(hostn, sizeof(hostn) - 1) != 0)
err(EXIT_FAILURE, "gethostname");
char *p = strchr(hostn, '.');
if (p) *p = '\0';
hostname = strdup(hostn);
if (!hostaliases && !(hostaliases = get_smbparm("additional dns hostnames", "")))
err(EXIT_FAILURE, "get_smbparm");
if (!netbiosname && !(netbiosname = get_smbparm("netbios name", hostname)))
err(EXIT_FAILURE, "get_smbparm");
if (!netbiosaliases && !(netbiosaliases = get_smbparm("netbios aliases", "")))
err(EXIT_FAILURE, "get_smbparm");
if (!workgroup && !(workgroup = get_smbparm("workgroup", "WORKGROUP")))
err(EXIT_FAILURE, "get_smbparm");
init_getresp();
}
#define _4 1
#define _6 2
#define _TCP 1
#define _UDP 2
#define _LLMNR 1
#define _WSDD 2
int main(int argc, char **argv)
{
int opt;
const char *prog = basename(argv[0]);
unsigned int ipv46 = 0, tcpudp = 0, llmnrwsdd = 0;
init_sysinfo();
while ((opt = getopt(argc, argv, "hd46utlwLWi:H:N:G:b:")) != -1) {
switch (opt) {
case 'h':
help(prog, EXIT_SUCCESS, NULL);
break;
case 'd':
is_daemon = true;
break;
case '4':
ipv46 |= _4;
break;
case '6':
ipv46 |= _6;
break;
case 'u':
tcpudp |= _UDP;
break;
case 't':
tcpudp |= _TCP;
break;
case 'l':
llmnrwsdd |= _LLMNR;
break;
case 'w':
llmnrwsdd |= _WSDD;
break;
case 'L':
debug_L++;
break;
case 'W':
debug_W++;
break;
case 'i':
if (optarg && strlen(optarg) && strcmp(optarg, "any") != 0) {
ifname = strdup(optarg);
ifindex = ifname ? if_nametoindex(ifname) : 0;
if (!ifindex) help(prog, EXIT_FAILURE, "Bad interface '%s'", ifname);
} else {
free(ifname);
ifname = NULL;
ifindex = 0;
}
break;
case 'H':
if (optarg != NULL && strlen(optarg) > 0)
hostname = strdup(optarg);
break;
case 'N':
if (optarg != NULL && strlen(optarg) > 0)
netbiosname = strdup(optarg);
break;
case 'G':
if (optarg != NULL && strlen(optarg) > 0)
workgroup = strdup(optarg);
break;
case 'b':
while (optarg)
if (set_getresp(optarg, (const char **)&optarg) != 0)
help(prog, EXIT_FAILURE, "Bad key:val '%s'", optarg);
break;
case '?':
if (strchr("iHNGb", optopt))
printf("Option -%c requires an argument.\n", optopt);
/* ... fall through ... */
default:
help(prog, EXIT_FAILURE, "Bad option '%c'", opt);
}
}
if (argc > optind)
help(prog, EXIT_FAILURE, "Unknown argument '%s'", argv[optind]);
if (!ipv46)
ipv46 = _4 | _6;
if (!llmnrwsdd)
llmnrwsdd = _LLMNR | _WSDD;
if (!tcpudp)
tcpudp = _TCP | _UDP;
if (is_daemon) {
pid_t pid = fork();
if (pid < 0)
err(EXIT_FAILURE, "fork");
if (pid)
exit(EXIT_SUCCESS);
chdir("/");
int fd;
if ((fd = open("/dev/null", O_RDWR, 0)) != -1) {
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
if (fd > STDERR_FILENO) close(fd);
}
if (setsid() < 0)
exit(EXIT_FAILURE);
}
openlog(prog, LOG_PID, LOG_USER);
LOG(LOG_INFO, "starting.");
again:
{} /* Necessary to satisfy C syntax for statement labeling. */
struct sigaction sigact, oldact;
DEBUG(1, W, "ifname %s, ifindex %d", ifname, ifindex);
DEBUG(1, W, "hostname %s, netbios name %s, workgroup %s", hostname, netbiosname, workgroup);
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = 0;
sigact.sa_handler = sighandler;
if (sigaction(SIGINT, &sigact, &oldact) ||
sigaction(SIGHUP, &sigact, &oldact) ||
sigaction(SIGTERM, &sigact, &oldact)) {
err(EXIT_FAILURE, "cannot install signal handler.");
}
// Refresh ifaddrs list
if (ifaddrs_list != NULL)
freeifaddrs(ifaddrs_list);
if (getifaddrs(&ifaddrs_list) != 0)
err(EXIT_FAILURE, "getifaddrs()");
fd_set fds;
int rv = 0, nfds = -1;
struct endpoint *ep, *badep = NULL;
FD_ZERO(&fds);
for (size_t svn = 0; svn < ARRAY_SIZE(services); svn++) {
struct service *sv = &services[svn];
if (!(ipv46 & _4) && sv->family == AF_INET)
continue;
if (!(ipv46 & _6) && sv->family == AF_INET6)
continue;
if (!(tcpudp & _TCP) && sv->type == SOCK_STREAM)
continue;
if (!(tcpudp & _UDP) && sv->type == SOCK_DGRAM)
continue;
if (!(llmnrwsdd & _LLMNR) && strstr(sv->name, "llmnr"))
continue;
if (!(llmnrwsdd & _WSDD) && strstr(sv->name, "wsdd"))
continue;
if (sv->family == AF_INET || sv->family == AF_INET6) {
for (struct ifaddrs *ifa = ifaddrs_list; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_flags & IFF_SLAVE || !ifa->ifa_netmask ||
!ifa->ifa_addr || ifa->ifa_addr->sa_family != sv->family)
continue;
char ifaddr[_ADDRSTRLEN];
void *addr = _SIN_ADDR((_saddr_t *)ifa->ifa_addr);
inet_ntop(ifa->ifa_addr->sa_family, addr, ifaddr, sizeof(ifaddr));
if (ifname && strcmp(ifa->ifa_name, ifname) != 0) {
//DEBUG(2, W, "skipped %s: not selected", ifa->ifa_name);
ifa->ifa_flags |= IFF_SLAVE; // mark as not used
continue;
}
// skip if already bound to this interface
ep = NULL;
for (struct endpoint *e = endpoints; e; e = e->next)
if (e->service == sv && strcmp(e->ifname, ifa->ifa_name) == 0)
ep = e;
// show interface
DEBUG(1, W, "%s %s port %d %s %s @ %s%s", sv->name,
socktype_str[sv->type], sv->port_num,
sv->mcast_addr ? sv->mcast_addr : "-",
ifaddr, ifa->ifa_name, ep ? ": already bound" : "");
if (ep)
continue;
if (!ifname && sv->mcast_addr && !(ifa->ifa_flags & IFF_MULTICAST)) {
DEBUG(2, W, "skipped %s: not multicast", ifa->ifa_name);
ifa->ifa_flags |= IFF_SLAVE; // mark as not used
continue;
}
if (!ifname && (ifa->ifa_flags & IFF_LOOPBACK)) {
DEBUG(2, W, "skipped %s: loopback", ifa->ifa_name);
ifa->ifa_flags |= IFF_SLAVE; // mark as not used
continue;
}
if (!ifname && ((!strcmp(ifa->ifa_name, "LeafNets")) ||
(!strncmp(ifa->ifa_name, "docker", 6)) ||
(!strncmp(ifa->ifa_name, "veth", 4)) ||
(!strncmp(ifa->ifa_name, "tun", 3)) ||
(!strncmp(ifa->ifa_name, "ppp", 3)) ||
(!strncmp(ifa->ifa_name, "zt", 2)))) {
DEBUG(2, W, "skipped %s: excluded by name", ifa->ifa_name);
ifa->ifa_flags |= IFF_SLAVE; // mark as not used
continue;
}
// skip bridge ports unless it is specified on the command line
if (!ifname) {
struct stat st;
char path[sizeof("/sys/class/net//brport") + IFNAMSIZ];
snprintf(path, sizeof(path), "/sys/class/net/%s/brport", ifa->ifa_name);
if (stat(path, &st) == 0) {
DEBUG(2, W, "skipped %s: bridge port", ifa->ifa_name);
ifa->ifa_flags |= IFF_SLAVE; // mark as not used
continue;
}
}
// open socket for this interface/family
if (open_ep(&ep, sv, ifa) != 0) {
LOG(LOG_ERR, "error: %s: %s: %s", ep->service->name,
ep->errstr, strerror(ep->_errno));
ifa->ifa_flags |= IFF_SLAVE; // mark as not used
free(ep);
continue;
} else if (ep->sock < 0) {