static int
pptpd_listener_start(pptpd_listener *_this)
{
int sock, ival, sock_gre;
struct sockaddr_in bind_sin, bind_sin_gre;
int wildcardbinding;
#ifdef NPPPD_FAKEBIND
extern void set_faith(int, int);
#endif
wildcardbinding =
(_this->bind_sin.sin_addr.s_addr == INADDR_ANY)? 1 : 0;
sock = -1;
sock_gre = -1;
memcpy(&bind_sin, &_this->bind_sin, sizeof(bind_sin));
memcpy(&bind_sin_gre, &_this->bind_sin_gre, sizeof(bind_sin_gre));
if (_this->phy_label[0] == '\0')
strlcpy(_this->phy_label, PPTPD_DEFAULT_LAYER2_LABEL,
sizeof(_this->phy_label));
if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
pptpd_log(_this->self, LOG_ERR, "socket() failed at %s(): %m",
__func__);
goto fail;
}
ival = 1;
if(setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &ival, sizeof(ival)) < 0){
pptpd_log(_this->self, LOG_WARNING,
"setsockopt(SO_REUSEPORT) failed at %s(): %m", __func__);
}
#ifdef NPPPD_FAKEBIND
if (!wildcardbinding)
set_faith(sock, 1);
#endif
#if defined(IP_STRICT_RCVIF) && defined(USE_STRICT_RCVIF)
ival = 1;
if (setsockopt(sock, IPPROTO_IP, IP_STRICT_RCVIF, &ival, sizeof(ival))
!= 0)
pptpd_log(_this->self, LOG_WARNING,
"%s(): setsockopt(IP_STRICT_RCVIF) failed: %m", __func__);
#endif
if ((ival = fcntl(sock, F_GETFL, 0)) < 0) {
pptpd_log(_this->self, LOG_ERR,
"fcntl(F_GET_FL) failed at %s(): %m", __func__);
goto fail;
} else if (fcntl(sock, F_SETFL, ival | O_NONBLOCK) < 0) {
pptpd_log(_this->self, LOG_ERR,
"fcntl(F_SET_FL) failed at %s(): %m", __func__);
goto fail;
}
if (bind(sock, (struct sockaddr *)&_this->bind_sin,
_this->bind_sin.sin_len) != 0) {
pptpd_log(_this->self, LOG_ERR,
"bind(%s:%u) failed at %s(): %m",
inet_ntoa(_this->bind_sin.sin_addr),
ntohs(_this->bind_sin.sin_port), __func__);
goto fail;
}
if (listen(sock, PPTP_BACKLOG) != 0) {
pptpd_log(_this->self, LOG_ERR,
"listen(%s:%u) failed at %s(): %m",
inet_ntoa(_this->bind_sin.sin_addr),
ntohs(_this->bind_sin.sin_port), __func__);
goto fail;
}
#ifdef NPPPD_FAKEBIND
if (!wildcardbinding)
set_faith(sock, 0);
#endif
pptpd_log(_this->self, LOG_INFO, "Listening %s:%u/tcp (PPTP PAC) [%s]",
inet_ntoa(_this->bind_sin.sin_addr),
ntohs(_this->bind_sin.sin_port), _this->phy_label);
/* GRE */
bind_sin_gre.sin_port = 0;
if ((sock_gre = priv_socket(AF_INET, SOCK_RAW, IPPROTO_GRE)) < 0) {
pptpd_log(_this->self, LOG_ERR, "socket() failed at %s(): %m",
__func__);
goto fail;
}
#ifdef NPPPD_FAKEBIND
if (!wildcardbinding)
set_faith(sock_gre, 1);
#endif
#if defined(IP_STRICT_RCVIF) && defined(USE_STRICT_RCVIF)
ival = 1;
if (setsockopt(sock_gre, IPPROTO_IP, IP_STRICT_RCVIF, &ival,
sizeof(ival)) != 0)
pptpd_log(_this->self, LOG_WARNING,
"%s(): setsockopt(IP_STRICT_RCVIF) failed: %m", __func__);
#endif
#ifdef IP_PIPEX
ival = 1;
if (setsockopt(sock_gre, IPPROTO_IP, IP_PIPEX, &ival, sizeof(ival))
!= 0)
pptpd_log(_this->self, LOG_WARNING,
"%s(): setsockopt(IP_PIPEX) failed: %m", __func__);
#endif
if ((ival = fcntl(sock_gre, F_GETFL, 0)) < 0) {
pptpd_log(_this->self, LOG_ERR,
"fcntl(F_GET_FL) failed at %s(): %m", __func__);
goto fail;
} else if (fcntl(sock_gre, F_SETFL, ival | O_NONBLOCK) < 0) {
pptpd_log(_this->self, LOG_ERR,
"fcntl(F_SET_FL) failed at %s(): %m", __func__);
goto fail;
}
if (bind(sock_gre, (struct sockaddr *)&bind_sin_gre,
bind_sin_gre.sin_len) != 0) {
pptpd_log(_this->self, LOG_ERR,
"bind(%s:%u) failed at %s(): %m",
inet_ntoa(bind_sin_gre.sin_addr),
ntohs(bind_sin_gre.sin_port), __func__);
goto fail;
}
#ifdef NPPPD_FAKEBIND
if (!wildcardbinding)
set_faith(sock_gre, 0);
#endif
if (wildcardbinding) {
#ifdef USE_LIBSOCKUTIL
if (setsockoptfromto(sock) != 0) {
pptpd_log(_this->self, LOG_ERR,
"setsockoptfromto() failed in %s(): %m", __func__);
goto fail;
}
#else
/* nothing to do */
#endif
}
pptpd_log(_this->self, LOG_INFO, "Listening %s:gre (PPTP PAC)",
inet_ntoa(bind_sin_gre.sin_addr));
_this->sock = sock;
_this->sock_gre = sock_gre;
event_set(&_this->ev_sock, _this->sock, EV_READ | EV_PERSIST,
pptpd_io_event, _this);
event_add(&_this->ev_sock, NULL);
event_set(&_this->ev_sock_gre, _this->sock_gre, EV_READ | EV_PERSIST,
pptpd_gre_io_event, _this);
event_add(&_this->ev_sock_gre, NULL);
return 0;
fail:
if (sock >= 0)
close(sock);
if (sock_gre >= 0)
close(sock_gre);
_this->sock = -1;
_this->sock_gre = -1;
return 1;
}
/* start l2tpd listner */
static int
l2tpd_listener_start(l2tpd_listener *_this)
{
l2tpd *_l2tpd;
int af, lvl, opt, sock, ival;
char hbuf[NI_MAXHOST + NI_MAXSERV + 16];
_l2tpd = _this->self;
sock = -1;
af = _this->bind.sin6.sin6_family;
lvl = (af == AF_INET)? IPPROTO_IP : IPPROTO_IPV6;
if (_this->tun_name[0] == '\0')
strlcpy(_this->tun_name, L2TPD_DEFAULT_LAYER2_LABEL,
sizeof(_this->tun_name));
if ((sock = socket(_this->bind.sin6.sin6_family,
SOCK_DGRAM | SOCK_NONBLOCK, IPPROTO_UDP)) < 0) {
l2tpd_log(_l2tpd, LOG_ERR,
"socket() failed in %s(): %m", __func__);
goto fail;
}
#if defined(IP_STRICT_RCVIF) && defined(USE_STRICT_RCVIF)
ival = 1;
if (setsockopt(sock, IPPROTO_IP, IP_STRICT_RCVIF, &ival, sizeof(ival))
!= 0)
l2tpd_log(_l2tpd, LOG_WARNING,
"%s(): setsockopt(IP_STRICT_RCVIF) failed: %m", __func__);
#endif
ival = 1;
if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &ival, sizeof(ival))
!= 0) {
l2tpd_log(_l2tpd, LOG_ERR,
"setsockopt(,,SO_REUSEPORT) failed in %s(): %m", __func__);
goto fail;
}
if (bind(sock, (struct sockaddr *)&_this->bind,
_this->bind.sin6.sin6_len) != 0) {
l2tpd_log(_l2tpd, LOG_ERR, "Binding %s/udp: %m",
addrport_tostring((struct sockaddr *)&_this->bind,
_this->bind.sin6.sin6_len, hbuf, sizeof(hbuf)));
goto fail;
}
#ifdef USE_LIBSOCKUTIL
if (setsockoptfromto(sock) != 0) {
l2tpd_log(_l2tpd, LOG_ERR,
"setsockoptfromto() failed in %s(): %m", __func__);
goto fail;
}
#else
opt = (af == AF_INET)? IP_RECVDSTADDR : IPV6_RECVPKTINFO;
ival = 1;
if (setsockopt(sock, lvl, opt, &ival, sizeof(ival)) != 0) {
l2tpd_log(_l2tpd, LOG_ERR,
"setsockopt(,,IP{,V6}_RECVDSTADDR) failed in %s(): %m",
__func__);
goto fail;
}
#endif
#ifdef USE_SA_COOKIE
if (af == AF_INET) {
ival = 1;
if (setsockopt(sock, IPPROTO_IP, IP_IPSECFLOWINFO, &ival,
sizeof(ival)) != 0) {
l2tpd_log(_l2tpd, LOG_ERR,
"setsockopt(,,IP_IPSECFLOWINFO) failed in %s(): %m",
__func__);
goto fail;
}
}
#endif
#ifdef IP_PIPEX
opt = (af == AF_INET)? IP_PIPEX : IPV6_PIPEX;
ival = 1;
if (setsockopt(sock, lvl, opt, &ival, sizeof(ival)) != 0)
l2tpd_log(_l2tpd, LOG_WARNING,
"%s(): setsockopt(IP{,V6}_PIPEX) failed: %m", __func__);
#endif
if (_this->conf->require_ipsec) {
#ifdef IP_IPSEC_POLICY
caddr_t ipsec_policy_in, ipsec_policy_out;
opt = (af == AF_INET)? IP_IPSEC_POLICY : IPV6_IPSEC_POLICY;
/*
* Note: ipsec_set_policy() will assign the buffer for
* yacc parser stack, however it never free.
* it cause memory leak (-2000byte).
*/
if ((ipsec_policy_in = ipsec_set_policy(L2TPD_IPSEC_POLICY_IN,
strlen(L2TPD_IPSEC_POLICY_IN))) == NULL) {
l2tpd_log(_l2tpd, LOG_ERR,
"ipsec_set_policy(L2TPD_IPSEC_POLICY_IN) failed "
"at %s(): %s: %m", __func__, ipsec_strerror());
} else if (setsockopt(sock, lvl, opt, ipsec_policy_in,
ipsec_get_policylen(ipsec_policy_in)) < 0) {
l2tpd_log(_l2tpd, LOG_WARNING,
"setsockopt(,,IP_IPSEC_POLICY(in)) failed "
"in %s(): %m", __func__);
}
if ((ipsec_policy_out = ipsec_set_policy(L2TPD_IPSEC_POLICY_OUT,
strlen(L2TPD_IPSEC_POLICY_OUT))) == NULL) {
l2tpd_log(_l2tpd, LOG_ERR,
"ipsec_set_policy(L2TPD_IPSEC_POLICY_OUT) failed "
"at %s(): %s: %m", __func__, ipsec_strerror());
}
if (ipsec_policy_out != NULL &&
setsockopt(sock, lvl, opt, ipsec_policy_out,
ipsec_get_policylen(ipsec_policy_out)) < 0) {
l2tpd_log(_l2tpd, LOG_WARNING,
"setsockopt(,,IP_IPSEC_POLICY(out)) failed "
"in %s(): %m", __func__);
}
free(ipsec_policy_in);
free(ipsec_policy_out);
#elif defined(IP_ESP_TRANS_LEVEL)
opt = (af == AF_INET)
? IP_ESP_TRANS_LEVEL : IPV6_ESP_TRANS_LEVEL;
ival = IPSEC_LEVEL_REQUIRE;
if (setsockopt(sock, lvl, opt, &ival, sizeof(ival)) != 0) {
l2tpd_log(_l2tpd, LOG_WARNING,
"setsockopt(,,IP{,V6}_ESP_TRANS_LEVEL(out)) failed "
"in %s(): %m", __func__);
}
#else
#error IP_IPSEC_POLICY or IP_ESP_TRANS_LEVEL must be usable.
#endif
}
_this->sock = sock;
event_set(&_this->ev_sock, _this->sock, EV_READ | EV_PERSIST,
l2tpd_io_event, _this);
event_add(&_this->ev_sock, NULL);
l2tpd_log(_l2tpd, LOG_INFO, "Listening %s/udp (L2TP LNS) [%s]",
addrport_tostring((struct sockaddr *)&_this->bind,
_this->bind.sin6.sin6_len, hbuf, sizeof(hbuf)), _this->tun_name);
return 0;
fail:
if (sock >= 0)
close(sock);
return 1;
}
