/* Authentication (Client side) */
int auth_client(int fd, struct vtun_host *host, int * reason)
{
char buf[VTUN_MESG_SIZE], chal[VTUN_CHAL_SIZE];
int stage, success=0 ;
stage = ST_INIT;
*reason = D_NOREAD;
while( readn_t(fd, buf, VTUN_MESG_SIZE, vtun.timeout) > 0 ){
*reason = D_OTHER;
buf[sizeof(buf)-1]='\0';
switch( stage ){
case ST_INIT:
if (!strncmp(buf, "VTRUNKD", 7)) {
stage = ST_HOST;
print_p(fd,"HOST: %s\n",host->host);
continue;
}
*reason = D_GREET;
break;
case ST_HOST:
if( !strncmp(buf,"OK",2) && cs2cl(buf,chal)){
stage = ST_CHAL;
encrypt_chal(chal,host->passwd);
print_p(fd,"CHAL: %s\n", cl2cs(chal));
continue;
}
*reason = D_CHAL;
break;
case ST_CHAL:
if( !strncmp(buf,"OK",2) && cf2bf(buf,host) )
success = 1;
else *reason = D_PWD;
break;
}
break;
}
return success;
}
/* Authentication (Server side) */
struct vtun_host * auth_server(int fd)
{
char chal_req[VTUN_CHAL_SIZE], chal_res[VTUN_CHAL_SIZE];
char buf[VTUN_MESG_SIZE], *str1, *str2;
struct vtun_host *h = NULL;
char *host = NULL;
int stage;
set_title("authentication");
print_p(fd,"VTUN server ver %s\n",VTUN_VER);
stage = ST_HOST;
while( readn_t(fd, buf, VTUN_MESG_SIZE, vtun.timeout) > 0 ){
buf[sizeof(buf)-1]='\0';
strtok(buf,"\r\n");
if( !(str1=strtok(buf," :")) )
break;
if( !(str2=strtok(NULL," :")) )
break;
switch( stage ){
case ST_HOST:
if( !strcmp(str1,"HOST") ){
host = strdup(str2);
gen_chal(chal_req);
print_p(fd,"OK CHAL: %s\n", cl2cs(chal_req));
stage = ST_CHAL;
continue;
}
break;
case ST_CHAL:
if( !strcmp(str1,"CHAL") ){
if( !cs2cl(str2,chal_res) )
break;
if( !(h = find_host(host)) )
break;
decrypt_chal(chal_res, h->passwd);
if( !memcmp(chal_req, chal_res, VTUN_CHAL_SIZE) ){
/* Auth successeful. */
/* Lock host */
if( lock_host(h) < 0 ){
/* Multiple connections are denied */
h = NULL;
break;
}
print_p(fd,"OK FLAGS: %s\n", bf2cf(h));
} else
h = NULL;
}
break;
}
break;
}
if( host )
free(host);
if( !h )
print_p(fd,"ERR\n");
return h;
}
//add by adonis for multiple interfaces
int udp_session_fs1(struct vtun_host *host) {
struct sockaddr_in saddr;
short port;
int s, opt;
vtun_syslog(LOG_ERR, "in udp_session_fs1");
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
vtun_syslog(LOG_ERR, "Can't create socket");
return -1;
}
opt = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
fcntl(s, F_SETFL, O_NONBLOCK);
/* Set local address and port */
vtun_syslog(LOG_ERR, "in local_addr");
local_addr(&saddr, host, 1);
vtun_syslog(LOG_ERR, "after local_addr");
vtun_syslog(LOG_ERR, "debug %d", host->sport[1]);
vtun_syslog(LOG_ERR, "debug %d, %s", host->sport[1], host->saddr[1].ip);
saddr.sin_port = host->sport[1];
saddr.sin_addr.s_addr = inet_addr(host->saddr[1].ip);
vtun_syslog(LOG_ERR, "before bind");
if (bind(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't bind to the socket %s", strerror(errno));
return -1;
}
opt = sizeof(saddr);
if (getsockname(s, (struct sockaddr *) &saddr, &opt)) {
vtun_syslog(LOG_ERR, "Can't get socket name");
return -1;
}
vtun_syslog(LOG_ERR, "after bind");
/* Write port of the new UDP socket */
port = saddr.sin_port;
if (write_n(host->rmt_fd2, (char *) &port, sizeof(short)) < 0) {
vtun_syslog(LOG_ERR, "Can't write port number");
return -1;
}
host->sopt.lport = htons(port);
vtun_syslog(LOG_ERR, "after port ex send");
/* Read port of the other's end UDP socket */
if (readn_t(host->rmt_fd2, &port, sizeof(short), host->timeout) < 0) {
vtun_syslog(LOG_ERR, "Can't read port number %s", strerror(errno));
return -1;
}
vtun_syslog(LOG_ERR, "after port ex recv");
opt = sizeof(saddr);
if (getpeername(host->rmt_fd2, (struct sockaddr *) &saddr, &opt)) {
vtun_syslog(LOG_ERR, "Can't get peer name");
return -1;
}
saddr.sin_port = port;
if (connect(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't connect socket");
return -1;
}
host->sopt.rport = htons(port);
host->rmt_sock2 = saddr;
/* Close TCP socket and replace with UDP socket */
close(host->rmt_fd2);
host->rmt_fd2 = s;
//add by Kai for multiple interfaces
host->fs[1].saddr = saddr;
host->fs[1].fd = s;
host->fs[1].fd_flag = 1;
//end add
vtun_syslog(LOG_INFO, "UDP 1 connection initialized");
return s;
}
int udp_session(struct vtun_host *host)
{
struct sockaddr_in saddr;
short port;
int s, opt;
extern int is_rmt_fd_connected;
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
vtun_syslog(LOG_ERR, "Can't create socket");
return -1;
}
opt = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
/* Set local address and port */
local_addr(&saddr, host, 1);
if (bind(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't bind to the socket");
return -1;
}
opt = sizeof(saddr);
if (getsockname(s, (struct sockaddr *) &saddr, &opt)) {
vtun_syslog(LOG_ERR, "Can't get socket name");
return -1;
}
/* Write port of the new UDP socket */
port = saddr.sin_port;
if (write_n(host->rmt_fd, (char *) &port, sizeof(short)) < 0) {
vtun_syslog(LOG_ERR, "Can't write port number");
return -1;
}
host->sopt.lport = htons(port);
/* Read port of the other's end UDP socket */
if (readn_t(host->rmt_fd, &port, sizeof(short), host->timeout) < 0) {
vtun_syslog(LOG_ERR, "Can't read port number %s", strerror(errno));
return -1;
}
opt = sizeof(saddr);
if (getpeername(host->rmt_fd, (struct sockaddr *) &saddr, &opt)) {
vtun_syslog(LOG_ERR, "Can't get peer name");
return -1;
}
saddr.sin_port = port;
/* if the config says to delay the UDP connection, we wait for an
incoming packet and then force a connection back. We need to
put this here because we need to keep that incoming triggering
packet and pass it back up the chain. */
if (VTUN_USE_NAT_HACK(host))
is_rmt_fd_connected = 0;
else {
if (connect(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't connect socket");
return -1;
}
is_rmt_fd_connected = 1;
}
host->sopt.rport = htons(port);
/* Close TCP socket and replace with UDP socket */
close(host->rmt_fd);
host->rmt_fd = s;
vtun_syslog(LOG_INFO, "UDP connection initialized");
return s;
}
int udp_session2(struct vtun_host *host) {
struct sockaddr_in saddr;
short port;
int s, opt;
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
vtun_syslog(LOG_ERR, "Can't create socket");
return -1;
}
opt = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
fcntl(s, F_SETFL, O_NONBLOCK);
/* Set local address and port */
local_addr(&saddr, host, 1);
saddr.sin_port = host->sport[0];
saddr.sin_addr.s_addr = inet_addr(host->saddr[0].ip);
if (bind(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't bind to the socket %s", strerror(errno));
return -1;
}
opt = sizeof(saddr);
if (getsockname(s, (struct sockaddr *) &saddr, &opt)) {
vtun_syslog(LOG_ERR, "Can't get socket name");
return -1;
}
/* Write port of the new UDP socket */
port = saddr.sin_port;
if (write_n(host->rmt_fd, (char *) &port, sizeof(short)) < 0) {
vtun_syslog(LOG_ERR, "Can't write port number");
return -1;
}
host->sopt.lport = htons(port);
/* Read port of the other's end UDP socket */
if (readn_t(host->rmt_fd, &port, sizeof(short), host->timeout) < 0) {
vtun_syslog(LOG_ERR, "Can't read port number %s", strerror(errno));
return -1;
}
opt = sizeof(saddr);
if (getpeername(host->rmt_fd, (struct sockaddr *) &saddr, &opt)) {
vtun_syslog(LOG_ERR, "Can't get peer name");
return -1;
}
saddr.sin_port = port;
if (connect(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't connect socket");
return -1;
}
host->sopt.rport = htons(port);
host->rmt_sock = saddr;
/* Close TCP socket and replace with UDP socket */
close(host->rmt_fd);
host->rmt_fd = s;
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
vtun_syslog(LOG_ERR, "Can't create socket2");
return -1;
}
opt = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
fcntl(s, F_SETFL, O_NONBLOCK);
/* Set local address and port */
saddr.sin_port = host->sport[1];
saddr.sin_addr.s_addr = inet_addr(host->saddr[1].ip);
vtun_syslog(LOG_ERR, "address %s:%d", host->saddr[0].ip, host->sport[0]);
vtun_syslog(LOG_ERR, "address %s:%d", host->saddr[1].ip, host->sport[1]);
vtun_syslog(LOG_ERR, "address %s:%d", inet_ntoa(saddr.sin_addr),
ntohs(saddr.sin_port));
if (bind(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't bind to the socket2 (%d:%s)", errno,
strerror(errno));
return -1;
}
saddr.sin_port = host->dport[1];
saddr.sin_addr.s_addr = inet_addr(host->daddr[1].ip);
if (connect(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't connect socket2 ");
return -1;
}
host->rmt_sock2 = saddr;
host->rmt_fd2 = s;
//vtun.rmt_sock2 = saddr;
//vtun.rmt_fd2 = s;
vtun_syslog(LOG_INFO, "UDP connection initialized");
return s;
}
/*
* Establish UDP session with host connected to fd(socket).
* Returns connected UDP socket or -1 on error.
*/
int udp_session(struct vtun_host *host) {
struct sockaddr_in saddr;
short port;
int s, opt;
int buflen = 10;
char buf[10];
char ipstr[INET_ADDRSTRLEN];
vtun_syslog(LOG_INFO, "UDP connection initialized %d,%d", host->rmt_fd,
host->rmt_fd2);
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
vtun_syslog(LOG_ERR, "Can't create socket");
return -1;
}
opt = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
fcntl(s, F_SETFL, O_NONBLOCK);
/* Set local address and port */
local_addr(&saddr, host, 1);
saddr.sin_port = htons(host->sport[0]);
saddr.sin_addr.s_addr = inet_addr(host->saddr[0].ip);
errno = 0;
if (bind(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't bind to the socket %s (%s:%d)",
strerror(errno), host->saddr[0].ip, host->sport[0]);
return -1;
}
opt = sizeof(saddr);
if (getsockname(s, (struct sockaddr *) &saddr, &opt)) {
vtun_syslog(LOG_ERR, "Can't get socket name");
return -1;
}
host->fs[0].saddr = saddr;
/* if we are not just binding port number then we are server*/
if (host->role == 1) {
vtun_syslog(LOG_INFO, "udp_session for server 1");
/* Write port of the new UDP socket */
port = saddr.sin_port;
if (write_n(host->rmt_fd, (char *) &port, sizeof(short)) < 0) {
vtun_syslog(LOG_ERR, "Can't write port number");
return -1;
}
vtun_syslog(LOG_INFO, "Waiting for UDP ACK 1, wrote port %d", port);
opt = sizeof(saddr);
while (recvfrom(s, (char *) &port, sizeof(short), 0,
(struct sockaddr *) &saddr, &opt) <= 0)
;
vtun_syslog(LOG_INFO, "UDP ACK 1 from %s:%d",
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
host->fs[0].daddr.sin_family = saddr.sin_family;
host->fs[0].daddr.sin_port = saddr.sin_port;
host->fs[0].daddr.sin_addr.s_addr = saddr.sin_addr.s_addr;
inet_ntop(AF_INET, &(host->fs[0].daddr.sin_addr), ipstr,
INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, "%s:%d", ipstr,
ntohs(host->fs[0].daddr.sin_port));
if (connect(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't connect socket");
return -1;
}
write_n(s, (char *) &port, sizeof(short));
vtun_syslog(LOG_INFO, "FINAL ACK SENT 1");
} else {
//vtun_syslog(LOG_INFO,"udp_session for client 1");
/* Read port of the other's end UDP socket */
if (readn_t(host->rmt_fd, (char *) &port, sizeof(short), host->timeout)
< 0) {
vtun_syslog(LOG_ERR, "Can't read port number %s", strerror(errno));
return -1;
}
vtun_syslog(LOG_INFO, "Recieved port %d info from server 1", port);
opt = sizeof(saddr);
if (getpeername(host->rmt_fd, (struct sockaddr *) &saddr, &opt)) {
vtun_syslog(LOG_ERR, "Can't get peer name");
return -1;
}
saddr.sin_port = port;
sendto(s, (char *) &port, sizeof(short), 0, (struct sockaddr *) &saddr,
opt);
vtun_syslog(LOG_INFO, "Sent ACK on UDP 1");
host->fs[0].daddr = saddr;
if (connect(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't connect socket");
return -1;
}
read_n(s, (char *) &port, sizeof(short));
vtun_syslog(LOG_INFO, "Connected & Recived final ACK 1");
}
/* Why we need this ??*/
host->sopt.rport = htons(port);
host->rmt_sock = saddr;
/* Close TCP socket and replace with UDP socket */
close(host->rmt_fd);
host->rmt_fd = s;
//add by Kai for multiple interfaces
// host->fs[0].daddr = saddr;
host->fs[0].fd = s;
host->fs[0].fd_flag = 1;
s = 0;
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
vtun_syslog(LOG_ERR, "Can't create socket");
return -1;
}
opt = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
fcntl(s, F_SETFL, O_NONBLOCK);
/* Set local address and port */
local_addr(&saddr, host, 1);
saddr.sin_port = htons(host->sport[1]);
saddr.sin_addr.s_addr = inet_addr(host->saddr[1].ip);
if (bind(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't bind to the socket");
return -1;
}
opt = sizeof(saddr);
if (getsockname(s, (struct sockaddr *) &saddr, &opt)) {
vtun_syslog(LOG_ERR, "Can't get socket name");
return -1;
}
host->fs[1].saddr = saddr;
/* if we are not just binding port number then we are server*/
//if(saddr.sin_addr.s_addr == inet_addr("0.0.0.0")){
if (host->role == 1) {
vtun_syslog(LOG_INFO, "udp_session for server 2");
/* Write port of the new UDP socket */
port = saddr.sin_port;
if (write_n(host->rmt_fd2, (char *) &port, sizeof(short)) < 0) {
vtun_syslog(LOG_ERR, "Can't write port number");
return -1;
}
vtun_syslog(LOG_INFO, "Waiting for UDP ACK 2 wrote port %d", port);
opt = sizeof(saddr);
while (recvfrom(s, (char *) &port, sizeof(short), 0,
(struct sockaddr *) &saddr, &opt) <= 0)
;
vtun_syslog(LOG_INFO, "UDP ACK 2 from %s:%d",
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
host->fs[1].daddr.sin_family = saddr.sin_family;
host->fs[1].daddr.sin_port = saddr.sin_port;
host->fs[1].daddr.sin_addr.s_addr = saddr.sin_addr.s_addr;
inet_ntop(AF_INET, &(host->fs[1].daddr.sin_addr), ipstr,
INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, "%s:%d", ipstr,
ntohs(host->fs[1].daddr.sin_port));
if (connect(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't connect socket");
return -1;
}
write_n(s, (char *) &port, sizeof(short));
vtun_syslog(LOG_INFO, "FINAL ACK SENT 2");
} else {
vtun_syslog(LOG_INFO, "udp_session for client 2");
/* Read port of the other's end UDP socket */
if (readn_t(host->rmt_fd2, (char *) &port, sizeof(short), host->timeout)
< 0) {
vtun_syslog(LOG_ERR, "Can't read port number %s", strerror(errno));
return -1;
}
opt = sizeof(saddr);
if (getpeername(host->rmt_fd2, (struct sockaddr *) &saddr, &opt)) {
vtun_syslog(LOG_ERR, "Can't get peer name");
return -1;
}
saddr.sin_port = port;
vtun_syslog(LOG_INFO, "Recieved port %d info from server 2", port);
sendto(s, (char *) &port, sizeof(short), 0, (struct sockaddr *) &saddr,
opt);
host->fs[1].daddr = saddr;
if (connect(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't connect socket");
return -1;
}
read_n(s, (char *) &port, sizeof(short));
vtun_syslog(LOG_INFO, "Connected & Recived final ACK 2");
}
host->rmt_sock2 = saddr;
/* Close TCP socket and replace with UDP socket */
close(host->rmt_fd2);
host->rmt_fd2 = s;
//add by Kai for multiple interfaces
host->fs[1].fd = s;
host->fs[1].fd_flag = 1;
inet_ntop(AF_INET, &(host->fs[0].saddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, " fd is %s:%d ->", ipstr,
ntohs(host->fs[0].saddr.sin_port));
inet_ntop(AF_INET, &(host->fs[0].daddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, " fd is %s:%d <-", ipstr,
ntohs(host->fs[0].daddr.sin_port));
inet_ntop(AF_INET, &(host->fs[1].saddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, " fd is %s:%d ->", ipstr,
ntohs(host->fs[1].saddr.sin_port));
inet_ntop(AF_INET, &(host->fs[1].daddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, " fd is %s:%d <-", ipstr,
ntohs(host->fs[1].daddr.sin_port));
host->fs[0].saddr.sin_port = htons(4444);
host->fs[0].daddr.sin_port = htons(4444);
host->fs[1].saddr.sin_port = htons(4444);
host->fs[1].daddr.sin_port = htons(4444);
/*
host->fs[0].saddr.sin_port = htons(host->dport[1]+10);
host->fs[0].daddr.sin_port = htons(host->dport[1]+10);
host->fs[1].saddr.sin_port = htons(host->dport[1]+10);
host->fs[1].daddr.sin_port = htons(host->dport[1]+10);
*/
inet_ntop(AF_INET, &(host->fs[0].saddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, " fd is %s:%d ->", ipstr,
ntohs(host->fs[0].saddr.sin_port));
inet_ntop(AF_INET, &(host->fs[0].daddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, " fd is %s:%d <-", ipstr,
ntohs(host->fs[0].daddr.sin_port));
inet_ntop(AF_INET, &(host->fs[1].saddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, " fd is %s:%d ->", ipstr,
ntohs(host->fs[1].saddr.sin_port));
inet_ntop(AF_INET, &(host->fs[1].daddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, " fd is %s:%d <-", ipstr,
ntohs(host->fs[1].daddr.sin_port));
vtun_syslog(LOG_INFO, "UDP connection initialized");
return s;
}
int fetch_server_data(struct vtun_host *host, int i, int j) {
struct sockaddr_in saddr;
short port;
int s, opt;
int buflen = 10;
char buf[10];
char ipstr[INET_ADDRSTRLEN];
opt = sizeof(saddr);
vtun_syslog(LOG_ERR, "Wait for response from client on Control");
/*Wait for response from client on Control*/
while (recvfrom(host->ctrl, (char *) &port, sizeof(short), 0,
(struct sockaddr *) &saddr, &opt) <= 0)
;
inet_ntop(AF_INET, &(saddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, "recvfrom %s:%d", ipstr, ntohs(saddr.sin_port));
/*Open a UDP socket*/
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
vtun_syslog(LOG_ERR, "Can't create socket");
return -1;
}
opt = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
fcntl(s, F_SETFL, O_NONBLOCK);
saddr.sin_family = AF_INET;
saddr.sin_port = htons(host->sport[i]);
vtun_syslog(LOG_INFO, "trying to bind");
vtun_syslog(LOG_INFO, "%d %s", i, host->saddr[i].ip);
saddr.sin_addr.s_addr = inet_addr(host->saddr[i].ip);
vtun_syslog(LOG_ERR, "Binding with %s", host->saddr[i].ip);
/*Bind a port*/
if (bind(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't bind to the socket");
host->fs[i].fd_flag = 0;
return -1;
}
host->fs[i].saddr = saddr;
inet_ntop(AF_INET, &(host->fs[i].saddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, "saddr %s:%d", ipstr, ntohs(saddr.sin_port));
opt = sizeof(saddr);
if (getsockname(s, (struct sockaddr *) &saddr, &opt)) {
vtun_syslog(LOG_ERR, "Can't get socket name");
return -1;
}
port = saddr.sin_port;
vtun_syslog(LOG_ERR, "Send port number to Client on Control");
/*Send port number to Client on Control*/
opt = sizeof(host->fs[j].daddr);
saddr = host->fs[j].daddr;
saddr.sin_port = htons(host->ctrl_port);
inet_ntop(AF_INET, &(saddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, "%s:%d", ipstr, ntohs(saddr.sin_port));
inet_ntop(AF_INET, &(host->fs[j].saddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, "%s:%d", ipstr, ntohs(host->fs[j].saddr.sin_port));
errno = 0;
sendfromto(host->ctrl, (char *) &port, sizeof(short), 0,
(struct sockaddr *) &host->fs[j].saddr, opt,
(struct sockaddr *) &saddr, opt);
/*Wait for PING on new Data Path*/
vtun_syslog(LOG_ERR, "Wait for PING on new Control Path %s port %d",
strerror(errno), port);
while (recvfrom(s, (char *) &port, sizeof(short), 0,
(struct sockaddr *) &saddr, &opt) <= 0)
;
host->fs[i].daddr = saddr;
if (connect(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't connect socket");
return -1;
}
host->fs[i].fd_flag = 1;
host->fs[i].fd = s;
port = 0;
errno = 0;
vtun_syslog(LOG_ERR, "Sent PONG on new Control Path");
write_n(host->fs[i].fd, (char*) &port, sizeof(short));
vtun_syslog(LOG_ERR, "WAIT PONG on new Control Path %s", strerror(errno));
while (readn_t(host->fs[i].fd, (char*) &port, sizeof(short), host->timeout)
< 0)
;
vtun_syslog(LOG_ERR, "%s", strerror(errno));
/*SEND END_OF_REG*/
return 0;
}
int fetch_control(struct vtun_host * host) {
struct sockaddr_in saddr;
short port;
int s, opt;
int buflen = 10;
char buf[10];
char ipstr[INET_ADDRSTRLEN];
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
vtun_syslog(LOG_ERR, "Can't create socket");
return -1;
}
opt = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
fcntl(s, F_SETFL, O_NONBLOCK);
/* Set local address and port */
saddr.sin_family = AF_INET;
saddr.sin_port = htons(host->ctrl_port);
saddr.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(s, (struct sockaddr *) &saddr, sizeof(saddr))) {
vtun_syslog(LOG_ERR, "Can't bind to the socket");
return -1;
}
opt = sizeof(saddr);
if (getsockname(host->rmt_fd, (struct sockaddr *) &saddr, &opt)) {
vtun_syslog(LOG_ERR, "Can't get socket name");
return -1;
}
host->fs[0].saddr = saddr;
if (getsockname(s, (struct sockaddr *) &saddr, &opt)) {
vtun_syslog(LOG_ERR, "Can't get socket name");
return -1;
}
/* if we are not just binding port number then we are server*/
if (host->role == 1) {
vtun_syslog(LOG_INFO, "udp_ctrl_session for server");
/* Write port of the new UDP socket */
port = saddr.sin_port;
if (write_n(host->rmt_fd, (char *) &port, sizeof(short)) < 0) {
vtun_syslog(LOG_ERR, "Can't write port number");
return -1;
}
vtun_syslog(LOG_INFO, "Waiting for UDP ACK 1, wrote port %d", port);
opt = sizeof(saddr);
while (recvfrom(s, (char *) &port, sizeof(short), 0,
(struct sockaddr *) &saddr, &opt) <= 0)
;
vtun_syslog(LOG_INFO, "UDP ACK 1 from %s:%d",
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
host->fs[0].daddr.sin_family = saddr.sin_family;
host->fs[0].daddr.sin_port = saddr.sin_port;
host->fs[0].daddr.sin_addr.s_addr = saddr.sin_addr.s_addr;
inet_ntop(AF_INET, &(host->fs[0].daddr.sin_addr), ipstr,
INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, "%s:%d", ipstr,
ntohs(host->fs[0].daddr.sin_port));
//sendto(s,(char *)&port,sizeof(short),0,(struct sockaddr *)&saddr,opt);
errno = 0;
sendfromto(s, (char *) &port, sizeof(short), 0,
(struct sockaddr *) &host->fs[0].saddr, opt,
(struct sockaddr *) &saddr, opt);
vtun_syslog(LOG_INFO, "FINAL ACK SENT 1 %s", strerror(errno));
inet_ntop(AF_INET, &(saddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, "%s:%d", ipstr, ntohs(saddr.sin_port));
host->ctrl_port = ntohs(saddr.sin_port);
} else {
//vtun_syslog(LOG_INFO,"udp_session for client 1");
/* Read port of the other's end UDP socket */
if (readn_t(host->rmt_fd, (char *) &port, sizeof(short), host->timeout)
< 0) {
vtun_syslog(LOG_ERR, "Can't read port number %s", strerror(errno));
return -1;
}
vtun_syslog(LOG_INFO, "Recieved port %d info from server 1", port);
opt = sizeof(saddr);
if (getpeername(host->rmt_fd, (struct sockaddr *) &saddr, &opt)) {
vtun_syslog(LOG_ERR, "Can't get peer name");
return -1;
}
saddr.sin_port = port;
inet_ntop(AF_INET, &(saddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, "%s:%d", ipstr, ntohs(saddr.sin_port));
inet_ntop(AF_INET, &(host->fs[0].saddr.sin_addr), ipstr,
INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, "%s:%d", ipstr,
ntohs(host->fs[0].saddr.sin_port));
errno = 0;
sendfromto(s, (char *) &port, sizeof(short), 0,
(struct sockaddr *) &host->fs[0].saddr, opt,
(struct sockaddr *) &saddr, opt);
vtun_syslog(LOG_INFO, "Sent ACK on UDP 1 :%s", strerror(errno));
host->fs[0].daddr = saddr;
while (recvfrom(s, (char *) &port, sizeof(short), 0,
(struct sockaddr *) &saddr, &opt) <= 0)
;
vtun_syslog(LOG_INFO, "Connected & Recived final ACK 1");
inet_ntop(AF_INET, &(saddr.sin_addr), ipstr, INET_ADDRSTRLEN);
vtun_syslog(LOG_INFO, "%s:%d", ipstr, ntohs(saddr.sin_port));
host->ctrl_port = ntohs(saddr.sin_port);
}
return s;
}
/*
* Establish UDP session with host connected to fd(socket).
* Returns connected UDP socket or -1 on error.
*/
int udp_session(struct vtun_host *host)
{
struct sockaddr_in saddr;
short port;
int s,opt;
if( (s=socket(AF_INET,SOCK_DGRAM,0))== -1 ){
vtun_syslog(LOG_ERR,"Can't create socket");
return -1;
}
opt=1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
/* Set local address and port */
local_addr(&saddr, host, 1);
if( bind(s,(struct sockaddr *)&saddr,sizeof(saddr)) ){
vtun_syslog(LOG_ERR,"Can't bind to the socket");
return -1;
}
opt = sizeof(saddr);
if( getsockname(s,(struct sockaddr *)&saddr,&opt) ){
vtun_syslog(LOG_ERR,"Can't get socket name");
return -1;
}
/* Write port of the new UDP socket */
port = saddr.sin_port;
if( write_n(host->rmt_fd,(char *)&port,sizeof(short)) < 0 ){
vtun_syslog(LOG_ERR,"Can't write port number");
return -1;
}
host->sopt.lport = htons(port);
/* Read port of the other's end UDP socket */
if( readn_t(host->rmt_fd,&port,sizeof(short),host->timeout) < 0 ){
vtun_syslog(LOG_ERR,"Can't read port number %s", strerror(errno));
return -1;
}
opt = sizeof(saddr);
if( getpeername(host->rmt_fd,(struct sockaddr *)&saddr,&opt) ){
vtun_syslog(LOG_ERR,"Can't get peer name");
return -1;
}
saddr.sin_port = port;
if( connect(s,(struct sockaddr *)&saddr,sizeof(saddr)) ){
vtun_syslog(LOG_ERR,"Can't connect socket");
return -1;
}
host->sopt.rport = htons(port);
/* Close TCP socket and replace with UDP socket */
close(host->rmt_fd);
host->rmt_fd = s;
vtun_syslog(LOG_INFO,"UDP connection initialized");
return s;
}