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main.c
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#include "main.h"
#include "client.h"
#include "tox_bootstrap.h"
#include "log.h"
#ifdef __MACH__
#include "mach.h"
#endif
static struct Tox_Options tox_options;
Tox *tox;
int client_socket = 0;
TOX_CONNECTION connection_status = TOX_CONNECTION_NONE;
/** CONFIGURATION OPTIONS **/
/* Whether we're a client */
int client_mode = 0;
/* Just send a ping and exit */
int ping_mode = 0;
/* Open a local port and forward it */
int client_local_port_mode = 0;
/* Forward stdin/stdout to remote machine - SSH ProxyCommand mode */
int client_pipe_mode = 0;
/* Remote Tox ID in client mode */
char *remote_tox_id = NULL;
/* Directory with config and tox save */
char config_path[500] = "/etc/tuntox/";
/* Ports and hostname for port forwarding */
int remote_port = 0;
char *remote_host = NULL;
int local_port = 0;
/* Whether to daemonize/fork after startup */
int daemonize = 0;
/* Path to the pidfile */
char *pidfile = NULL;
/* Username to which we suid() in daemon mode */
char *daemon_username = NULL;
/* Shared secret used for authentication */
int use_shared_secret = 0;
char shared_secret[TOX_MAX_FRIEND_REQUEST_LENGTH];
fd_set master_server_fds;
/* We keep two hash tables: one indexed by sockfd and another by "connection id" */
tunnel *by_id = NULL;
/* Highest used fd + 1 for select() */
int select_nfds = 4;
/* Generate an unique tunnel ID. To be used in a server. */
uint16_t get_random_tunnel_id()
{
while(1)
{
int key;
uint16_t tunnel_id;
tunnel *tun;
tunnel_id = (uint16_t)rand();
key = tunnel_id;
HASH_FIND_INT(by_id, &key, tun);
if(!tun)
{
return tunnel_id;
}
log_printf(L_WARNING, "[i] Found duplicated tunnel ID %d\n", key);
}
}
void update_select_nfds(int fd)
{
/* TODO maybe replace with a scan every time to make select() more efficient in the long run? */
if(fd + 1 > select_nfds)
{
select_nfds = fd + 1;
}
}
/* Constructor. Returns NULL on failure. */
tunnel *tunnel_create(int sockfd, int connid, uint32_t friendnumber)
{
tunnel *t = NULL;
t = calloc(1, sizeof(tunnel));
if(!t)
{
return NULL;
}
t->sockfd = sockfd;
t->connid = connid;
t->friendnumber = friendnumber;
log_printf(L_INFO, "Created a new tunnel object connid=%d sockfd=%d\n", connid, sockfd);
update_select_nfds(t->sockfd);
HASH_ADD_INT( by_id, connid, t );
return t;
}
void tunnel_delete(tunnel *t)
{
log_printf(L_INFO, "Deleting tunnel #%d\n", t->connid);
if(t->sockfd)
{
close(t->sockfd);
}
HASH_DEL( by_id, t );
free(t);
}
/* bootstrap to dht with bootstrap_nodes */
/* From uTox/tox.c */
static void do_bootstrap(Tox *tox)
{
static unsigned int j = 0;
if (j == 0)
j = rand();
int i = 0;
while(i < 4) {
struct bootstrap_node *d = &bootstrap_nodes[j % countof(bootstrap_nodes)];
tox_bootstrap(tox, d->address, d->port, d->key, 0);
tox_add_tcp_relay(tox, d->address, d->port, d->key, 0);
i++;
j++;
}
}
/* Set username to the machine's FQDN */
void set_tox_username(Tox *tox)
{
unsigned char hostname[1024];
struct addrinfo hints, *info, *p;
int gai_result;
TOX_ERR_SET_INFO error;
gethostname(hostname, 1024);
hostname[1023] = '\0';
tox_self_set_name(tox, hostname, strlen(hostname), &error);
if(error != TOX_ERR_SET_INFO_OK)
{
log_printf(L_DEBUG, "tox_self_set_name() failed (%u)", error);
}
}
/* Get sockaddr, IPv4 or IPv6 */
void *get_in_addr(struct sockaddr *sa)
{
if (sa->sa_family == AF_INET)
{
return &(((struct sockaddr_in*)sa)->sin_addr);
}
return &(((struct sockaddr_in6*)sa)->sin6_addr);
}
int get_client_socket(char *hostname, int port)
{
int sockfd, numbytes;
char buf[READ_BUFFER_SIZE];
struct addrinfo hints, *servinfo, *p;
int rv;
char s[INET6_ADDRSTRLEN];
char port_str[6];
snprintf(port_str, 6, "%d", port);
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
if ((rv = getaddrinfo(hostname, port_str, &hints, &servinfo)) != 0)
{
/* Add a special case for "localhost" when name resolution is broken */
if(!strncmp("localhost", hostname, 256))
{
const char localhostname[] = "127.0.0.1";
if ((rv = getaddrinfo(localhostname, port_str, &hints, &servinfo)) != 0) {
log_printf(L_WARNING, "getaddrinfo failed for 127.0.0.1: %s\n", gai_strerror(rv));
return -1;
}
}
else
{
log_printf(L_WARNING, "getaddrinfo: %s\n", gai_strerror(rv));
return -1;
}
}
// loop through all the results and connect to the first we can
for(p = servinfo; p != NULL; p = p->ai_next)
{
if (p->ai_family != AF_INET && p->ai_family != AF_INET6)
continue;
if ((sockfd = socket(p->ai_family, p->ai_socktype,
p->ai_protocol)) == -1) {
perror("client: socket");
continue;
}
if (connect(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
close(sockfd);
perror("client: connect");
continue;
}
break;
}
if (p == NULL) {
log_printf(L_WARNING, "failed to connect to %s:%d\n", hostname, port);
freeaddrinfo(servinfo);
return -1;
}
inet_ntop(p->ai_family, get_in_addr((struct sockaddr *)p->ai_addr), s, sizeof s);
log_printf(L_DEBUG, "connecting to %s\n", s);
freeaddrinfo(servinfo); // all done with this structure
log_printf(L_DEBUG, "Connected to %s:%d\n", hostname, port);
return sockfd;
}
/* Proto - our protocol handling */
/*
* send_frame: (almost) zero-copy. Overwrites first PROTOCOL_BUFFER_OFFSET bytes of data
* so actual data should start at position PROTOCOL_BUFFER_OFFSET
*/
int send_frame(protocol_frame *frame, uint8_t *data)
{
int rv = -1;
int try = 0;
int i;
TOX_ERR_FRIEND_CUSTOM_PACKET custom_packet_error;
data[0] = PROTOCOL_MAGIC_HIGH;
data[1] = PROTOCOL_MAGIC_LOW;
data[2] = BYTE2(frame->packet_type);
data[3] = BYTE1(frame->packet_type);
data[4] = BYTE2(frame->connid);
data[5] = BYTE1(frame->connid);
data[6] = BYTE2(frame->data_length);
data[7] = BYTE1(frame->data_length);
for(i = 0; i < 65;) /* 1.27 seconds per packet max */
{
int j;
try++;
rv = tox_friend_send_lossless_packet(
tox,
frame->friendnumber,
data,
frame->data_length + PROTOCOL_BUFFER_OFFSET,
&custom_packet_error
);
if(custom_packet_error == TOX_ERR_FRIEND_CUSTOM_PACKET_OK)
{
break;
}
else
{
/* If this branch is ran, most likely we've hit congestion control. */
if(custom_packet_error == TOX_ERR_FRIEND_CUSTOM_PACKET_SENDQ)
{
log_printf(L_DEBUG, "[%d] Failed to send packet to friend %d (Packet queue is full)\n", i, frame->friendnumber, custom_packet_error);
}
else
{
log_printf(L_DEBUG, "[%d] Failed to send packet to friend %d (err: %u)\n", i, frame->friendnumber, custom_packet_error);
}
}
if(i == 0) i = 2;
else i = i * 2;
for(j = 0; j < i; j++)
{
tox_iterate(tox);
usleep(j * 10000);
}
}
if(i > 0 && rv >= 0)
{
log_printf(L_DEBUG, "Packet succeeded at try %d\n", try);
}
return rv;
}
int send_tunnel_ack_frame(tunnel *tun)
{
protocol_frame frame_st;
protocol_frame *frame;
char data[PROTOCOL_BUFFER_OFFSET];
frame = &frame_st;
memset(frame, 0, sizeof(protocol_frame));
frame->packet_type = PACKET_TYPE_ACKTUNNEL;
frame->connid = tun->connid;
frame->data_length = 0;
frame->friendnumber = tun->friendnumber;
return send_frame(frame, data);
}
int handle_ping_frame(protocol_frame *rcvd_frame)
{
uint8_t data[TOX_MAX_CUSTOM_PACKET_SIZE];
protocol_frame frame_s;
protocol_frame *frame = &frame_s;
frame->data = data + PROTOCOL_BUFFER_OFFSET;
memcpy(frame->data, rcvd_frame->data, rcvd_frame->data_length);
frame->friendnumber = rcvd_frame->friendnumber;
frame->packet_type = PACKET_TYPE_PONG;
frame->data_length = rcvd_frame->data_length;
send_frame(frame, data);
return 0;
}
int handle_request_tunnel_frame(protocol_frame *rcvd_frame)
{
char *hostname = NULL;
tunnel *tun;
int port = -1;
int sockfd = 0;
uint16_t tunnel_id;
if(client_mode)
{
log_printf(L_WARNING, "Got tunnel request frame from friend #%d when in client mode\n", rcvd_frame->friendnumber);
return -1;
}
port = rcvd_frame->connid;
hostname = calloc(1, rcvd_frame->data_length + 1);
if(!hostname)
{
log_printf(L_ERROR, "Could not allocate memory for tunnel request hostname\n");
return -1;
}
strncpy(hostname, rcvd_frame->data, rcvd_frame->data_length);
hostname[rcvd_frame->data_length] = '\0';
log_printf(L_INFO, "Got a request to forward data from %s:%d\n", hostname, port);
tunnel_id = get_random_tunnel_id();
log_printf(L_DEBUG, "Tunnel ID: %d\n", tunnel_id);
sockfd = get_client_socket(hostname, port);
if(sockfd > 0)
{
tun = tunnel_create(sockfd, tunnel_id, rcvd_frame->friendnumber);
if(tun)
{
FD_SET(sockfd, &master_server_fds);
update_select_nfds(sockfd);
log_printf(L_DEBUG, "Created tunnel, yay!\n");
send_tunnel_ack_frame(tun);
}
else
{
log_printf(L_ERROR, "Couldn't allocate memory for tunnel\n");
close(sockfd);
}
}
else
{
log_printf(L_WARNING, "Could not connect to %s:%d\n", hostname, port);
/* TODO send reject */
}
free(hostname);
return 0;
}
/* Handle a TCP frame received from client */
int handle_client_tcp_frame(protocol_frame *rcvd_frame)
{
tunnel *tun=NULL;
int offset = 0;
int connid = rcvd_frame->connid;
HASH_FIND_INT(by_id, &connid, tun);
if(!tun)
{
log_printf(L_WARNING, "Got TCP frame with unknown tunnel ID %d\n", rcvd_frame->connid);
return -1;
}
if(tun->friendnumber != rcvd_frame->friendnumber)
{
log_printf(L_WARNING, "Friend #%d tried to send packet to a tunnel which belongs to #%d\n", rcvd_frame->friendnumber, tun->friendnumber);
return -1;
}
while(offset < rcvd_frame->data_length)
{
int sent_bytes;
sent_bytes = send(
tun->sockfd,
rcvd_frame->data + offset,
rcvd_frame->data_length - offset,
MSG_NOSIGNAL
);
if(sent_bytes < 0)
{
log_printf(L_WARNING, "Could not write to socket %d: %s\n", tun->sockfd, strerror(errno));
return -1;
}
offset += sent_bytes;
}
return 0;
}
/* Handle close-tunnel frame received from the client */
int handle_client_tcp_fin_frame(protocol_frame *rcvd_frame)
{
tunnel *tun=NULL;
int offset = 0;
int connid = rcvd_frame->connid;
HASH_FIND_INT(by_id, &connid, tun);
if(!tun)
{
log_printf(L_WARNING, "Got TCP FIN frame with unknown tunnel ID %d\n", rcvd_frame->connid);
return -1;
}
if(tun->friendnumber != rcvd_frame->friendnumber)
{
log_printf(L_WARNING, "Friend #%d tried to close tunnel which belongs to #%d\n", rcvd_frame->friendnumber, tun->friendnumber);
return -1;
}
tunnel_delete(tun);
return 0;
}
/* This is a dispatcher for our encapsulated protocol */
int handle_frame(protocol_frame *frame)
{
switch(frame->packet_type)
{
case PACKET_TYPE_PING:
return handle_ping_frame(frame);
break;
case PACKET_TYPE_PONG:
return handle_pong_frame(frame);
break;
case PACKET_TYPE_TCP:
if(client_mode)
{
return handle_server_tcp_frame(frame);
}
else
{
return handle_client_tcp_frame(frame);
}
break;
case PACKET_TYPE_REQUESTTUNNEL:
handle_request_tunnel_frame(frame);
break;
case PACKET_TYPE_ACKTUNNEL:
handle_acktunnel_frame(frame);
break;
case PACKET_TYPE_TCP_FIN:
if(client_mode)
{
return handle_server_tcp_fin_frame(frame);
}
else
{
return handle_client_tcp_fin_frame(frame);
}
break;
default:
log_printf(L_DEBUG, "Got unknown packet type 0x%x from friend %d\n",
frame->packet_type,
frame->friendnumber
);
}
return 0;
}
/*
* This is a callback which gets a packet from Tox core.
* It checks for basic inconsistiencies and allocates the
* protocol_frame structure.
*/
void parse_lossless_packet(Tox *tox, uint32_t friendnumber, const uint8_t *data, size_t len, void *tmp)
{
protocol_frame *frame = NULL;
if(len < PROTOCOL_BUFFER_OFFSET)
{
log_printf(L_WARNING, "Received too short data frame - only %d bytes, at least %d expected\n", len, PROTOCOL_BUFFER_OFFSET);
return;
}
if(!data)
{
log_printf(L_ERROR, "Got NULL pointer from toxcore - WTF?\n");
return;
}
if(data[0] != PROTOCOL_MAGIC_HIGH || data[1] != PROTOCOL_MAGIC_LOW)
{
log_printf(L_WARNING, "Received data frame with invalid protocol magic number 0x%x%x\n", data[0], data[1]);
return;
}
frame = calloc(1, sizeof(protocol_frame));
if(!frame)
{
log_printf(L_ERROR, "Could not allocate memory for protocol_frame_t\n");
return;
}
/* TODO check if friendnumber is the same in sender and connid tunnel*/
frame->magic = INT16_AT(data, 0);
frame->packet_type = INT16_AT(data, 2);
frame->connid = INT16_AT(data, 4);
frame->data_length = INT16_AT(data, 6);
frame->data = (uint8_t *)(data + PROTOCOL_BUFFER_OFFSET);
frame->friendnumber = friendnumber;
log_printf(L_DEBUG, "Got protocol frame magic 0x%x type 0x%x from friend %d\n", frame->magic, frame->packet_type, frame->friendnumber);
if(len < frame->data_length + PROTOCOL_BUFFER_OFFSET)
{
log_printf(L_WARNING, "Received frame too small (attempted buffer overflow?): %d bytes, excepted at least %d bytes\n", len, frame->data_length + PROTOCOL_BUFFER_OFFSET);
free(frame);
return;
}
if(frame->data_length > (TOX_MAX_CUSTOM_PACKET_SIZE - PROTOCOL_BUFFER_OFFSET))
{
log_printf(L_WARNING, "Declared data length too big (attempted buffer overflow?): %d bytes, excepted at most %d bytes\n", frame->data_length, (TOX_MAX_CUSTOM_PACKET_SIZE - PROTOCOL_BUFFER_OFFSET));
free(frame);
return;
}
handle_frame(frame);
}
int send_tunnel_request_packet(char *remote_host, int remote_port, int friend_number)
{
int packet_length = 0;
protocol_frame frame_i, *frame;
char *data = NULL;
log_printf(L_INFO, "Sending packet to friend #%d to forward %s:%d\n", friend_number, remote_host, remote_port);
packet_length = PROTOCOL_BUFFER_OFFSET + strlen(remote_host);
frame = &frame_i;
data = calloc(1, packet_length);
if(!data)
{
log_printf(L_ERROR, "Could not allocate memory for tunnel request packet\n");
exit(1);
}
strcpy(data+PROTOCOL_BUFFER_OFFSET, remote_host);
frame->friendnumber = friend_number;
frame->packet_type = PACKET_TYPE_REQUESTTUNNEL;
frame->connid = remote_port;
frame->data_length = strlen(remote_host);
send_frame(frame, data);
free(data);
return 0;
}
/* End proto */
/* Save tox identity to a file */
static void write_save(Tox *tox)
{
void *data;
uint32_t size;
uint8_t path_tmp[512], path_real[512], *p;
FILE *file;
size = tox_get_savedata_size(tox);
data = malloc(size);
tox_get_savedata(tox, data);
strncpy(path_real, config_path, sizeof(config_path));
p = path_real + strlen(path_real);
memcpy(p, "tox_save", sizeof("tox_save"));
unsigned int path_len = (p - path_real) + sizeof("tox_save");
memcpy(path_tmp, path_real, path_len);
memcpy(path_tmp + (path_len - 1), ".tmp", sizeof(".tmp"));
file = fopen((char*)path_tmp, "wb");
if(file) {
fwrite(data, size, 1, file);
fflush(file);
fclose(file);
if (rename((char*)path_tmp, (char*)path_real) != 0) {
log_printf(L_WARNING, "Failed to rename file. %s to %s deleting and trying again\n", path_tmp, path_real);
if(remove((const char *)path_real) < 0) {
log_printf(L_WARNING, "Failed to remove old save file %s\n", path_real);
}
if (rename((char*)path_tmp, (char*)path_real) != 0) {
log_printf(L_WARNING, "Saving Failed\n");
} else {
log_printf(L_DEBUG, "Saved data\n");
}
} else {
log_printf(L_DEBUG, "Saved data\n");
}
}
else
{
log_printf(L_WARNING, "Could not open save file\n");
}
free(data);
}
/* Load tox identity from a file */
static size_t load_save(uint8_t **out_data)
{
void *data;
uint32_t size;
uint8_t path_tmp[512], path_real[512], *p;
FILE *file;
strncpy(path_real, config_path, sizeof(config_path));
p = path_real + strlen(path_real);
memcpy(p, "tox_save", sizeof("tox_save"));
unsigned int path_len = (p - path_real) + sizeof("tox_save");
data = file_raw((char *)path_real, &size);
if(data)
{
*out_data = data;
return size;
}
else
{
log_printf(L_WARNING, "Could not open save file\n");
return 0;
}
}
void accept_friend_request(Tox *tox, const uint8_t *public_key, const uint8_t *message, size_t length, void *userdata)
{
unsigned char tox_printable_id[TOX_ADDRESS_SIZE * 2 + 1];
int32_t friendnumber;
TOX_ERR_FRIEND_ADD friend_add_error;
log_printf(L_DEBUG, "Got friend request\n");
if(use_shared_secret)
{
if(!message)
{
log_printf(L_WARNING, "Friend sent NULL message - not accepting request");
return;
}
if(message[length - 1] != '\0')
{
log_printf(L_WARNING, "Message of size %u is not NULL terminated - not accepting request", length);
return;
}
if(strncmp(message, shared_secret, TOX_MAX_FRIEND_REQUEST_LENGTH-1))
{
log_printf(L_WARNING, "Received shared secret \"%s\" differs from our shared secret - not accepting request", message);
return;
}
}
friendnumber = tox_friend_add_norequest(tox, public_key, &friend_add_error);
if(friend_add_error != TOX_ERR_FRIEND_ADD_OK)
{
log_printf(L_WARNING, "Could not add friend: err %u", friend_add_error);
return;
}
memset(tox_printable_id, '\0', sizeof(tox_printable_id));
id_to_string(tox_printable_id, public_key);
log_printf(L_INFO, "Accepted friend request from %s as %d\n", tox_printable_id, friendnumber);
}
/* Callback for tox_callback_self_connection_status() */
void handle_connection_status_change(Tox *tox, TOX_CONNECTION p_connection_status, void *user_data)
{
const char *status = NULL;
connection_status = p_connection_status;
status = readable_connection_status(connection_status);
log_printf(L_INFO, "Connection status changed: %s", status);
}
void cleanup(int status, void *tmp)
{
log_printf(L_DEBUG, "kthxbye\n");
fflush(stdout);
tox_kill(tox);
if(client_socket)
{
close(client_socket);
}
log_close();
}
int do_server_loop()
{
struct timeval tv;
fd_set fds;
unsigned char tox_packet_buf[PROTOCOL_MAX_PACKET_SIZE];
tunnel *tun = NULL;
tunnel *tmp = NULL;
TOX_CONNECTION connected = 0;
tox_callback_friend_lossless_packet(tox, parse_lossless_packet, NULL);
tv.tv_sec = 0;
tv.tv_usec = 20000;
FD_ZERO(&master_server_fds);
while(1)
{
TOX_CONNECTION tmp_isconnected = 0;
uint32_t tox_do_interval_ms;
/* Let tox do its stuff */
tox_iterate(tox);
/* Get the desired sleep time, used in select() later */
tox_do_interval_ms = tox_iteration_interval(tox);
tv.tv_usec = (tox_do_interval_ms % 1000) * 1000;
tv.tv_sec = tox_do_interval_ms / 1000;
/* Check change in connection state */
tmp_isconnected = connection_status;
if(tmp_isconnected != connected)
{
connected = tmp_isconnected;
if(connected)
{
log_printf(L_DEBUG, "Connected to Tox network\n");
}
else
{
log_printf(L_DEBUG, "Disconnected from Tox network\n");
}
}
fds = master_server_fds;
/* Poll for data from our client connection */
select(select_nfds, &fds, NULL, NULL, &tv);
HASH_ITER(hh, by_id, tun, tmp)
{
if(FD_ISSET(tun->sockfd, &fds))
{
int nbytes = recv(tun->sockfd,
tox_packet_buf+PROTOCOL_BUFFER_OFFSET,
READ_BUFFER_SIZE, 0);
/* Check if connection closed */
if(nbytes == 0)
{
char data[PROTOCOL_BUFFER_OFFSET];
protocol_frame frame_st, *frame;
log_printf(L_WARNING, "conn closed!\n");
frame = &frame_st;
memset(frame, 0, sizeof(protocol_frame));
frame->friendnumber = tun->friendnumber;
frame->packet_type = PACKET_TYPE_TCP_FIN;
frame->connid = tun->connid;
frame->data_length = 0;
send_frame(frame, data);
tunnel_delete(tun);
continue;
}
else
{
protocol_frame frame_st, *frame;
frame = &frame_st;
memset(frame, 0, sizeof(protocol_frame));
frame->friendnumber = tun->friendnumber;
frame->packet_type = PACKET_TYPE_TCP;
frame->connid = tun->connid;
frame->data_length = nbytes;
send_frame(frame, tox_packet_buf);
}
}
}
}
}
/* Signal handler used when daemonizing */
static void child_handler(int signum)
{
switch(signum) {
case SIGALRM: exit(1); break;
case SIGUSR1: exit(0); break;
case SIGCHLD: exit(1); break;
}
}
/*
* Daemonize the process if -D is set
* Optionally drop privileges and create a lock file
*/
void do_daemonize()
{
pid_t pid, sid, parent;
FILE *pidf = NULL;
/* already a daemon */
if (getppid() == 1)
{
return;
}
/* Drop user if there is one, and we were run as root */
if (daemon_username && (getuid() == 0 || geteuid() == 0))
{
struct passwd *pw = getpwnam(daemon_username);
if(pw)
{
log_printf(L_DEBUG, "Setuid to user %s", daemon_username);
setuid(pw->pw_uid);
}
else
{
char *tmp;
int uid = 0;
uid = strtol(daemon_username, &tmp, 10);
if(uid)
{
setuid(uid);
log_printf(L_DEBUG, "Setuid to user ID %ld", (long)uid);
}
else
{
log_printf(L_DEBUG, "Could not setuid to user %s - no pwnam (static build?) or invalid numeric UID", daemon_username);
}
}
}
/* Trap signals that we expect to recieve */
signal(SIGCHLD,child_handler);
signal(SIGUSR1,child_handler);
signal(SIGALRM,child_handler);
/* Fork off the parent process */
pid = fork();
if (pid < 0)
{
log_printf(L_ERROR, "Unable to fork daemon, code=%d (%s)",
errno, strerror(errno));
exit(1);
}
/* If we got a good PID, then we can exit the parent process. */
if (pid > 0)
{
/* Wait for confirmation from the child via SIGTERM or SIGCHLD, or
for two seconds to elapse (SIGALRM). pause() should not return. */
alarm(2);
pause();
exit(1);
}
/* At this point we are executing as the child process */
parent = getppid();
/* Cancel certain signals */
signal(SIGCHLD,SIG_DFL); /* A child process dies */
signal(SIGTSTP,SIG_IGN); /* Various TTY signals */
signal(SIGTTOU,SIG_IGN);
signal(SIGTTIN,SIG_IGN);
signal(SIGHUP, SIG_IGN); /* Ignore hangup signal */
signal(SIGTERM,SIG_DFL); /* Die on SIGTERM */
/* Change the file mode mask */
umask(S_IWGRP | S_IWOTH);
/* Reinitialize the syslog connection */
log_init();
/* Create a new SID for the child process */
sid = setsid();
if (sid < 0)
{
log_printf(L_ERROR, "unable to create a new session, code %d (%s)",
errno, strerror(errno));
exit(1);
}
/* Change the current working directory. This prevents the current
directory from being locked; hence not being able to remove it. */
if ((chdir("/")) < 0)
{
log_printf(L_ERROR, "Unable to change directory to %s, code %d (%s)",
"/", errno, strerror(errno) );
exit(1);
}
/* Redirect standard files to /dev/null */
freopen( "/dev/null", "r", stdin);
freopen( "/dev/null", "w", stdout);
freopen( "/dev/null", "w", stderr);
/* Create the pid file as the new user */
if (pidfile && pidfile[0])
{
pidf = fopen(pidfile, "w");
if (!pidf)
{
log_printf(L_ERROR, "Unable to create PID file %s, code=%d (%s)",
pidfile, errno, strerror(errno));
exit(1);
}
fprintf(pidf, "%ld", (long)getpid());
fclose(pidf);
}
/* Tell the parent process that we are A-okay */
kill( parent, SIGUSR1 );
}
void help()
{
fprintf(stderr, "tuntox - Forward ports over the Tox protocol\n");
fprintf(stderr, "USAGE:\n\n");
fprintf(stderr, "-i <toxid> - remote point Tox ID\n");
fprintf(stderr, "-L <localport>:<remotehostname>:<remoteport> - forward <remotehostname>:<remoteport> to 127.0.0.1:<localport>\n");
fprintf(stderr, "-P <remotehostname>:<remoteport> - forward <remotehostname>:<remoteport> to stdin/stdout (SSH ProxyCommand mode)\n");
fprintf(stderr, "-p - ping the server from -i and exit\n");
fprintf(stderr, "-C <dir> - save private key in <dir> instead of /etc/tuntox in server mode\n");
fprintf(stderr, "-s <secret> - shared secret used for connection authentication (max %u characters)\n", TOX_MAX_FRIEND_REQUEST_LENGTH-1);
fprintf(stderr, "-d - debug mode\n");
fprintf(stderr, "-q - quiet mode\n");
fprintf(stderr, "-S - send output to syslog instead of stderr\n");
fprintf(stderr, "-D - daemonize (fork) and exit (implies -S)\n");
fprintf(stderr, "-F <path> - create a PID file named <path>\n");
fprintf(stderr, "-U <username|userid> - drop privileges to <username> before forking. Use numeric <userid> in static builds.\n");
fprintf(stderr, "-h - this help message\n");
}