Пример #1
0
SockAddr name_lookup(const char *host,
                     int port,
                     char **canonicalname,
                     Conf *conf,
                     int addressfamily,
                     void *frontend,
                     const char *reason)
{
  char *logmsg;
  if (conf_get_int(conf, CONF_proxy_type) != PROXY_NONE && do_proxy_dns(conf) &&
      proxy_for_destination(NULL, host, port, conf)) {

    if (frontend) {
      logmsg = dupprintf("Leaving host lookup to proxy of \"%s\""
                         " (for %s)",
                         host,
                         reason);
      logevent(frontend, logmsg);
      sfree(logmsg);
    }

    *canonicalname = dupstr(host);
    return sk_nonamelookup(host);
  } else {
    if (frontend) {
      logmsg = dns_log_msg(host, addressfamily, reason);
      logevent(frontend, logmsg);
      sfree(logmsg);
    }

    return sk_namelookup(host, canonicalname, addressfamily);
  }
}
Пример #2
0
SockAddr name_lookup(char *host, int port, char **canonicalname,
		const Config *cfg, int addressfamily) {
	if (cfg->proxy_type != PROXY_NONE && do_proxy_dns(cfg)
			&& proxy_for_destination(NULL, host, port, cfg)) {
		*canonicalname = dupstr(host);
		return sk_nonamelookup(host);
	}

	return sk_namelookup(host, canonicalname, addressfamily);
}
Пример #3
0
SockAddr name_lookup(char *host, int port, char **canonicalname,
		     Conf *conf, int addressfamily)
{
    if (conf_get_int(conf, CONF_proxy_type) != PROXY_NONE &&
	do_proxy_dns(conf) &&
	proxy_for_destination(NULL, host, port, conf)) {
	*canonicalname = dupstr(host);
	return sk_nonamelookup(host);
    }

    return sk_namelookup(host, canonicalname, addressfamily);
}
Пример #4
0
Файл: raw.c Проект: rdebath/sgt
/*
 * Called to set up the raw connection.
 * 
 * Returns an error message, or NULL on success.
 *
 * Also places the canonical host name into `realhost'. It must be
 * freed by the caller.
 */
static char *raw_init(char *host, int port, char **realhost, int nodelay)
{
    static struct plug_function_table fn_table = {
	raw_closing,
	raw_receive,
	raw_sent
    }, *fn_table_ptr = &fn_table;

    SockAddr addr;
    char *err;

    /*
     * Try to find host.
     */
    {
	char buf[200];
	sprintf(buf, "Looking up host \"%.170s\"", host);
	logevent(buf);
    }
    addr = sk_namelookup(host, realhost);
    if ((err = sk_addr_error(addr)))
	return err;

    if (port < 0)
	port = 23;		       /* default telnet port */

    /*
     * Open socket.
     */
    {
	char buf[200], addrbuf[100];
	sk_getaddr(addr, addrbuf, 100);
	sprintf(buf, "Connecting to %.100s port %d", addrbuf, port);
	logevent(buf);
    }
    s = new_connection(addr, *realhost, port, 0, 1, nodelay, &fn_table_ptr);
    if ((err = sk_socket_error(s)))
	return err;

    sk_addr_free(addr);

    return NULL;
}
Пример #5
0
/*
 * Called when receiving a PORT OPEN from the server
 */
char *pfd_newconnect(Socket *s, char *hostname, int port, void *c)
{
    static struct plug_function_table fn_table = {
	pfd_closing,
	pfd_receive,
	pfd_sent,
	NULL
    };

    SockAddr addr;
    char *err, *dummy_realhost;
    struct PFwdPrivate *pr;

    /*
     * Try to find host.
     */
    addr = sk_namelookup(hostname, &dummy_realhost);
    if ((err = sk_addr_error(addr)))
	return err;

    /*
     * Open socket.
     */
    pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate));
    pr->fn = &fn_table;
    pr->throttled = pr->throttle_override = 0;
    pr->ready = 1;
    pr->c = c;

    pr->s = *s = sk_new(addr, port, 0, 1, 0, (Plug) pr);
    if ((err = sk_socket_error(*s))) {
	sfree(pr);
	return err;
    }

    sk_set_private_ptr(*s, pr);
    sk_addr_free(addr);
    return NULL;
}
Пример #6
0
SockAddr *name_lookup(const char *host, int port, char **canonicalname,
                     Conf *conf, int addressfamily, LogContext *logctx,
                     const char *reason)
{
    if (conf_get_int(conf, CONF_proxy_type) != PROXY_NONE &&
	do_proxy_dns(conf) &&
	proxy_for_destination(NULL, host, port, conf)) {

        if (logctx)
            logeventf(logctx, "Leaving host lookup to proxy of \"%s\""
                      " (for %s)", host, reason);

	*canonicalname = dupstr(host);
	return sk_nonamelookup(host);
    } else {
        if (logctx)
            logevent_and_free(
                logctx, dns_log_msg(host, addressfamily, reason));

        return sk_namelookup(host, canonicalname, addressfamily);
    }
}
Пример #7
0
Socket new_connection(SockAddr addr,
                      const char *hostname,
                      int port,
                      int privport,
                      int oobinline,
                      int nodelay,
                      int keepalive,
                      Plug plug,
                      Conf *conf)
{
  static const struct socket_function_table socket_fn_table = {
      sk_proxy_plug,
      sk_proxy_close,
      sk_proxy_write,
      sk_proxy_write_oob,
      sk_proxy_write_eof,
      sk_proxy_flush,
      sk_proxy_set_frozen,
      sk_proxy_socket_error,
      NULL, /* peer_info */
  };

  static const struct plug_function_table plug_fn_table = {
      plug_proxy_log,
      plug_proxy_closing,
      plug_proxy_receive,
      plug_proxy_sent,
      plug_proxy_accepting};

  if (conf_get_int(conf, CONF_proxy_type) != PROXY_NONE &&
      proxy_for_destination(addr, hostname, port, conf)) {
    Proxy_Socket ret;
    Proxy_Plug pplug;
    SockAddr proxy_addr;
    char *proxy_canonical_name;
    const char *proxy_type;
    Socket sret;
    int type;

    if ((sret = platform_new_connection(addr,
                                        hostname,
                                        port,
                                        privport,
                                        oobinline,
                                        nodelay,
                                        keepalive,
                                        plug,
                                        conf)) != NULL)
      return sret;

    ret = snew(struct Socket_proxy_tag);
    ret->fn = &socket_fn_table;
    ret->conf = conf_copy(conf);
    ret->plug = plug;
    ret->remote_addr = addr; /* will need to be freed on close */
    ret->remote_port = port;

    ret->error = NULL;
    ret->pending_flush = 0;
    ret->pending_eof = 0;
    ret->freeze = 0;

    bufchain_init(&ret->pending_input_data);
    bufchain_init(&ret->pending_output_data);
    bufchain_init(&ret->pending_oob_output_data);

    ret->sub_socket = NULL;
    ret->state = PROXY_STATE_NEW;
    ret->negotiate = NULL;

    type = conf_get_int(conf, CONF_proxy_type);
    if (type == PROXY_HTTP) {
      ret->negotiate = proxy_http_negotiate;
      proxy_type = "HTTP";
    } else if (type == PROXY_SOCKS4) {
      ret->negotiate = proxy_socks4_negotiate;
      proxy_type = "SOCKS 4";
    } else if (type == PROXY_SOCKS5) {
      ret->negotiate = proxy_socks5_negotiate;
      proxy_type = "SOCKS 5";
    } else if (type == PROXY_TELNET) {
      ret->negotiate = proxy_telnet_negotiate;
      proxy_type = "Telnet";
    } else {
      ret->error = "Proxy error: Unknown proxy method";
      return (Socket)ret;
    }

    {
      char *logmsg = dupprintf("Will use %s proxy at %s:%d to connect"
                               " to %s:%d",
                               proxy_type,
                               conf_get_str(conf, CONF_proxy_host),
                               conf_get_int(conf, CONF_proxy_port),
                               hostname,
                               port);
      plug_log(plug, 2, NULL, 0, logmsg, 0);
      sfree(logmsg);
    }

    /* create the proxy plug to map calls from the actual
     * socket into our proxy socket layer */
    pplug = snew(struct Plug_proxy_tag);
    pplug->fn = &plug_fn_table;
    pplug->proxy_socket = ret;

    {
      char *logmsg = dns_log_msg(conf_get_str(conf, CONF_proxy_host),
                                 conf_get_int(conf, CONF_addressfamily),
                                 "proxy");
      plug_log(plug, 2, NULL, 0, logmsg, 0);
      sfree(logmsg);
    }

    /* look-up proxy */
    proxy_addr = sk_namelookup(conf_get_str(conf, CONF_proxy_host),
                               &proxy_canonical_name,
                               conf_get_int(conf, CONF_addressfamily));
    if (sk_addr_error(proxy_addr) != NULL) {
      ret->error = "Proxy error: Unable to resolve proxy host name";
      sfree(pplug);
      sk_addr_free(proxy_addr);
      return (Socket)ret;
    }
    sfree(proxy_canonical_name);

    {
      char addrbuf[256], *logmsg;
      sk_getaddr(proxy_addr, addrbuf, lenof(addrbuf));
      logmsg = dupprintf("Connecting to %s proxy at %s port %d",
                         proxy_type,
                         addrbuf,
                         conf_get_int(conf, CONF_proxy_port));
      plug_log(plug, 2, NULL, 0, logmsg, 0);
      sfree(logmsg);
    }

    /* create the actual socket we will be using,
     * connected to our proxy server and port.
     */
    ret->sub_socket = sk_new(proxy_addr,
                             conf_get_int(conf, CONF_proxy_port),
                             privport,
                             oobinline,
                             nodelay,
                             keepalive,
                             (Plug)pplug);
    if (sk_socket_error(ret->sub_socket) != NULL)
      return (Socket)ret;

    /* start the proxy negotiation process... */
    sk_set_frozen(ret->sub_socket, 0);
    ret->negotiate(ret, PROXY_CHANGE_NEW);

    return (Socket)ret;
  }
Пример #8
0
Socket new_connection(SockAddr addr, char *hostname,
		      int port, int privport,
		      int oobinline, int nodelay, int keepalive,
		      Plug plug, const Config *cfg)
{
    static const struct socket_function_table socket_fn_table = {
	sk_proxy_plug,
	sk_proxy_close,
	sk_proxy_write,
	sk_proxy_write_oob,
	sk_proxy_flush,
	sk_proxy_set_private_ptr,
	sk_proxy_get_private_ptr,
	sk_proxy_set_frozen,
	sk_proxy_socket_error
    };

    static const struct plug_function_table plug_fn_table = {
	plug_proxy_log,
	plug_proxy_closing,
	plug_proxy_receive,
	plug_proxy_sent,
	plug_proxy_accepting
    };

    if (cfg->proxy_type != PROXY_NONE &&
	proxy_for_destination(addr, hostname, port, cfg))
    {
	Proxy_Socket ret;
	Proxy_Plug pplug;
	SockAddr proxy_addr;
	char *proxy_canonical_name;
	Socket sret;

	if ((sret = platform_new_connection(addr, hostname, port, privport,
					    oobinline, nodelay, keepalive,
					    plug, cfg)) !=
	    NULL)
	    return sret;

	ret = snew(struct Socket_proxy_tag);
	ret->fn = &socket_fn_table;
	ret->cfg = *cfg;	       /* STRUCTURE COPY */
	ret->plug = plug;
	ret->remote_addr = addr;       /* will need to be freed on close */
	ret->remote_port = port;

	ret->error = NULL;
	ret->pending_flush = 0;
	ret->freeze = 0;

	bufchain_init(&ret->pending_input_data);
	bufchain_init(&ret->pending_output_data);
	bufchain_init(&ret->pending_oob_output_data);

	ret->sub_socket = NULL;
	ret->state = PROXY_STATE_NEW;
	ret->negotiate = NULL;
	
	if (cfg->proxy_type == PROXY_HTTP) {
	    ret->negotiate = proxy_http_negotiate;
	} else if (cfg->proxy_type == PROXY_SOCKS4) {
            ret->negotiate = proxy_socks4_negotiate;
	} else if (cfg->proxy_type == PROXY_SOCKS5) {
            ret->negotiate = proxy_socks5_negotiate;
	} else if (cfg->proxy_type == PROXY_TELNET) {
	    ret->negotiate = proxy_telnet_negotiate;
	} else {
	    ret->error = "Proxy error: Unknown proxy method";
	    return (Socket) ret;
	}

	/* create the proxy plug to map calls from the actual
	 * socket into our proxy socket layer */
	pplug = snew(struct Plug_proxy_tag);
	pplug->fn = &plug_fn_table;
	pplug->proxy_socket = ret;

	/* look-up proxy */
	proxy_addr = sk_namelookup(cfg->proxy_host,
				   &proxy_canonical_name, cfg->addressfamily);
	if (sk_addr_error(proxy_addr) != NULL) {
	    ret->error = "Proxy error: Unable to resolve proxy host name";
	    return (Socket)ret;
	}
	sfree(proxy_canonical_name);

	/* create the actual socket we will be using,
	 * connected to our proxy server and port.
	 */
	ret->sub_socket = sk_new(proxy_addr, cfg->proxy_port,
				 privport, oobinline,
				 nodelay, keepalive, (Plug) pplug);
	if (sk_socket_error(ret->sub_socket) != NULL)
	    return (Socket) ret;

	/* start the proxy negotiation process... */
	sk_set_frozen(ret->sub_socket, 0);
	ret->negotiate(ret, PROXY_CHANGE_NEW);

	return (Socket) ret;
    }
Пример #9
0
Socket *new_connection(SockAddr *addr, const char *hostname,
                       int port, bool privport,
                       bool oobinline, bool nodelay, bool keepalive,
                       Plug *plug, Conf *conf)
{
    if (conf_get_int(conf, CONF_proxy_type) != PROXY_NONE &&
	proxy_for_destination(addr, hostname, port, conf))
    {
	ProxySocket *ret;
	SockAddr *proxy_addr;
	char *proxy_canonical_name;
        const char *proxy_type;
	Socket *sret;
	int type;

	if ((sret = platform_new_connection(addr, hostname, port, privport,
					    oobinline, nodelay, keepalive,
					    plug, conf)) !=
	    NULL)
	    return sret;

	ret = snew(ProxySocket);
	ret->sock.vt = &ProxySocket_sockvt;
	ret->plugimpl.vt = &ProxySocket_plugvt;
	ret->conf = conf_copy(conf);
	ret->plug = plug;
	ret->remote_addr = addr;       /* will need to be freed on close */
	ret->remote_port = port;

	ret->error = NULL;
	ret->pending_flush = false;
	ret->pending_eof = false;
	ret->freeze = false;

	bufchain_init(&ret->pending_input_data);
	bufchain_init(&ret->pending_output_data);
	bufchain_init(&ret->pending_oob_output_data);

	ret->sub_socket = NULL;
	ret->state = PROXY_STATE_NEW;
	ret->negotiate = NULL;

	type = conf_get_int(conf, CONF_proxy_type);
	if (type == PROXY_HTTP) {
	    ret->negotiate = proxy_http_negotiate;
            proxy_type = "HTTP";
	} else if (type == PROXY_SOCKS4) {
            ret->negotiate = proxy_socks4_negotiate;
            proxy_type = "SOCKS 4";
	} else if (type == PROXY_SOCKS5) {
            ret->negotiate = proxy_socks5_negotiate;
            proxy_type = "SOCKS 5";
	} else if (type == PROXY_TELNET) {
	    ret->negotiate = proxy_telnet_negotiate;
            proxy_type = "Telnet";
	} else {
	    ret->error = "Proxy error: Unknown proxy method";
	    return &ret->sock;
	}

        {
            char *logmsg = dupprintf("Will use %s proxy at %s:%d to connect"
                                      " to %s:%d", proxy_type,
                                      conf_get_str(conf, CONF_proxy_host),
                                      conf_get_int(conf, CONF_proxy_port),
                                      hostname, port);
            plug_log(plug, 2, NULL, 0, logmsg, 0);
            sfree(logmsg);
        }

        {
            char *logmsg = dns_log_msg(conf_get_str(conf, CONF_proxy_host),
                                       conf_get_int(conf, CONF_addressfamily),
                                       "proxy");
            plug_log(plug, 2, NULL, 0, logmsg, 0);
            sfree(logmsg);
        }

	/* look-up proxy */
	proxy_addr = sk_namelookup(conf_get_str(conf, CONF_proxy_host),
				   &proxy_canonical_name,
				   conf_get_int(conf, CONF_addressfamily));
	if (sk_addr_error(proxy_addr) != NULL) {
	    ret->error = "Proxy error: Unable to resolve proxy host name";
            sk_addr_free(proxy_addr);
	    return &ret->sock;
	}
	sfree(proxy_canonical_name);

        {
            char addrbuf[256], *logmsg;
            sk_getaddr(proxy_addr, addrbuf, lenof(addrbuf));
            logmsg = dupprintf("Connecting to %s proxy at %s port %d",
                               proxy_type, addrbuf,
                               conf_get_int(conf, CONF_proxy_port));
            plug_log(plug, 2, NULL, 0, logmsg, 0);
            sfree(logmsg);
        }

	/* create the actual socket we will be using,
	 * connected to our proxy server and port.
	 */
	ret->sub_socket = sk_new(proxy_addr,
				 conf_get_int(conf, CONF_proxy_port),
				 privport, oobinline,
				 nodelay, keepalive, &ret->plugimpl);
	if (sk_socket_error(ret->sub_socket) != NULL)
	    return &ret->sock;

	/* start the proxy negotiation process... */
	sk_set_frozen(ret->sub_socket, 0);
	ret->negotiate(ret, PROXY_CHANGE_NEW);

	return &ret->sock;
    }

    /* no proxy, so just return the direct socket */
    return sk_new(addr, port, privport, oobinline, nodelay, keepalive, plug);
}
Пример #10
0
/*
 * Called to set up the rlogin connection.
 * 
 * Returns an error message, or NULL on success.
 *
 * Also places the canonical host name into `realhost'. It must be
 * freed by the caller.
 */
static char *rlogin_init(char *host, int port, char **realhost, int nodelay)
{
    static struct plug_function_table fn_table = {
	rlogin_closing,
	rlogin_receive,
	rlogin_sent
    }, *fn_table_ptr = &fn_table;

    SockAddr addr;
    char *err;

    /*
     * Try to find host.
     */
    {
	char buf[200];
	sprintf(buf, "Looking up host \"%.170s\"", host);
	logevent(buf);
    }
    addr = sk_namelookup(host, realhost);
    if ((err = sk_addr_error(addr)))
	return err;

    if (port < 0)
	port = 513;		       /* default rlogin port */

    /*
     * Open socket.
     */
    {
	char buf[200], addrbuf[100];
	sk_getaddr(addr, addrbuf, 100);
	sprintf(buf, "Connecting to %.100s port %d", addrbuf, port);
	logevent(buf);
    }
    s = sk_new(addr, port, 1, 0, nodelay, &fn_table_ptr);
    if ((err = sk_socket_error(s)))
	return err;

    sk_addr_free(addr);

    /*
     * Send local username, remote username, terminal/speed
     */

    {
	char z = 0;
	char *p;
	sk_write(s, &z, 1);
	sk_write(s, cfg.localusername, strlen(cfg.localusername));
	sk_write(s, &z, 1);
	sk_write(s, cfg.username, strlen(cfg.username));
	sk_write(s, &z, 1);
	sk_write(s, cfg.termtype, strlen(cfg.termtype));
	sk_write(s, "/", 1);
	for (p = cfg.termspeed; isdigit(*p); p++);
	sk_write(s, cfg.termspeed, p - cfg.termspeed);
	rlogin_bufsize = sk_write(s, &z, 1);
    }

    return NULL;
}