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);
}
}
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);
}
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);
}
/*
* 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;
}
/*
* 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;
}
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);
}
}
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;
}
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;
}
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);
}
/*
* 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;
}