* code and the higher level backend.
*/
-#include <windows.h>
-
#include <assert.h>
+#include <ctype.h>
+#include <string.h>
#define DEFINE_PLUG_METHOD_MACROS
#include "putty.h"
#include "network.h"
#include "proxy.h"
+#define do_proxy_dns \
+ (cfg.proxy_dns == 2 || \
+ (cfg.proxy_dns == 1 && cfg.proxy_type != PROXY_SOCKS))
+
/*
* Call this when proxy negotiation is complete, so that this
* socket can begin working normally.
{
void *data;
int len;
-
+ long output_before, output_after;
+
p->state = PROXY_STATE_ACTIVE;
- /* let's try to keep extra receive events from coming through */
+ /* we want to ignore new receive events until we have sent
+ * all of our buffered receive data.
+ */
sk_set_frozen(p->sub_socket, 1);
+ /* how many bytes of output have we buffered? */
+ output_before = bufchain_size(&p->pending_oob_output_data) +
+ bufchain_size(&p->pending_output_data);
+ /* and keep track of how many bytes do not get sent. */
+ output_after = 0;
+
/* send buffered OOB writes */
while (bufchain_size(&p->pending_oob_output_data) > 0) {
bufchain_prefix(&p->pending_oob_output_data, &data, &len);
- sk_write_oob(p->sub_socket, data, len);
+ output_after += sk_write_oob(p->sub_socket, data, len);
bufchain_consume(&p->pending_oob_output_data, len);
}
- bufchain_clear(&p->pending_oob_output_data);
/* send buffered normal writes */
while (bufchain_size(&p->pending_output_data) > 0) {
bufchain_prefix(&p->pending_output_data, &data, &len);
- sk_write(p->sub_socket, data, len);
+ output_after += sk_write(p->sub_socket, data, len);
bufchain_consume(&p->pending_output_data, len);
}
- bufchain_clear(&p->pending_output_data);
+
+ /* if we managed to send any data, let the higher levels know. */
+ if (output_after < output_before)
+ plug_sent(p->plug, output_after);
/* if we were asked to flush the output during
* the proxy negotiation process, do so now.
*/
if (p->pending_flush) sk_flush(p->sub_socket);
- /* forward buffered recv data to the backend */
- while (bufchain_size(&p->pending_input_data) > 0) {
- bufchain_prefix(&p->pending_input_data, &data, &len);
- plug_receive(p->plug, 0, data, len);
- bufchain_consume(&p->pending_input_data, len);
- }
- bufchain_clear(&p->pending_input_data);
-
- /* now set the underlying socket to whatever freeze state they wanted */
- sk_set_frozen(p->sub_socket, p->freeze);
+ /* if the backend wanted the socket unfrozen, try to unfreeze.
+ * our set_frozen handler will flush buffered receive data before
+ * unfreezing the actual underlying socket.
+ */
+ if (!p->freeze)
+ sk_set_frozen((Socket)p, 0);
}
/* basic proxy socket functions */
ps->freeze = is_frozen;
return;
}
+
+ /* handle any remaining buffered recv data first */
+ if (bufchain_size(&ps->pending_input_data) > 0) {
+ ps->freeze = is_frozen;
+
+ /* loop while we still have buffered data, and while we are
+ * unfrozen. the plug_receive call in the loop could result
+ * in a call back into this function refreezing the socket,
+ * so we have to check each time.
+ */
+ while (!ps->freeze && bufchain_size(&ps->pending_input_data) > 0) {
+ void *data;
+ int len;
+ bufchain_prefix(&ps->pending_input_data, &data, &len);
+ plug_receive(ps->plug, 0, data, len);
+ bufchain_consume(&ps->pending_input_data, len);
+ }
+
+ /* if we're still frozen, we'll have to wait for another
+ * call from the backend to finish unbuffering the data.
+ */
+ if (ps->freeze) return;
+ }
+
sk_set_frozen(ps->sub_socket, is_frozen);
}
return plug_accepting(ps->plug, sock);
}
+/*
+ * This function can accept a NULL pointer as `addr', in which case
+ * it will only check the host name.
+ */
static int proxy_for_destination (SockAddr addr, char * hostname, int port)
{
int s = 0, e = 0;
int hostip_len, hostname_len;
char * exclude_list;
+ /*
+ * Check the host name and IP against the hard-coded
+ * representations of `localhost'.
+ */
+ if (!cfg.even_proxy_localhost &&
+ (sk_hostname_is_local(hostname) ||
+ (addr && sk_address_is_local(addr))))
+ return 0; /* do not proxy */
+
/* we want a string representation of the IP address for comparisons */
- sk_getaddr(addr, hostip, 64);
+ if (addr) {
+ sk_getaddr(addr, hostip, 64);
+ hostip_len = strlen(hostip);
+ }
- hostip_len = strlen(hostip);
hostname_len = strlen(hostname);
exclude_list = cfg.proxy_exclude_list;
if (exclude_list[s] == '*') {
/* wildcard at beginning of entry */
- if (strnicmp(hostip + hostip_len - (e - s - 1),
- exclude_list + s + 1, e - s - 1) == 0 ||
+ if ((addr && strnicmp(hostip + hostip_len - (e - s - 1),
+ exclude_list + s + 1, e - s - 1) == 0) ||
strnicmp(hostname + hostname_len - (e - s - 1),
exclude_list + s + 1, e - s - 1) == 0)
return 0; /* IP/hostname range excluded. do not use proxy. */
} else if (exclude_list[e-1] == '*') {
/* wildcard at end of entry */
- if (strnicmp(hostip, exclude_list + s, e - s - 1) == 0 ||
+ if ((addr && strnicmp(hostip, exclude_list + s, e - s - 1) == 0) ||
strnicmp(hostname, exclude_list + s, e - s - 1) == 0)
return 0; /* IP/hostname range excluded. do not use proxy. */
* match (ie. a specific IP)
*/
- if (stricmp(hostip, exclude_list + s) == 0)
+ if (addr && stricmp(hostip, exclude_list + s) == 0)
return 0; /* IP/hostname excluded. do not use proxy. */
if (stricmp(hostname, exclude_list + s) == 0)
return 0; /* IP/hostname excluded. do not use proxy. */
return 1;
}
+SockAddr name_lookup(char *host, int port, char **canonicalname)
+{
+ if (cfg.proxy_type != PROXY_NONE &&
+ do_proxy_dns && proxy_for_destination(NULL, host, port)) {
+ *canonicalname = dupstr(host);
+ return sk_nonamelookup(host);
+ }
+
+ return sk_namelookup(host, canonicalname);
+}
+
Socket new_connection(SockAddr addr, char *hostname,
int port, int privport,
int oobinline, int nodelay, Plug plug)
{
- static struct socket_function_table socket_fn_table = {
+ static const struct socket_function_table socket_fn_table = {
sk_proxy_plug,
sk_proxy_close,
sk_proxy_write,
sk_proxy_socket_error
};
- static struct plug_function_table plug_fn_table = {
+ static const struct plug_function_table plug_fn_table = {
plug_proxy_closing,
plug_proxy_receive,
plug_proxy_sent,
Proxy_Socket ret;
Proxy_Plug pplug;
SockAddr proxy_addr;
- char * proxy_canonical_name;
+ char *proxy_canonical_name, *err;
ret = smalloc(sizeof(struct Socket_proxy_tag));
ret->fn = &socket_fn_table;
ret->remote_addr = addr;
ret->remote_port = port;
- /* XXX review these initialisations, and initialise other fields
- * in Proxy_Socket structure */
ret->error = NULL;
ret->pending_flush = 0;
ret->freeze = 0;
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_SOCKS) {
/* look-up proxy */
proxy_addr = sk_namelookup(cfg.proxy_host,
&proxy_canonical_name);
+ if ((err = sk_addr_error(proxy_addr))) {
+ 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,
return sk_new(addr, port, privport, oobinline, nodelay, plug);
}
-Socket new_listener(int port, Plug plug, int local_host_only)
+Socket new_listener(char *srcaddr, int port, Plug plug, int local_host_only)
{
/* TODO: SOCKS (and potentially others) support inbound
* TODO: connections via the proxy. support them.
*/
- return sk_newlistener(port, plug, local_host_only);
+ return sk_newlistener(srcaddr, port, plug, local_host_only);
}
/* ----------------------------------------------------------------------
* for this proxy method, it's just a simple HTTP
* request
*/
- char buf[256], dest[64];
+ char *buf, dest[512];
- sk_getaddr(p->remote_addr, dest, 64);
+ sk_getaddr(p->remote_addr, dest, lenof(dest));
- sprintf(buf, "CONNECT %s:%i HTTP/1.1\r\nHost: %s:%i\r\n",
- dest, p->remote_port, dest, p->remote_port);
+ buf = dupprintf("CONNECT %s:%i HTTP/1.1\r\nHost: %s:%i\r\n",
+ dest, p->remote_port, dest, p->remote_port);
sk_write(p->sub_socket, buf, strlen(buf));
+ sfree(buf);
if (cfg.proxy_username[0] || cfg.proxy_password[0]) {
char buf[sizeof(cfg.proxy_username)+sizeof(cfg.proxy_password)];
sk_write(p->sub_socket, buf2, strlen(buf2));
}
- sprintf(buf, "\r\n");
- sk_write(p->sub_socket, buf, strlen(buf));
+ sk_write(p->sub_socket, "\r\n", 2);
p->state = 1;
return 0;
bufchain_consume(&p->pending_input_data, eol);
if (data[status] != '2') {
/* error */
- char buf[1024];
+ char *buf;
data[eol] = '\0';
while (eol > status &&
(data[eol-1] == '\r' || data[eol-1] == '\n'))
data[--eol] = '\0';
- sprintf(buf, "Proxy error: %.900s",
- data+status);
+ buf = dupprintf("Proxy error: %s", data+status);
plug_closing(p->plug, buf, PROXY_ERROR_GENERAL, 0);
+ sfree(buf);
sfree(data);
return 1;
}
{
bufchain_consume(&p->pending_input_data, eol);
datap += eol;
+ len -= eol;
eol = get_line_end(datap, len);
}
* user ID (variable length, null terminated string)
*/
- int length;
- char * command;
+ int length, type, namelen;
+ char *command, addr[4], hostname[512];
- if (sk_addrtype(p->remote_addr) != AF_INET) {
+ type = sk_addrtype(p->remote_addr);
+ if (type == ADDRTYPE_IPV6) {
plug_closing(p->plug, "Proxy error: SOCKS version 4 does"
" not support IPv6", PROXY_ERROR_GENERAL, 0);
return 1;
+ } else if (type == ADDRTYPE_IPV4) {
+ namelen = 0;
+ sk_addrcopy(p->remote_addr, addr);
+ } else { /* type == ADDRTYPE_NAME */
+ sk_getaddr(p->remote_addr, hostname, lenof(hostname));
+ namelen = strlen(hostname) + 1; /* include the NUL */
+ addr[0] = addr[1] = addr[2] = 0;
+ addr[3] = 1;
}
- length = strlen(cfg.proxy_username) + 9;
- command = (char*) malloc(length);
+ length = strlen(cfg.proxy_username) + namelen + 9;
+ command = (char*) smalloc(length);
strcpy(command + 8, cfg.proxy_username);
command[0] = 4; /* version 4 */
command[3] = (char) p->remote_port & 0xff;
/* address */
- sk_addrcopy(p->remote_addr, command + 4);
+ memcpy(command + 4, addr, 4);
+
+ /* hostname */
+ memcpy(command + 8 + strlen(cfg.proxy_username) + 1,
+ hostname, namelen);
sk_write(p->sub_socket, command, length);
- free(command);
+ sfree(command);
p->state = 1;
return 0;
* dest. port (2 bytes) [network order]
*/
- char command[22];
+ char command[512];
int len;
+ int type;
- if (sk_addrtype(p->remote_addr) == AF_INET) {
- len = 10;
+ type = sk_addrtype(p->remote_addr);
+ if (type == ADDRTYPE_IPV4) {
+ len = 10; /* 4 hdr + 4 addr + 2 trailer */
command[3] = 1; /* IPv4 */
- } else {
- len = 22;
+ sk_addrcopy(p->remote_addr, command+4);
+ } else if (type == ADDRTYPE_IPV6) {
+ len = 22; /* 4 hdr + 16 addr + 2 trailer */
command[3] = 4; /* IPv6 */
+ sk_addrcopy(p->remote_addr, command+4);
+ } else if (type == ADDRTYPE_NAME) {
+ command[3] = 3;
+ sk_getaddr(p->remote_addr, command+5, 256);
+ command[4] = strlen(command+5);
+ len = 7 + command[4]; /* 4 hdr, 1 len, N addr, 2 trailer */
}
command[0] = 5; /* version 5 */
command[1] = 1; /* CONNECT command */
command[2] = 0x00;
- /* address */
- sk_addrcopy(p->remote_addr, command+4);
-
/* port */
command[len-2] = (char) (p->remote_port >> 8) & 0xff;
command[len-1] = (char) p->remote_port & 0xff;
int so = 0, eo = 0;
/* we need to escape \\, \%, \r, \n, \t, \x??, \0???,
- * %%, %host, and %port
+ * %%, %host, %port, %user, and %pass
*/
while (cfg.proxy_telnet_command[eo] != 0) {
}
} else {
- /* % escape. we recognize %%, %host, %port. anything else,
- * we just send unescaped (including the %). */
+ /* % escape. we recognize %%, %host, %port, %user, %pass.
+ * anything else, we just send unescaped (including the %).
+ */
if (cfg.proxy_telnet_command[eo] == '%') {
sk_write(p->sub_socket, "%", 1);
eo++;
- }
+ }
else if (strnicmp(cfg.proxy_telnet_command + eo,
"host", 4) == 0) {
- char dest[64];
- sk_getaddr(p->remote_addr, dest, 64);
+ char dest[512];
+ sk_getaddr(p->remote_addr, dest, lenof(dest));
sk_write(p->sub_socket, dest, strlen(dest));
eo += 4;
- }
+ }
else if (strnicmp(cfg.proxy_telnet_command + eo,
"port", 4) == 0) {
char port[8];
sprintf(port, "%i", p->remote_port);
sk_write(p->sub_socket, port, strlen(port));
eo += 4;
- }
+ }
+ else if (strnicmp(cfg.proxy_telnet_command + eo,
+ "user", 4) == 0) {
+ sk_write(p->sub_socket, cfg.proxy_username,
+ strlen(cfg.proxy_username));
+ eo += 4;
+ }
+ else if (strnicmp(cfg.proxy_telnet_command + eo,
+ "pass", 4) == 0) {
+ sk_write(p->sub_socket, cfg.proxy_password,
+ strlen(cfg.proxy_password));
+ eo += 4;
+ }
else {
/* we don't escape this, so send the % now, and
* don't advance eo, so that we'll consider the
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