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Added support for socks5 protocol

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This commit is contained in:
Eugene Protozanov 2018-04-16 14:51:02 +04:00
parent 3a61c8b0b1
commit a43dd11fc9
1 changed files with 30 additions and 0 deletions
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30
probe.c
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@ -40,6 +40,7 @@ static int is_xmpp_protocol(const char *p, int len, struct proto*);
static int is_http_protocol(const char *p, int len, struct proto*);
static int is_tls_protocol(const char *p, int len, struct proto*);
static int is_adb_protocol(const char *p, int len, struct proto*);
static int is_socks5_protocol(const char *p, int len, struct proto*);
static int is_true(const char *p, int len, struct proto* proto) { return 1; }
/* Table of protocols that have a built-in probe
@ -54,6 +55,7 @@ static struct proto builtins[] = {
{ "ssl", NULL, NULL, 1, 0, 0, is_tls_protocol },
{ "tls", NULL, NULL, 1, 0, 0, is_tls_protocol },
{ "adb", NULL, NULL, 1, 0, 0, is_adb_protocol },
{ "socks5", NULL, NULL, 1, 0, 0, is_socks5_protocol },
{ "anyprot", NULL, NULL, 1, 0, 0, is_true }
};
@ -311,6 +313,34 @@ static int is_adb_protocol(const char *p, int len, struct proto *proto)
return probe_adb_cnxn_message(&p[sizeof(empty_message)]);
}
static int is_socks5_protocol(const char *p, int len, struct proto *proto)
{
if (len < 2)
return PROBE_AGAIN;
/* First byte should be socks protocol version */
if (p[0] != 5)
return PROBE_NEXT;
/* Second byte should be number of supported
* authentication methods, assuming maximum of 10,
* as defined in https://www.iana.org/assignments/socks-methods/socks-methods.xhtml
*/
char m_count = p[1];
if (m_count < 1 || m_count > 10)
return PROBE_NEXT;
if (len < 2 + m_count)
return PROBE_AGAIN;
/* Each authentication method number should be in range 0..9 */
for (unsigned char i = 0; i < m_count; i++) {
if (p[3 + i] < 0 || p[3 + i] > 9)
return PROBE_NEXT;
}
return PROBE_MATCH;
}
static int regex_probe(const char *p, int len, struct proto *proto)
{
#ifdef ENABLE_REGEX