summary refs log tree commit diff stats
path: root/src/common/identd.c
blob: e6fe8cb393f630d0156cc0129178a86db0bda06b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
/* simple identd server for HexChat under Win32 */

#include "inet.h"
#include "hexchat.h"
#include "hexchatc.h"
#include "text.h"

static int identd_is_running = FALSE;
#ifdef USE_IPV6
static int identd_ipv6_is_running = FALSE;
#endif

static int
identd (char *username)
{
	int sok, read_sok, len;
	char *p;
	char buf[256];
	char outbuf[256];
	struct sockaddr_in addr;

	sok = socket (AF_INET, SOCK_STREAM, 0);
	if (sok == INVALID_SOCKET)
	{
		free (username);
		return 0;
	}

	len = 1;
	setsockopt (sok, SOL_SOCKET, SO_REUSEADDR, (char *) &len, sizeof (len));

	memset (&addr, 0, sizeof (addr));
	addr.sin_family = AF_INET;
	addr.sin_port = htons (113);

	if (bind (sok, (struct sockaddr *) &addr, sizeof (addr)) == SOCKET_ERROR)
	{
		closesocket (sok);
		free (username);
		return 0;
	}

	if (listen (sok, 1) == SOCKET_ERROR)
	{
		closesocket (sok);
		free (username);
		return 0;
	}

	len = sizeof (addr);
	read_sok = accept (sok, (struct sockaddr *) &addr, &len);
	closesocket (sok);
	if (read_sok == INVALID_SOCKET)
	{
		free (username);
		return 0;
	}

	identd_is_running = FALSE;

	snprintf (outbuf, sizeof (outbuf), "%%\tServicing ident request from %s as %s\n",
				 inet_ntoa (addr.sin_addr), username);
	PrintText (current_sess, outbuf);

	recv (read_sok, buf, sizeof (buf) - 1, 0);
	buf[sizeof (buf) - 1] = 0;	  /* ensure null termination */

	p = strchr (buf, ',');
	if (p)
	{
		snprintf (outbuf, sizeof (outbuf) - 1, "%d, %d : USERID : UNIX : %s\r\n",
					 atoi (buf), atoi (p + 1), username);
		outbuf[sizeof (outbuf) - 1] = 0;	/* ensure null termination */
		send (read_sok, outbuf, strlen (outbuf), 0);
	}

	sleep (1);
	closesocket (read_sok);
	free (username);

	return 0;
}

#ifdef USE_IPV6
#define IPV6BUFLEN 60
static int
identd_ipv6 (char *username)
{
	int sok, read_sok, len;
	char *p;
	char buf[256];
	char outbuf[256];	
	LPSTR ipv6buf = (LPSTR) malloc (IPV6BUFLEN);
	struct sockaddr_in6 addr;

	sok = socket (AF_INET6, SOCK_STREAM, 0);

	if (sok == INVALID_SOCKET)
	{
		free (username);
		free (ipv6buf);
		return 0;
	}

	len = 1;
	setsockopt (sok, SOL_SOCKET, SO_REUSEADDR, (char *) &len, sizeof (len));

	memset (&addr, 0, sizeof (addr));
	addr.sin6_family = AF_INET6;
	addr.sin6_port = htons (113);

	if (bind (sok, (struct sockaddr *) &addr, sizeof (addr)) == SOCKET_ERROR)
	{
		closesocket (sok);
		free (username);
		free (ipv6buf);
		return 0;
	}

	if (listen (sok, 1) == SOCKET_ERROR)
	{
		closesocket (sok);
		free (username);
		free (ipv6buf);
		return 0;
	}

	len = sizeof (addr);
	read_sok = accept (sok, (struct sockaddr *) &addr, &len);
	closesocket (sok);

	if (read_sok == INVALID_SOCKET)
	{
		free (username);
		free (ipv6buf);
		return 0;
	}

	identd_ipv6_is_running = FALSE;

	if (WSAAddressToString ((struct sockaddr *) &addr, sizeof (addr), NULL, ipv6buf, (LPDWORD) IPV6BUFLEN) == SOCKET_ERROR)
	{
		snprintf (ipv6buf, sizeof (ipv6buf) - 1, "[SOCKET ERROR: 0x%X]", WSAGetLastError ());
	}

	snprintf (outbuf, sizeof (outbuf), "%%\tServicing ident request from %s as %s\n", ipv6buf, username);
	PrintText (current_sess, outbuf);

	recv (read_sok, buf, sizeof (buf) - 1, 0);
	buf[sizeof (buf) - 1] = 0;	  /* ensure null termination */

	p = strchr (buf, ',');

	if (p)
	{
		snprintf (outbuf, sizeof (outbuf) - 1, "%d, %d : USERID : UNIX : %s\r\n", atoi (buf), atoi (p + 1), username);
		outbuf[sizeof (outbuf) - 1] = 0;	/* ensure null termination */
		send (read_sok, outbuf, strlen (outbuf), 0);
	}

	sleep (1);
	closesocket (read_sok);
	free (username);
	free (ipv6buf);

	return 0;
}
#endif

void
identd_start (char *username)
{
	DWORD tid;

#ifdef USE_IPV6
	DWORD tidv6;
	if (identd_ipv6_is_running == FALSE)
	{
		identd_ipv6_is_running = TRUE;
		CloseHandle (CreateThread (NULL, 0, (LPTHREAD_START_ROUTINE) identd_ipv6,
						 strdup (username), 0, &tidv6));
	}
#endif

	if (identd_is_running == FALSE)
	{
		identd_is_running = TRUE;
		CloseHandle (CreateThread (NULL, 0, (LPTHREAD_START_ROUTINE) identd,
						 strdup (username), 0, &tid));
	}
}