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alias_irc.c (190841) alias_irc.c (259858)
1/*-
2 * Copyright (c) 2001 Charles Mott <cm@linktel.net>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
1/*-
2 * Copyright (c) 2001 Charles Mott <cm@linktel.net>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/netinet/libalias/alias_irc.c 190841 2009-04-08 11:56:49Z piso $");
28__FBSDID("$FreeBSD: head/sys/netinet/libalias/alias_irc.c 259858 2013-12-25 02:06:57Z glebius $");
29
30/* Alias_irc.c intercepts packages contain IRC CTCP commands, and
31 changes DCC commands to export a port on the aliasing host instead
32 of an aliased host.
33
34 For this routine to work, the DCC command must fit entirely into a
35 single TCP packet. This will usually happen, but is not
36 guaranteed.

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87
88/* Local defines */
89#define DBprintf(a)
90
91static void
92AliasHandleIrcOut(struct libalias *, struct ip *, struct alias_link *,
93 int maxpacketsize);
94
29
30/* Alias_irc.c intercepts packages contain IRC CTCP commands, and
31 changes DCC commands to export a port on the aliasing host instead
32 of an aliased host.
33
34 For this routine to work, the DCC command must fit entirely into a
35 single TCP packet. This will usually happen, but is not
36 guaranteed.

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87
88/* Local defines */
89#define DBprintf(a)
90
91static void
92AliasHandleIrcOut(struct libalias *, struct ip *, struct alias_link *,
93 int maxpacketsize);
94
95static int
95static int
96fingerprint(struct libalias *la, struct alias_data *ah)
97{
98
96fingerprint(struct libalias *la, struct alias_data *ah)
97{
98
99 if (ah->dport == NULL || ah->dport == NULL || ah->lnk == NULL ||
99 if (ah->dport == NULL || ah->dport == NULL || ah->lnk == NULL ||
100 ah->maxpktsize == 0)
101 return (-1);
102 if (ntohs(*ah->dport) == IRC_CONTROL_PORT_NUMBER_1
103 || ntohs(*ah->dport) == IRC_CONTROL_PORT_NUMBER_2)
104 return (0);
105 return (-1);
106}
107
100 ah->maxpktsize == 0)
101 return (-1);
102 if (ntohs(*ah->dport) == IRC_CONTROL_PORT_NUMBER_1
103 || ntohs(*ah->dport) == IRC_CONTROL_PORT_NUMBER_2)
104 return (0);
105 return (-1);
106}
107
108static int
108static int
109protohandler(struct libalias *la, struct ip *pip, struct alias_data *ah)
110{
111
112 newpacket = malloc(PKTSIZE);
113 if (newpacket) {
114 AliasHandleIrcOut(la, pip, ah->lnk, ah->maxpktsize);
115 free(newpacket);
116 }
117 return (0);
118}
119
120struct proto_handler handlers[] = {
109protohandler(struct libalias *la, struct ip *pip, struct alias_data *ah)
110{
111
112 newpacket = malloc(PKTSIZE);
113 if (newpacket) {
114 AliasHandleIrcOut(la, pip, ah->lnk, ah->maxpktsize);
115 free(newpacket);
116 }
117 return (0);
118}
119
120struct proto_handler handlers[] = {
121 {
122 .pri = 90,
123 .dir = OUT,
124 .proto = TCP,
125 .fingerprint = &fingerprint,
121 {
122 .pri = 90,
123 .dir = OUT,
124 .proto = TCP,
125 .fingerprint = &fingerprint,
126 .protohandler = &protohandler
126 .protohandler = &protohandler
127 },
127 },
128 { EOH }
129};
130
131static int
132mod_handler(module_t mod, int type, void *data)
133{
134 int error;
135

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144 break;
145 default:
146 error = EINVAL;
147 }
148 return (error);
149}
150
151#ifdef _KERNEL
128 { EOH }
129};
130
131static int
132mod_handler(module_t mod, int type, void *data)
133{
134 int error;
135

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144 break;
145 default:
146 error = EINVAL;
147 }
148 return (error);
149}
150
151#ifdef _KERNEL
152static
152static
153#endif
154moduledata_t alias_mod = {
155 "alias_irc", mod_handler, NULL
156};
157
158/* Kernel module definition. */
159#ifdef _KERNEL
160DECLARE_MODULE(alias_irc, alias_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);

--- 328 unchanged lines hidden --- 		153#endif
154moduledata_t alias_mod = {
155 "alias_irc", mod_handler, NULL
156};
157
158/* Kernel module definition. */
159#ifdef _KERNEL
160DECLARE_MODULE(alias_irc, alias_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);

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