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[/] [or1k_old/] [trunk/] [uclinux/] [uClinux-2.0.x/] [net/] [ipv4/] [ip_masq_irc.c] - Blame information for rev 1782

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1 199 simons 
/*
2 
 *              IP_MASQ_IRC irc masquerading module
3 
 *
4 
 *
5 
 * Version:     @(#)ip_masq_irc.c 0.01   03/20/96
6 
 *
7 
 * Author:      Juan Jose Ciarlante
8 
 *
9 
 *
10 
 * Fixes:
11 
 *      - set NO_DADDR flag in ip_masq_new().
12 
 *      - Added multiple port support (Nigel Metheringham)
13 
 *
14 
 * FIXME:
15 
 *      - detect also previous "PRIVMSG" string ?.
16 
 *
17 
 *      This program is free software; you can redistribute it and/or
18 
 *      modify it under the terms of the GNU General Public License
19 
 *      as published by the Free Software Foundation; either version
20 
 *      2 of the License, or (at your option) any later version.
21 
 *
22 
 * Multiple Port Support
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 *      The helper can be made to handle up to MAX_MASQ_APP_PORTS (normally 12)
24 
 *      with the port numbers being defined at module load time.  The module
25 
 *      uses the symbol "ports" to define a list of monitored ports, which can
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 *      be specified on the insmod command line as
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 *              ports=x1,x2,x3...
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 *      where x[n] are integer port numbers.  This option can be put into
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 *      /etc/conf.modules (or /etc/modules.conf depending on your config)
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 *      where modload will pick it up should you use modload to load your
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 *      modules.
32 
 *
33 
 */
34 
 
35 
#include <linux/module.h>
36 
 
37 
#include <linux/types.h>
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#include <linux/kernel.h>
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#include <asm/system.h>
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#include <linux/skbuff.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <net/protocol.h>
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#include <net/tcp.h>
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#include <net/ip_masq.h>
46 
 
47 
#ifndef DEBUG_CONFIG_IP_MASQ_IRC
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#define DEBUG_CONFIG_IP_MASQ_IRC 0
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#endif
50 
 
51 
#ifdef MODULE
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#define STATIC
53 
#else
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#define STATIC  static
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#endif
56 
 
57 
/*
58 
 * List of ports (up to MAX_MASQ_APP_PORTS) to be handled by helper
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 * First port is set to the default port.
60 
 */
61 
STATIC int ports[MAX_MASQ_APP_PORTS] = {6667}; /* I rely on the trailing items being set to zero */
62 
struct ip_masq_app *masq_incarnations[MAX_MASQ_APP_PORTS];
63 
 
64 
static int
65 
masq_irc_init_1 (struct ip_masq_app *mapp, struct ip_masq *ms)
66 
{
67 
        MOD_INC_USE_COUNT;
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        return 0;
69 
}
70 
 
71 
static int
72 
masq_irc_done_1 (struct ip_masq_app *mapp, struct ip_masq *ms)
73 
{
74 
        MOD_DEC_USE_COUNT;
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        return 0;
76 
}
77 
 
78 
int
79 
masq_irc_out (struct ip_masq_app *mapp, struct ip_masq *ms, struct sk_buff **skb_p, struct device *dev)
80 
{
81 
        struct sk_buff *skb;
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        struct iphdr *iph;
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        struct tcphdr *th;
84 
        char *data, *data_limit;
85 
        __u32 s_addr;
86 
        __u16 s_port;
87 
        struct ip_masq *n_ms;
88 
        char buf[20];           /* "m_addr m_port" (dec base)*/
89 
        unsigned buf_len;
90 
        int diff;
91 
        int xtra_args = 0;      /* extra int args wanted after addr */
92 
        char *dcc_p, *addr_beg_p, *addr_end_p;
93 
 
94 
        skb = *skb_p;
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        iph = skb->h.iph;
96 
        th = (struct tcphdr *)&(((char *)iph)[iph->ihl*4]);
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        data = (char *)&th[1];
98 
 
99 
        /*
100 
         *      Hunt irc DCC string, the _shortest_:
101 
         *
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         *      strlen("DCC CHAT chat AAAAAAAA P\x01\n")=26
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         *      strlen("DCC SEND F AAAAAAAA P S\x01\n")=25
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         *              AAAAAAAAA: bound addr (1.0.0.0==16777216, min 8 digits)
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         *              P:         bound port (min 1 d )
106 
         *              F:         filename   (min 1 d )
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         *              S:         size       (min 1 d )
108 
         *              0x01, \n:  terminators
109 
         */
110 
 
111 
        data_limit = skb->h.raw + skb->len;
112 
 
113 
        while (data < (data_limit - 25) )
114 
        {
115 
                if (memcmp(data,"DCC ",4))  {
116 
                        data ++;
117 
                        continue;
118 
                }
119 
 
120 
                dcc_p = data;
121 
                data += 4;     /* point to DCC cmd */
122 
 
123 
                if (memcmp(data, "CHAT ", 5) == 0 ||
124 
                    memcmp(data, "SEND ", 5) == 0)
125 
                {
126 
                        /*
127 
                         *      extra arg (file_size) req. for "SEND"
128 
                         */
129 
 
130 
                        if (*data == 'S') xtra_args++;
131 
                        data += 5;
132 
                }
133 
                else
134 
                        continue;
135 
 
136 
                /*
137 
                 *      skip next string.
138 
                 */
139 
 
140 
                while( *data++ != ' ')
141 
 
142 
                        /*
143 
                         *      must still parse, at least, "AAAAAAAA P\x01\n",
144 
                         *      12 bytes left.
145 
                         */
146 
                        if (data > (data_limit-12)) return 0;
147 
 
148 
 
149 
                addr_beg_p = data;
150 
 
151 
                /*
152 
                 *      client bound address in dec base
153 
                 */
154 
 
155 
                s_addr = simple_strtoul(data,&data,10);
156 
                if (*data++ !=' ')
157 
                        continue;
158 
 
159 
                /*
160 
                 *      client bound port in dec base
161 
                 */
162 
 
163 
                s_port = simple_strtoul(data,&data,10);
164 
                addr_end_p = data;
165 
 
166 
                /*
167 
                 *      should check args consistency?
168 
                 */
169 
 
170 
                while(xtra_args) {
171 
                        if (*data != ' ')
172 
                                break;
173 
                        data++;
174 
                        simple_strtoul(data,&data,10);
175 
                        xtra_args--;
176 
                }
177 
 
178 
                if (xtra_args != 0) continue;
179 
 
180 
                /*
181 
                 *      terminators.
182 
                 */
183 
 
184 
                if (data[0] != 0x01)
185 
                        continue;
186 
                if (data[1]!='\r' && data[1]!='\n')
187 
                        continue;
188 
 
189 
                /*
190 
                 *      Now create an masquerade entry for it
191 
                 *      must set NO_DPORT and NO_DADDR because
192 
                 *      connection is requested by another client.
193 
                 */
194 
 
195 
                n_ms = ip_masq_new(dev, IPPROTO_TCP,
196 
                                   htonl(s_addr),htons(s_port),
197 
                                   0, 0,
198 
                                   IP_MASQ_F_NO_DPORT|IP_MASQ_F_NO_DADDR
199 
                                   );
200 
                if (n_ms==NULL)
201 
                        return 0;
202 
 
203 
                ip_masq_set_expire(n_ms, ip_masq_expire->tcp_fin_timeout);
204 
 
205 
                /*
206 
                 * Replace the old "address port" with the new one
207 
                 */
208 
 
209 
                buf_len = sprintf(buf,"%lu %u",
210 
                        ntohl(n_ms->maddr),ntohs(n_ms->mport));
211 
 
212 
                /*
213 
                 * Calculate required delta-offset to keep TCP happy
214 
                 */
215 
 
216 
                diff = buf_len - (addr_end_p-addr_beg_p);
217 
 
218 
#if DEBUG_CONFIG_IP_MASQ_IRC
219 
                *addr_beg_p = '\0';
220 
                printk("masq_irc_out(): '%s' %X:%X detected (diff=%d)\n", dcc_p, s_addr,s_port, diff);
221 
#endif
222 
                /*
223 
                 *      No shift.
224 
                 */
225 
 
226 
                if (diff==0)
227 
                {
228 
                        /*
229 
                         * simple case, just copy.
230 
                         */
231 
                        memcpy(addr_beg_p,buf,buf_len);
232 
                        return 0;
233 
                }
234 
 
235 
                *skb_p = ip_masq_skb_replace(skb, GFP_ATOMIC,
236 
                                             addr_beg_p, addr_end_p-addr_beg_p,
237 
                                             buf, buf_len);
238 
                return diff;
239 
        }
240 
        return 0;
241 
 
242 
}
243 
 
244 
/*
245 
 *      Main irc object
246 
 *      You need 1 object per port in case you need
247 
 *      to offer also other used irc ports (6665,6666,etc),
248 
 *      they will share methods but they need own space for
249 
 *      data.
250 
 */
251 
 
252 
struct ip_masq_app ip_masq_irc = {
253 
        NULL,                   /* next */
254 
        "irc",                  /* name */
255 
        0,                      /* type */
256 
        0,                      /* n_attach */
257 
        masq_irc_init_1,        /* init_1 */
258 
        masq_irc_done_1,        /* done_1 */
259 
        masq_irc_out,           /* pkt_out */
260 
        NULL                    /* pkt_in */
261 
};
262 
 
263 
/*
264 
 *      ip_masq_irc initialization
265 
 */
266 
 
267 
int ip_masq_irc_init(void)
268 
{
269 
        int i, j;
270 
 
271 
        for (i=0; (i<MAX_MASQ_APP_PORTS); i++) {
272 
                if (ports[i]) {
273 
                        if ((masq_incarnations[i] = kmalloc(sizeof(struct ip_masq_app),
274 
                                                            GFP_KERNEL)) == NULL)
275 
                                return -ENOMEM;
276 
                        memcpy(masq_incarnations[i], &ip_masq_irc, sizeof(struct ip_masq_app));
277 
                        if ((j = register_ip_masq_app(masq_incarnations[i],
278 
                                                      IPPROTO_TCP,
279 
                                                      ports[i]))) {
280 
                                return j;
281 
                        }
282 
#if DEBUG_CONFIG_IP_MASQ_IRC
283 
                        printk("Irc: loaded support on port[%d] = %d\n",
284 
                               i, ports[i]);
285 
#endif
286 
                } else {
287 
                        /* To be safe, force the incarnation table entry to NULL */
288 
                        masq_incarnations[i] = NULL;
289 
                }
290 
        }
291 
        return 0;
292 
}
293 
 
294 
/*
295 
 *      ip_masq_irc fin.
296 
 */
297 
 
298 
int ip_masq_irc_done(void)
299 
{
300 
        int i, j, k;
301 
 
302 
        k=0;
303 
        for (i=0; (i<MAX_MASQ_APP_PORTS); i++) {
304 
                if (masq_incarnations[i]) {
305 
                        if ((j = unregister_ip_masq_app(masq_incarnations[i]))) {
306 
                                k = j;
307 
                        } else {
308 
                                kfree(masq_incarnations[i]);
309 
                                masq_incarnations[i] = NULL;
310 
#if DEBUG_CONFIG_IP_MASQ_IRC
311 
                                printk("Irc: unloaded support on port[%d] = %d\n",
312 
                                       i, ports[i]);
313 
#endif
314 
                        }
315 
                }
316 
        }
317 
        return k;
318 
}
319 
 
320 
 
321 
#ifdef MODULE
322 
 
323 
int init_module(void)
324 
{
325 
        if (ip_masq_irc_init() != 0)
326 
                return -EIO;
327 
        register_symtab(NULL);
328 
        return 0;
329 
}
330 
 
331 
void cleanup_module(void)
332 
{
333 
        if (ip_masq_irc_done() != 0)
334 
                printk("ip_masq_irc: can't remove module");
335 
}
336 
 
337 
#endif /* MODULE */

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