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1 | /* |
2 | * Dolda Connect - Modular multiuser Direct Connect-style client |
302a2600 |
3 | * Copyright (C) 2004 Fredrik Tolf <fredrik@dolda2000.com> |
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4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * GNU General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
19 | #include <stdlib.h> |
20 | #include <stdio.h> |
21 | #include <unistd.h> |
22 | #include <stdarg.h> |
23 | #include <string.h> |
24 | #include <netinet/in.h> |
25 | #include <arpa/inet.h> |
26 | #include <wctype.h> |
27 | #include <iconv.h> |
28 | #include <errno.h> |
29 | |
30 | #ifdef HAVE_CONFIG_H |
31 | #include <config.h> |
32 | #endif |
33 | #include "filenet.h" |
34 | #include "log.h" |
35 | #include "module.h" |
36 | #include "utils.h" |
37 | #include "client.h" |
38 | #include "transfer.h" |
39 | #include "sysevents.h" |
40 | #include "net.h" |
24a794c2 |
41 | #include <tiger.h> |
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42 | |
43 | /* Protocol states */ |
44 | #define ADC_PROTOCOL 0 |
45 | #define ADC_IDENTIFY 1 |
46 | #define ADC_VERIFY 2 |
47 | #define ADC_NORMAL 3 |
48 | #define ADC_DATA 4 |
49 | |
50 | struct command { |
51 | wchar_t *name; |
52 | int minargs, needsender; |
53 | void (*func)(struct fnetnode *fn, wchar_t *command, wchar_t *sender, int argc, wchar_t **argv); |
54 | }; |
55 | |
56 | struct qcmd { |
57 | struct qcmd *next; |
58 | wchar_t **args; |
59 | }; |
60 | |
61 | struct adchub { |
62 | char *inbuf; |
63 | size_t inbufdata, inbufsize; |
64 | wchar_t *sid; |
65 | wchar_t *cb; |
66 | size_t cbdata, cbsize; |
67 | wchar_t **sup; |
68 | iconv_t ich; |
69 | int state; |
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70 | struct wcspair *hubinf; |
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71 | struct qcmd *queue; |
72 | }; |
73 | |
74 | static wchar_t *eoc; |
75 | /* I've never understood why both of these are necessary, but... */ |
76 | static wchar_t *privid, *cid; |
77 | |
78 | static wchar_t **parseadc(wchar_t *cmdline) |
79 | { |
80 | wchar_t **ret; |
81 | size_t retsize, retdata; |
82 | wchar_t *p, *p2, *ep; |
83 | wchar_t r; |
84 | ssize_t len; |
85 | |
86 | ret = NULL; |
87 | retsize = retdata = 0; |
88 | p = cmdline; |
89 | do { |
90 | if((p2 = wcschr(p, L' ')) != NULL) |
91 | *(p2++) = L'\0'; |
92 | len = wcslen(p); |
93 | for(ep = p; len > 0; ep++, len--) { |
94 | if(*ep == L'\\') { |
95 | if(ep[1] == L's') { |
96 | r = L' '; |
97 | } else if(ep[1] == L'n') { |
98 | r = L'\n'; |
99 | } else if(ep[1] == L'\\') { |
100 | r = L'\\'; |
101 | } else { |
102 | memmove(ep, ep + 2, (len -= 2) * sizeof(*ep)); |
103 | ep--; |
104 | continue; |
105 | } |
106 | memmove(ep, ep + 1, --len * sizeof(*ep)); |
107 | *ep = r; |
108 | } |
109 | } |
110 | *ep = L'\0'; |
111 | addtobuf(ret, swcsdup(p)); |
112 | p = p2; |
113 | } while(p2 != NULL); |
114 | addtobuf(ret, NULL); |
115 | return(ret); |
116 | } |
117 | |
118 | static void sendeoc(struct socket *sk) |
119 | { |
120 | sockqueue(sk, "\n", 1); |
121 | } |
122 | |
123 | static void sendadc1(struct socket *sk, int sep, wchar_t *arg) |
124 | { |
125 | char *mbsbuf; |
126 | wchar_t *buf; |
127 | size_t bufsize, bufdata; |
128 | |
129 | buf = NULL; |
130 | bufsize = bufdata = 0; |
131 | if(sep) |
132 | addtobuf(buf, L' '); |
133 | for(; *arg != L'\0'; arg++) { |
134 | if(*arg == L' ') |
135 | bufcat(buf, L"\\s", 2); |
136 | else if(*arg == L'\n') |
137 | bufcat(buf, L"\\n", 2); |
138 | else if(*arg == L'\\') |
139 | bufcat(buf, L"\\\\", 2); |
140 | else |
141 | addtobuf(buf, *arg); |
142 | } |
143 | addtobuf(buf, L'\0'); |
144 | mbsbuf = icwcstombs(buf, "utf-8"); |
145 | sockqueue(sk, mbsbuf, strlen(mbsbuf)); |
146 | free(mbsbuf); |
147 | } |
148 | |
149 | static void sendadc(struct socket *sk, int sep, ...) |
150 | { |
151 | va_list args; |
152 | wchar_t *arg; |
153 | int i; |
154 | |
155 | va_start(args, sep); |
156 | for(i = 0; (arg = va_arg(args, wchar_t *)) != NULL; i++) { |
157 | if(arg == eoc) |
158 | sendeoc(sk); |
159 | else |
160 | sendadc1(sk, (i == 0)?sep:1, arg); |
161 | } |
162 | va_end(args); |
163 | } |
164 | |
165 | static struct qcmd *newqcmd(struct qcmd **queue, wchar_t **args) |
166 | { |
167 | struct qcmd *new; |
168 | |
169 | while(*queue != NULL) |
170 | queue = &((*queue)->next); |
171 | new = smalloc(sizeof(*new)); |
172 | new->next = NULL; |
173 | new->args = args; |
174 | *queue = new; |
175 | return(new); |
176 | } |
177 | |
178 | static struct qcmd *ulqcmd(struct qcmd **queue) |
179 | { |
180 | struct qcmd *ret; |
181 | |
182 | if((ret = *queue) == NULL) |
183 | return(NULL); |
184 | *queue = ret->next; |
185 | return(ret); |
186 | } |
187 | |
188 | static void freeqcmd(struct qcmd *qcmd) |
189 | { |
190 | freeparr(qcmd->args); |
191 | free(qcmd); |
192 | } |
193 | |
194 | #define ADC_CMDFN(name) static void name(struct fnetnode *fn, wchar_t *command, wchar_t *sender, int argc, wchar_t **argv) |
0d6c5363 |
195 | #ifdef __GNUC__ |
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196 | #define UNUSED __attribute__ ((unused)) |
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197 | #else |
9db779f4 |
198 | #define UNUSED |
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199 | #endif |
9db779f4 |
200 | #define ADC_CMDCOM \ |
201 | struct socket *sk UNUSED = fn->sk; \ |
202 | struct adchub *hub UNUSED = fn->data; |
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203 | |
204 | ADC_CMDFN(cmd_sup) |
205 | { |
206 | ADC_CMDCOM; |
207 | int i, o, f; |
208 | |
209 | for(i = 1; i < argc; i++) { |
210 | if(wcslen(argv[i]) < 3) |
211 | continue; |
212 | for(o = 0, f = 0; hub->sup[o]; o++) { |
213 | if(!wcscmp(argv[i] + 2, hub->sup[o])) { |
214 | f = 1; |
215 | break; |
216 | } |
217 | } |
218 | if(!wcsncmp(argv[i], L"AD", 2)) { |
219 | if(f) |
220 | continue; |
221 | hub->sup = srealloc(hub->sup, sizeof(*(hub->sup)) * (o + 1)); |
222 | hub->sup[o] = swcsdup(argv[i] + 2); |
223 | } else if(!wcsncmp(argv[i], L"RM", 2)) { |
224 | if(!f) |
225 | continue; |
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226 | free(hub->sup[o]); |
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227 | memmove(hub->sup[o], hub->sup[o + 1], parrlen(hub->sup) - o); |
228 | } |
229 | } |
230 | } |
231 | |
232 | ADC_CMDFN(cmd_sid) |
233 | { |
234 | ADC_CMDCOM; |
235 | |
236 | if(hub->sid != NULL) |
237 | free(hub->sid); |
238 | hub->sid = swcsdup(argv[1]); |
239 | if(hub->state == ADC_PROTOCOL) { |
240 | hub->state = ADC_IDENTIFY; |
241 | } |
242 | } |
243 | |
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244 | ADC_CMDFN(cmd_inf) |
245 | { |
246 | ADC_CMDCOM; |
247 | |
248 | if(sender == NULL) { |
249 | |
250 | } |
251 | } |
252 | |
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253 | static struct command hubcmds[] = { |
254 | {L"SUP", 1, 0, cmd_sup}, |
255 | {L"SID", 2, 0, cmd_sid}, |
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256 | {L"INF", 0, 0, cmd_inf}, |
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257 | {NULL, 0, 0, NULL} |
258 | }; |
259 | |
260 | static void dispatch(struct qcmd *qcmd, struct fnetnode *fn) |
261 | { |
262 | struct command *cmd; |
263 | int argc; |
264 | wchar_t *cmdnm, *sender, **argv; |
265 | |
266 | if((argc = parrlen(argv = qcmd->args)) < 1) |
267 | return; |
268 | cmdnm = *(argv++); |
269 | argc--; |
270 | if(wcslen(cmdnm) < 2) |
271 | return; |
272 | sender = NULL; |
273 | if((*cmdnm == L'B') || (*cmdnm == L'F')) { |
274 | if(argc < 1) |
275 | return; |
276 | sender = *(argv++); |
277 | argc--; |
278 | } else if((*cmdnm == L'D') || (*cmdnm == L'E')) { |
279 | if(argc < 2) |
280 | return; |
281 | sender = *argv; |
282 | argv += 2; |
283 | argc -= 2; |
284 | } |
285 | for(cmd = hubcmds; cmd->func != NULL; cmd++) { |
286 | if(!wcscmp(cmd->name, qcmd->args[0] + 1)) { |
287 | if(argc < cmd->minargs) |
288 | return; |
289 | cmd->func(fn, cmdnm, sender, argc, qcmd->args); |
290 | return; |
291 | } |
292 | } |
293 | flog(LOG_DEBUG, "unknown adc command: %ls", qcmd->args[0]); |
294 | } |
295 | |
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296 | static void hubread(struct socket *sk, struct fnetnode *fn) |
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297 | { |
298 | int ret; |
299 | struct adchub *hub; |
300 | char *newbuf, *p1, *p2; |
301 | wchar_t *p; |
302 | size_t datalen, cblen; |
303 | |
304 | hub = fn->data; |
305 | if((newbuf = sockgetinbuf(sk, &datalen)) == NULL) |
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306 | return; |
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307 | if(hub->inbufdata > 1024) |
308 | hub->inbufdata = 0; |
309 | bufcat(hub->inbuf, newbuf, datalen); |
310 | free(newbuf); |
311 | /* Memory eating protection */ |
312 | if(hub->cbdata > 65536) |
313 | hub->cbdata = 0; |
314 | while(hub->inbufdata > 0) { |
315 | if(hub->cbdata == hub->cbsize) |
316 | sizebuf2(hub->cb, hub->cbdata + datalen, 1); |
317 | p1 = hub->inbuf; |
318 | p2 = (char *)(hub->cb + hub->cbdata); |
319 | cblen = sizeof(*(hub->cb)) * (hub->cbsize - hub->cbdata); |
320 | ret = iconv(hub->ich, &p1, &hub->inbufdata, &p2, &cblen); |
321 | memmove(hub->inbuf, p1, hub->inbufdata); |
322 | if(((p2 - ((char *)hub->cb)) % sizeof(*hub->cb)) != 0) { |
323 | flog(LOG_CRIT, "Spotted a dismembered wchar_t!"); |
324 | abort(); |
325 | } |
326 | hub->cbdata = hub->cbsize - (cblen / sizeof(*(hub->cb))); |
327 | if(ret < 0) { |
328 | if(errno == EILSEQ) { |
329 | flog(LOG_DEBUG, "adc fnetnode %i sent illegal utf-8 sequence", fn->id); |
330 | killfnetnode(fn); |
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331 | return; |
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332 | } else if(errno == EINVAL) { |
333 | break; |
334 | } else if(errno == E2BIG) { |
335 | /* continue; */ |
336 | } else { |
337 | flog(LOG_WARNING, "bug? iconv returned unexpected error: %s", strerror(errno)); |
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338 | return; |
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339 | } |
340 | } |
341 | } |
342 | while((p = wmemchr(hub->cb, L'\n', hub->cbdata)) != NULL) { |
343 | *(p++) = L'\0'; |
344 | newqcmd(&hub->queue, parseadc(hub->cb)); |
345 | memmove(hub->cb, p, (hub->cbdata -= (p - hub->cb)) * sizeof(*(hub->cb))); |
346 | } |
347 | } |
348 | |
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349 | static void huberr(struct socket *sk, int err, struct fnetnode *fn) |
58e83d6a |
350 | { |
351 | killfnetnode(fn); |
352 | } |
353 | |
354 | static void hubconnect(struct fnetnode *fn) |
355 | { |
356 | struct adchub *hub; |
357 | |
cab0b442 |
358 | fn->sk->readcb = (void (*)(struct socket *, void *))hubread; |
359 | fn->sk->errcb = (void (*)(struct socket *, int, void *))huberr; |
360 | fn->sk->data = fn; |
361 | getfnetnode(fn); |
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362 | |
363 | hub = smalloc(sizeof(*hub)); |
364 | memset(hub, 0, sizeof(*hub)); |
365 | if((hub->ich = iconv_open("wchar_t", "utf-8")) == (iconv_t)-1) { |
366 | flog(LOG_CRIT, "iconv cannot handle UTF-8: %s", strerror(errno)); |
367 | killfnetnode(fn); |
368 | return; |
369 | } |
370 | fn->data = hub; |
371 | sendadc(fn->sk, 0, L"HSUP", L"ADBASE", eoc, NULL); |
372 | } |
373 | |
374 | static void hubdestroy(struct fnetnode *fn) |
375 | { |
376 | struct adchub *hub; |
377 | |
378 | if((hub = fn->data) == NULL) |
379 | return; |
380 | iconv_close(hub->ich); |
381 | if(hub->inbuf != NULL) |
382 | free(hub->inbuf); |
383 | if(hub->sup != NULL) |
384 | freeparr(hub->sup); |
385 | free(hub); |
386 | } |
387 | |
388 | static int hubsetnick(struct fnetnode *fn, wchar_t *newnick) |
389 | { |
390 | return(0); |
391 | } |
392 | |
393 | static int hubreqconn(struct fnetpeer *peer) |
394 | { |
395 | return(0); |
396 | } |
397 | |
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398 | static struct fnet adcnet_store = { |
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399 | .connect = hubconnect, |
400 | .destroy = hubdestroy, |
401 | .setnick = hubsetnick, |
402 | .reqconn = hubreqconn, |
403 | .name = L"adc" |
404 | }; |
405 | |
3ad44ea7 |
406 | static struct fnet *adcnet = &adcnet_store; |
407 | |
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408 | static int run(void) |
409 | { |
410 | int ret; |
411 | struct fnetnode *fn, *nextfn; |
412 | struct adchub *hub; |
413 | struct qcmd *qcmd; |
414 | |
415 | ret = 0; |
416 | for(fn = fnetnodes; fn != NULL; fn = nextfn) { |
417 | nextfn = fn->next; |
3ad44ea7 |
418 | if(fn->fnet != adcnet) |
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419 | continue; |
420 | if((hub = fn->data) == NULL) |
421 | continue; |
422 | if((qcmd = ulqcmd(&hub->queue)) != NULL) { |
423 | if((fn->sk != NULL) && (fn->sk->state == SOCK_EST)) |
424 | dispatch(qcmd, fn); |
425 | freeqcmd(qcmd); |
426 | ret = 1; |
427 | break; |
428 | } |
429 | } |
430 | return(ret); |
431 | } |
432 | |
433 | static void preinit(int hup) |
434 | { |
435 | if(hup) |
436 | return; |
3ad44ea7 |
437 | regfnet(adcnet); |
58e83d6a |
438 | } |
439 | |
440 | static int init(int hup) |
441 | { |
442 | int i; |
443 | char idbuf[24], *id32; |
444 | struct tigerhash th; |
445 | |
446 | if(!hup) { |
447 | eoc = swcsdup(L""); |
448 | |
449 | if((privid = fetchvar("adc.pid", NULL)) == NULL) { |
450 | for(i = 0; i < sizeof(idbuf); i++) |
451 | idbuf[i] = rand() % 256; |
452 | id32 = base32encode(idbuf, sizeof(idbuf)); |
453 | id32[39] = 0; |
454 | privid = icmbstowcs(id32, "us-ascii"); |
455 | free(id32); |
456 | storevar("adc.pid", privid, sizeof(*privid) * (wcslen(privid) + 1)); |
457 | } |
458 | |
459 | id32 = base32decode(icswcstombs(privid, "us-ascii", NULL), NULL); |
460 | inittiger(&th); |
461 | dotiger(&th, id32, 24); |
462 | synctiger(&th); |
463 | free(id32); |
464 | restiger(&th, idbuf); |
465 | id32 = base32encode(idbuf, sizeof(idbuf)); |
466 | id32[39] = 0; |
467 | cid = icmbstowcs(id32, "us-ascii"); |
468 | free(id32); |
469 | } |
470 | return(0); |
471 | } |
472 | |
473 | static void terminate(void) |
474 | { |
475 | |
476 | } |
477 | |
478 | static struct configvar myvars[] = { |
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479 | /** Specifies a specific UDP port to use for ADC search |
480 | * results. If left unspecified, a port is allocated |
481 | * dynamically. Useful for NAT routers (see also the |
482 | * net.visibleipv4 address for those cases). */ |
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483 | {CONF_VAR_INT, "udpport", {.num = 0}}, |
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484 | /** Specifies a specific TCP port to use for ADC peer |
485 | * connections. If left unspecified, a port is allocated |
486 | * dynamically. Useful for NAT routers (see also the |
487 | * net.visibleipv4 address for those cases). */ |
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488 | {CONF_VAR_INT, "tcpport", {.num = 0}}, |
489 | {CONF_VAR_END} |
490 | }; |
491 | |
492 | static struct module me = { |
493 | .conf = { |
494 | .vars = myvars |
495 | }, |
496 | .preinit = preinit, |
497 | .init = init, |
498 | .run = run, |
499 | .terminate = terminate, |
500 | .name = "adc" |
501 | }; |
502 | |
503 | MODULE(me) |