58e83d6a |
1 | /* |
2 | * Dolda Connect - Modular multiuser Direct Connect-style client |
3 | * Copyright (C) 2004 Fredrik Tolf (fredrik@dolda2000.com) |
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> |
58e83d6a |
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; |
24a794c2 |
70 | struct wcspair *hubinf; |
58e83d6a |
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) |
195 | #define ADC_CMDCOM struct socket *sk = fn->sk; struct adchub *hub = fn->data; |
196 | |
197 | ADC_CMDFN(cmd_sup) |
198 | { |
199 | ADC_CMDCOM; |
200 | int i, o, f; |
201 | |
202 | for(i = 1; i < argc; i++) { |
203 | if(wcslen(argv[i]) < 3) |
204 | continue; |
205 | for(o = 0, f = 0; hub->sup[o]; o++) { |
206 | if(!wcscmp(argv[i] + 2, hub->sup[o])) { |
207 | f = 1; |
208 | break; |
209 | } |
210 | } |
211 | if(!wcsncmp(argv[i], L"AD", 2)) { |
212 | if(f) |
213 | continue; |
214 | hub->sup = srealloc(hub->sup, sizeof(*(hub->sup)) * (o + 1)); |
215 | hub->sup[o] = swcsdup(argv[i] + 2); |
216 | } else if(!wcsncmp(argv[i], L"RM", 2)) { |
217 | if(!f) |
218 | continue; |
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219 | free(hub->sup[o]); |
58e83d6a |
220 | memmove(hub->sup[o], hub->sup[o + 1], parrlen(hub->sup) - o); |
221 | } |
222 | } |
223 | } |
224 | |
225 | ADC_CMDFN(cmd_sid) |
226 | { |
227 | ADC_CMDCOM; |
228 | |
229 | if(hub->sid != NULL) |
230 | free(hub->sid); |
231 | hub->sid = swcsdup(argv[1]); |
232 | if(hub->state == ADC_PROTOCOL) { |
233 | hub->state = ADC_IDENTIFY; |
234 | } |
235 | } |
236 | |
24a794c2 |
237 | ADC_CMDFN(cmd_inf) |
238 | { |
239 | ADC_CMDCOM; |
240 | |
241 | if(sender == NULL) { |
242 | |
243 | } |
244 | } |
245 | |
58e83d6a |
246 | static struct command hubcmds[] = { |
247 | {L"SUP", 1, 0, cmd_sup}, |
248 | {L"SID", 2, 0, cmd_sid}, |
24a794c2 |
249 | {L"INF", 0, 0, cmd_inf}, |
58e83d6a |
250 | {NULL, 0, 0, NULL} |
251 | }; |
252 | |
253 | static void dispatch(struct qcmd *qcmd, struct fnetnode *fn) |
254 | { |
255 | struct command *cmd; |
256 | int argc; |
257 | wchar_t *cmdnm, *sender, **argv; |
258 | |
259 | if((argc = parrlen(argv = qcmd->args)) < 1) |
260 | return; |
261 | cmdnm = *(argv++); |
262 | argc--; |
263 | if(wcslen(cmdnm) < 2) |
264 | return; |
265 | sender = NULL; |
266 | if((*cmdnm == L'B') || (*cmdnm == L'F')) { |
267 | if(argc < 1) |
268 | return; |
269 | sender = *(argv++); |
270 | argc--; |
271 | } else if((*cmdnm == L'D') || (*cmdnm == L'E')) { |
272 | if(argc < 2) |
273 | return; |
274 | sender = *argv; |
275 | argv += 2; |
276 | argc -= 2; |
277 | } |
278 | for(cmd = hubcmds; cmd->func != NULL; cmd++) { |
279 | if(!wcscmp(cmd->name, qcmd->args[0] + 1)) { |
280 | if(argc < cmd->minargs) |
281 | return; |
282 | cmd->func(fn, cmdnm, sender, argc, qcmd->args); |
283 | return; |
284 | } |
285 | } |
286 | flog(LOG_DEBUG, "unknown adc command: %ls", qcmd->args[0]); |
287 | } |
288 | |
cab0b442 |
289 | static void hubread(struct socket *sk, struct fnetnode *fn) |
58e83d6a |
290 | { |
291 | int ret; |
292 | struct adchub *hub; |
293 | char *newbuf, *p1, *p2; |
294 | wchar_t *p; |
295 | size_t datalen, cblen; |
296 | |
297 | hub = fn->data; |
298 | if((newbuf = sockgetinbuf(sk, &datalen)) == NULL) |
cab0b442 |
299 | return; |
58e83d6a |
300 | if(hub->inbufdata > 1024) |
301 | hub->inbufdata = 0; |
302 | bufcat(hub->inbuf, newbuf, datalen); |
303 | free(newbuf); |
304 | /* Memory eating protection */ |
305 | if(hub->cbdata > 65536) |
306 | hub->cbdata = 0; |
307 | while(hub->inbufdata > 0) { |
308 | if(hub->cbdata == hub->cbsize) |
309 | sizebuf2(hub->cb, hub->cbdata + datalen, 1); |
310 | p1 = hub->inbuf; |
311 | p2 = (char *)(hub->cb + hub->cbdata); |
312 | cblen = sizeof(*(hub->cb)) * (hub->cbsize - hub->cbdata); |
313 | ret = iconv(hub->ich, &p1, &hub->inbufdata, &p2, &cblen); |
314 | memmove(hub->inbuf, p1, hub->inbufdata); |
315 | if(((p2 - ((char *)hub->cb)) % sizeof(*hub->cb)) != 0) { |
316 | flog(LOG_CRIT, "Spotted a dismembered wchar_t!"); |
317 | abort(); |
318 | } |
319 | hub->cbdata = hub->cbsize - (cblen / sizeof(*(hub->cb))); |
320 | if(ret < 0) { |
321 | if(errno == EILSEQ) { |
322 | flog(LOG_DEBUG, "adc fnetnode %i sent illegal utf-8 sequence", fn->id); |
323 | killfnetnode(fn); |
cab0b442 |
324 | return; |
58e83d6a |
325 | } else if(errno == EINVAL) { |
326 | break; |
327 | } else if(errno == E2BIG) { |
328 | /* continue; */ |
329 | } else { |
330 | flog(LOG_WARNING, "bug? iconv returned unexpected error: %s", strerror(errno)); |
cab0b442 |
331 | return; |
58e83d6a |
332 | } |
333 | } |
334 | } |
335 | while((p = wmemchr(hub->cb, L'\n', hub->cbdata)) != NULL) { |
336 | *(p++) = L'\0'; |
337 | newqcmd(&hub->queue, parseadc(hub->cb)); |
338 | memmove(hub->cb, p, (hub->cbdata -= (p - hub->cb)) * sizeof(*(hub->cb))); |
339 | } |
340 | } |
341 | |
cab0b442 |
342 | static void huberr(struct socket *sk, int err, struct fnetnode *fn) |
58e83d6a |
343 | { |
344 | killfnetnode(fn); |
345 | } |
346 | |
347 | static void hubconnect(struct fnetnode *fn) |
348 | { |
349 | struct adchub *hub; |
350 | |
cab0b442 |
351 | fn->sk->readcb = (void (*)(struct socket *, void *))hubread; |
352 | fn->sk->errcb = (void (*)(struct socket *, int, void *))huberr; |
353 | fn->sk->data = fn; |
354 | getfnetnode(fn); |
58e83d6a |
355 | |
356 | hub = smalloc(sizeof(*hub)); |
357 | memset(hub, 0, sizeof(*hub)); |
358 | if((hub->ich = iconv_open("wchar_t", "utf-8")) == (iconv_t)-1) { |
359 | flog(LOG_CRIT, "iconv cannot handle UTF-8: %s", strerror(errno)); |
360 | killfnetnode(fn); |
361 | return; |
362 | } |
363 | fn->data = hub; |
364 | sendadc(fn->sk, 0, L"HSUP", L"ADBASE", eoc, NULL); |
365 | } |
366 | |
367 | static void hubdestroy(struct fnetnode *fn) |
368 | { |
369 | struct adchub *hub; |
370 | |
371 | if((hub = fn->data) == NULL) |
372 | return; |
373 | iconv_close(hub->ich); |
374 | if(hub->inbuf != NULL) |
375 | free(hub->inbuf); |
376 | if(hub->sup != NULL) |
377 | freeparr(hub->sup); |
378 | free(hub); |
379 | } |
380 | |
381 | static int hubsetnick(struct fnetnode *fn, wchar_t *newnick) |
382 | { |
383 | return(0); |
384 | } |
385 | |
386 | static int hubreqconn(struct fnetpeer *peer) |
387 | { |
388 | return(0); |
389 | } |
390 | |
3ad44ea7 |
391 | static struct fnet adcnet_store = { |
58e83d6a |
392 | .connect = hubconnect, |
393 | .destroy = hubdestroy, |
394 | .setnick = hubsetnick, |
395 | .reqconn = hubreqconn, |
396 | .name = L"adc" |
397 | }; |
398 | |
3ad44ea7 |
399 | static struct fnet *adcnet = &adcnet_store; |
400 | |
58e83d6a |
401 | static int run(void) |
402 | { |
403 | int ret; |
404 | struct fnetnode *fn, *nextfn; |
405 | struct adchub *hub; |
406 | struct qcmd *qcmd; |
407 | |
408 | ret = 0; |
409 | for(fn = fnetnodes; fn != NULL; fn = nextfn) { |
410 | nextfn = fn->next; |
3ad44ea7 |
411 | if(fn->fnet != adcnet) |
58e83d6a |
412 | continue; |
413 | if((hub = fn->data) == NULL) |
414 | continue; |
415 | if((qcmd = ulqcmd(&hub->queue)) != NULL) { |
416 | if((fn->sk != NULL) && (fn->sk->state == SOCK_EST)) |
417 | dispatch(qcmd, fn); |
418 | freeqcmd(qcmd); |
419 | ret = 1; |
420 | break; |
421 | } |
422 | } |
423 | return(ret); |
424 | } |
425 | |
426 | static void preinit(int hup) |
427 | { |
428 | if(hup) |
429 | return; |
3ad44ea7 |
430 | regfnet(adcnet); |
58e83d6a |
431 | } |
432 | |
433 | static int init(int hup) |
434 | { |
435 | int i; |
436 | char idbuf[24], *id32; |
437 | struct tigerhash th; |
438 | |
439 | if(!hup) { |
440 | eoc = swcsdup(L""); |
441 | |
442 | if((privid = fetchvar("adc.pid", NULL)) == NULL) { |
443 | for(i = 0; i < sizeof(idbuf); i++) |
444 | idbuf[i] = rand() % 256; |
445 | id32 = base32encode(idbuf, sizeof(idbuf)); |
446 | id32[39] = 0; |
447 | privid = icmbstowcs(id32, "us-ascii"); |
448 | free(id32); |
449 | storevar("adc.pid", privid, sizeof(*privid) * (wcslen(privid) + 1)); |
450 | } |
451 | |
452 | id32 = base32decode(icswcstombs(privid, "us-ascii", NULL), NULL); |
453 | inittiger(&th); |
454 | dotiger(&th, id32, 24); |
455 | synctiger(&th); |
456 | free(id32); |
457 | restiger(&th, idbuf); |
458 | id32 = base32encode(idbuf, sizeof(idbuf)); |
459 | id32[39] = 0; |
460 | cid = icmbstowcs(id32, "us-ascii"); |
461 | free(id32); |
462 | } |
463 | return(0); |
464 | } |
465 | |
466 | static void terminate(void) |
467 | { |
468 | |
469 | } |
470 | |
471 | static struct configvar myvars[] = { |
d9f89ef5 |
472 | /** Specifies a specific UDP port to use for ADC search |
473 | * results. If left unspecified, a port is allocated |
474 | * dynamically. Useful for NAT routers (see also the |
475 | * net.visibleipv4 address for those cases). */ |
58e83d6a |
476 | {CONF_VAR_INT, "udpport", {.num = 0}}, |
d9f89ef5 |
477 | /** Specifies a specific TCP port to use for ADC peer |
478 | * connections. If left unspecified, a port is allocated |
479 | * dynamically. Useful for NAT routers (see also the |
480 | * net.visibleipv4 address for those cases). */ |
58e83d6a |
481 | {CONF_VAR_INT, "tcpport", {.num = 0}}, |
482 | {CONF_VAR_END} |
483 | }; |
484 | |
485 | static struct module me = { |
486 | .conf = { |
487 | .vars = myvars |
488 | }, |
489 | .preinit = preinit, |
490 | .init = init, |
491 | .run = run, |
492 | .terminate = terminate, |
493 | .name = "adc" |
494 | }; |
495 | |
496 | MODULE(me) |