Commit | Line | Data |
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58e83d6a | 1 | /* |
2 | * Dolda Connect - Modular multiuser Direct Connect-style client | |
302a2600 | 3 | * Copyright (C) 2004 Fredrik Tolf <fredrik@dolda2000.com> |
58e83d6a | 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 | ||
ed63a7f8 FT |
61 | struct qcmdqueue { |
62 | struct qcmd *f, *l; | |
63 | int size; | |
64 | }; | |
65 | ||
58e83d6a | 66 | struct adchub { |
ffa81d5f | 67 | struct socket *sk; |
58e83d6a | 68 | char *inbuf; |
69 | size_t inbufdata, inbufsize; | |
70 | wchar_t *sid; | |
71 | wchar_t *cb; | |
72 | size_t cbdata, cbsize; | |
73 | wchar_t **sup; | |
74 | iconv_t ich; | |
75 | int state; | |
24a794c2 | 76 | struct wcspair *hubinf; |
ed63a7f8 | 77 | struct qcmdqueue queue; |
58e83d6a | 78 | }; |
79 | ||
80 | static wchar_t *eoc; | |
81 | /* I've never understood why both of these are necessary, but... */ | |
82 | static wchar_t *privid, *cid; | |
83 | ||
84 | static wchar_t **parseadc(wchar_t *cmdline) | |
85 | { | |
86 | wchar_t **ret; | |
87 | size_t retsize, retdata; | |
88 | wchar_t *p, *p2, *ep; | |
89 | wchar_t r; | |
90 | ssize_t len; | |
91 | ||
92 | ret = NULL; | |
93 | retsize = retdata = 0; | |
94 | p = cmdline; | |
95 | do { | |
96 | if((p2 = wcschr(p, L' ')) != NULL) | |
97 | *(p2++) = L'\0'; | |
98 | len = wcslen(p); | |
99 | for(ep = p; len > 0; ep++, len--) { | |
100 | if(*ep == L'\\') { | |
101 | if(ep[1] == L's') { | |
102 | r = L' '; | |
103 | } else if(ep[1] == L'n') { | |
104 | r = L'\n'; | |
105 | } else if(ep[1] == L'\\') { | |
106 | r = L'\\'; | |
107 | } else { | |
108 | memmove(ep, ep + 2, (len -= 2) * sizeof(*ep)); | |
109 | ep--; | |
110 | continue; | |
111 | } | |
112 | memmove(ep, ep + 1, --len * sizeof(*ep)); | |
113 | *ep = r; | |
114 | } | |
115 | } | |
116 | *ep = L'\0'; | |
117 | addtobuf(ret, swcsdup(p)); | |
118 | p = p2; | |
119 | } while(p2 != NULL); | |
120 | addtobuf(ret, NULL); | |
121 | return(ret); | |
122 | } | |
123 | ||
124 | static void sendeoc(struct socket *sk) | |
125 | { | |
126 | sockqueue(sk, "\n", 1); | |
127 | } | |
128 | ||
129 | static void sendadc1(struct socket *sk, int sep, wchar_t *arg) | |
130 | { | |
131 | char *mbsbuf; | |
132 | wchar_t *buf; | |
133 | size_t bufsize, bufdata; | |
134 | ||
135 | buf = NULL; | |
136 | bufsize = bufdata = 0; | |
137 | if(sep) | |
138 | addtobuf(buf, L' '); | |
139 | for(; *arg != L'\0'; arg++) { | |
140 | if(*arg == L' ') | |
141 | bufcat(buf, L"\\s", 2); | |
142 | else if(*arg == L'\n') | |
143 | bufcat(buf, L"\\n", 2); | |
144 | else if(*arg == L'\\') | |
145 | bufcat(buf, L"\\\\", 2); | |
146 | else | |
147 | addtobuf(buf, *arg); | |
148 | } | |
149 | addtobuf(buf, L'\0'); | |
150 | mbsbuf = icwcstombs(buf, "utf-8"); | |
151 | sockqueue(sk, mbsbuf, strlen(mbsbuf)); | |
152 | free(mbsbuf); | |
153 | } | |
154 | ||
155 | static void sendadc(struct socket *sk, int sep, ...) | |
156 | { | |
157 | va_list args; | |
158 | wchar_t *arg; | |
159 | int i; | |
160 | ||
161 | va_start(args, sep); | |
162 | for(i = 0; (arg = va_arg(args, wchar_t *)) != NULL; i++) { | |
163 | if(arg == eoc) | |
164 | sendeoc(sk); | |
165 | else | |
166 | sendadc1(sk, (i == 0)?sep:1, arg); | |
167 | } | |
168 | va_end(args); | |
169 | } | |
170 | ||
ed63a7f8 | 171 | static struct qcmd *newqcmd(struct qcmdqueue *queue, wchar_t **args) |
58e83d6a | 172 | { |
173 | struct qcmd *new; | |
174 | ||
58e83d6a | 175 | new = smalloc(sizeof(*new)); |
176 | new->next = NULL; | |
177 | new->args = args; | |
ed63a7f8 FT |
178 | if(queue->l == NULL) |
179 | queue->f = new; | |
180 | else | |
181 | queue->l->next = new; | |
182 | queue->l = new; | |
183 | queue->size++; | |
58e83d6a | 184 | return(new); |
185 | } | |
186 | ||
ed63a7f8 | 187 | static struct qcmd *ulqcmd(struct qcmdqueue *queue) |
58e83d6a | 188 | { |
189 | struct qcmd *ret; | |
190 | ||
ed63a7f8 | 191 | if((ret = queue->f) == NULL) |
58e83d6a | 192 | return(NULL); |
ed63a7f8 FT |
193 | if((queue->f = ret->next) == NULL) |
194 | queue->l = NULL; | |
195 | queue->size--; | |
58e83d6a | 196 | return(ret); |
197 | } | |
198 | ||
199 | static void freeqcmd(struct qcmd *qcmd) | |
200 | { | |
201 | freeparr(qcmd->args); | |
202 | free(qcmd); | |
203 | } | |
204 | ||
205 | #define ADC_CMDFN(name) static void name(struct fnetnode *fn, wchar_t *command, wchar_t *sender, int argc, wchar_t **argv) | |
0d6c5363 | 206 | #ifdef __GNUC__ |
9db779f4 | 207 | #define UNUSED __attribute__ ((unused)) |
0d6c5363 | 208 | #else |
9db779f4 | 209 | #define UNUSED |
0d6c5363 | 210 | #endif |
9db779f4 | 211 | #define ADC_CMDCOM \ |
ffa81d5f FT |
212 | struct adchub *hub UNUSED = fn->data; \ |
213 | struct socket *sk UNUSED = hub->sk; | |
58e83d6a | 214 | |
215 | ADC_CMDFN(cmd_sup) | |
216 | { | |
217 | ADC_CMDCOM; | |
218 | int i, o, f; | |
219 | ||
220 | for(i = 1; i < argc; i++) { | |
221 | if(wcslen(argv[i]) < 3) | |
222 | continue; | |
223 | for(o = 0, f = 0; hub->sup[o]; o++) { | |
224 | if(!wcscmp(argv[i] + 2, hub->sup[o])) { | |
225 | f = 1; | |
226 | break; | |
227 | } | |
228 | } | |
229 | if(!wcsncmp(argv[i], L"AD", 2)) { | |
230 | if(f) | |
231 | continue; | |
232 | hub->sup = srealloc(hub->sup, sizeof(*(hub->sup)) * (o + 1)); | |
233 | hub->sup[o] = swcsdup(argv[i] + 2); | |
234 | } else if(!wcsncmp(argv[i], L"RM", 2)) { | |
235 | if(!f) | |
236 | continue; | |
24a794c2 | 237 | free(hub->sup[o]); |
58e83d6a | 238 | memmove(hub->sup[o], hub->sup[o + 1], parrlen(hub->sup) - o); |
239 | } | |
240 | } | |
241 | } | |
242 | ||
243 | ADC_CMDFN(cmd_sid) | |
244 | { | |
245 | ADC_CMDCOM; | |
246 | ||
247 | if(hub->sid != NULL) | |
248 | free(hub->sid); | |
249 | hub->sid = swcsdup(argv[1]); | |
250 | if(hub->state == ADC_PROTOCOL) { | |
251 | hub->state = ADC_IDENTIFY; | |
252 | } | |
253 | } | |
254 | ||
24a794c2 | 255 | ADC_CMDFN(cmd_inf) |
256 | { | |
257 | ADC_CMDCOM; | |
258 | ||
259 | if(sender == NULL) { | |
260 | ||
261 | } | |
262 | } | |
263 | ||
58e83d6a | 264 | static struct command hubcmds[] = { |
265 | {L"SUP", 1, 0, cmd_sup}, | |
266 | {L"SID", 2, 0, cmd_sid}, | |
24a794c2 | 267 | {L"INF", 0, 0, cmd_inf}, |
58e83d6a | 268 | {NULL, 0, 0, NULL} |
269 | }; | |
270 | ||
271 | static void dispatch(struct qcmd *qcmd, struct fnetnode *fn) | |
272 | { | |
273 | struct command *cmd; | |
274 | int argc; | |
275 | wchar_t *cmdnm, *sender, **argv; | |
276 | ||
277 | if((argc = parrlen(argv = qcmd->args)) < 1) | |
278 | return; | |
279 | cmdnm = *(argv++); | |
280 | argc--; | |
281 | if(wcslen(cmdnm) < 2) | |
282 | return; | |
283 | sender = NULL; | |
284 | if((*cmdnm == L'B') || (*cmdnm == L'F')) { | |
285 | if(argc < 1) | |
286 | return; | |
287 | sender = *(argv++); | |
288 | argc--; | |
289 | } else if((*cmdnm == L'D') || (*cmdnm == L'E')) { | |
290 | if(argc < 2) | |
291 | return; | |
292 | sender = *argv; | |
293 | argv += 2; | |
294 | argc -= 2; | |
295 | } | |
296 | for(cmd = hubcmds; cmd->func != NULL; cmd++) { | |
297 | if(!wcscmp(cmd->name, qcmd->args[0] + 1)) { | |
298 | if(argc < cmd->minargs) | |
299 | return; | |
300 | cmd->func(fn, cmdnm, sender, argc, qcmd->args); | |
301 | return; | |
302 | } | |
303 | } | |
304 | flog(LOG_DEBUG, "unknown adc command: %ls", qcmd->args[0]); | |
305 | } | |
306 | ||
cab0b442 | 307 | static void hubread(struct socket *sk, struct fnetnode *fn) |
58e83d6a | 308 | { |
309 | int ret; | |
310 | struct adchub *hub; | |
311 | char *newbuf, *p1, *p2; | |
312 | wchar_t *p; | |
313 | size_t datalen, cblen; | |
314 | ||
315 | hub = fn->data; | |
316 | if((newbuf = sockgetinbuf(sk, &datalen)) == NULL) | |
cab0b442 | 317 | return; |
58e83d6a | 318 | if(hub->inbufdata > 1024) |
319 | hub->inbufdata = 0; | |
320 | bufcat(hub->inbuf, newbuf, datalen); | |
321 | free(newbuf); | |
322 | /* Memory eating protection */ | |
323 | if(hub->cbdata > 65536) | |
324 | hub->cbdata = 0; | |
325 | while(hub->inbufdata > 0) { | |
326 | if(hub->cbdata == hub->cbsize) | |
327 | sizebuf2(hub->cb, hub->cbdata + datalen, 1); | |
328 | p1 = hub->inbuf; | |
329 | p2 = (char *)(hub->cb + hub->cbdata); | |
330 | cblen = sizeof(*(hub->cb)) * (hub->cbsize - hub->cbdata); | |
331 | ret = iconv(hub->ich, &p1, &hub->inbufdata, &p2, &cblen); | |
332 | memmove(hub->inbuf, p1, hub->inbufdata); | |
333 | if(((p2 - ((char *)hub->cb)) % sizeof(*hub->cb)) != 0) { | |
334 | flog(LOG_CRIT, "Spotted a dismembered wchar_t!"); | |
335 | abort(); | |
336 | } | |
337 | hub->cbdata = hub->cbsize - (cblen / sizeof(*(hub->cb))); | |
338 | if(ret < 0) { | |
339 | if(errno == EILSEQ) { | |
340 | flog(LOG_DEBUG, "adc fnetnode %i sent illegal utf-8 sequence", fn->id); | |
341 | killfnetnode(fn); | |
cab0b442 | 342 | return; |
58e83d6a | 343 | } else if(errno == EINVAL) { |
344 | break; | |
345 | } else if(errno == E2BIG) { | |
346 | /* continue; */ | |
347 | } else { | |
348 | flog(LOG_WARNING, "bug? iconv returned unexpected error: %s", strerror(errno)); | |
cab0b442 | 349 | return; |
58e83d6a | 350 | } |
351 | } | |
352 | } | |
353 | while((p = wmemchr(hub->cb, L'\n', hub->cbdata)) != NULL) { | |
354 | *(p++) = L'\0'; | |
355 | newqcmd(&hub->queue, parseadc(hub->cb)); | |
356 | memmove(hub->cb, p, (hub->cbdata -= (p - hub->cb)) * sizeof(*(hub->cb))); | |
357 | } | |
358 | } | |
359 | ||
cab0b442 | 360 | static void huberr(struct socket *sk, int err, struct fnetnode *fn) |
58e83d6a | 361 | { |
362 | killfnetnode(fn); | |
363 | } | |
364 | ||
ffa81d5f | 365 | static void hubconnect(struct fnetnode *fn, struct socket *sk) |
58e83d6a | 366 | { |
367 | struct adchub *hub; | |
368 | ||
ffa81d5f FT |
369 | sk->readcb = (void (*)(struct socket *, void *))hubread; |
370 | sk->errcb = (void (*)(struct socket *, int, void *))huberr; | |
371 | sk->data = fn; | |
58e83d6a | 372 | |
373 | hub = smalloc(sizeof(*hub)); | |
374 | memset(hub, 0, sizeof(*hub)); | |
70d8f2f1 | 375 | getsock(hub->sk = sk); |
58e83d6a | 376 | if((hub->ich = iconv_open("wchar_t", "utf-8")) == (iconv_t)-1) { |
377 | flog(LOG_CRIT, "iconv cannot handle UTF-8: %s", strerror(errno)); | |
378 | killfnetnode(fn); | |
379 | return; | |
380 | } | |
381 | fn->data = hub; | |
ffa81d5f | 382 | sendadc(sk, 0, L"HSUP", L"ADBASE", eoc, NULL); |
58e83d6a | 383 | } |
384 | ||
385 | static void hubdestroy(struct fnetnode *fn) | |
386 | { | |
387 | struct adchub *hub; | |
388 | ||
ffa81d5f | 389 | hub = fn->data; |
58e83d6a | 390 | iconv_close(hub->ich); |
391 | if(hub->inbuf != NULL) | |
392 | free(hub->inbuf); | |
393 | if(hub->sup != NULL) | |
394 | freeparr(hub->sup); | |
395 | free(hub); | |
396 | } | |
397 | ||
ffa81d5f FT |
398 | static void hubkill(struct fnetnode *fn) |
399 | { | |
400 | struct adchub *hub; | |
401 | ||
402 | hub = fn->data; | |
403 | hub->sk->close = 1; | |
404 | } | |
405 | ||
58e83d6a | 406 | static int hubsetnick(struct fnetnode *fn, wchar_t *newnick) |
407 | { | |
408 | return(0); | |
409 | } | |
410 | ||
411 | static int hubreqconn(struct fnetpeer *peer) | |
412 | { | |
413 | return(0); | |
414 | } | |
415 | ||
3ad44ea7 | 416 | static struct fnet adcnet_store = { |
58e83d6a | 417 | .connect = hubconnect, |
418 | .destroy = hubdestroy, | |
ffa81d5f | 419 | .kill = hubkill, |
58e83d6a | 420 | .setnick = hubsetnick, |
421 | .reqconn = hubreqconn, | |
422 | .name = L"adc" | |
423 | }; | |
424 | ||
3ad44ea7 | 425 | static struct fnet *adcnet = &adcnet_store; |
426 | ||
58e83d6a | 427 | static int run(void) |
428 | { | |
429 | int ret; | |
430 | struct fnetnode *fn, *nextfn; | |
431 | struct adchub *hub; | |
432 | struct qcmd *qcmd; | |
433 | ||
434 | ret = 0; | |
435 | for(fn = fnetnodes; fn != NULL; fn = nextfn) { | |
436 | nextfn = fn->next; | |
3ad44ea7 | 437 | if(fn->fnet != adcnet) |
58e83d6a | 438 | continue; |
439 | if((hub = fn->data) == NULL) | |
440 | continue; | |
441 | if((qcmd = ulqcmd(&hub->queue)) != NULL) { | |
ffa81d5f | 442 | if((hub->sk != NULL) && (hub->sk->state == SOCK_EST)) |
58e83d6a | 443 | dispatch(qcmd, fn); |
444 | freeqcmd(qcmd); | |
445 | ret = 1; | |
446 | break; | |
447 | } | |
448 | } | |
449 | return(ret); | |
450 | } | |
451 | ||
452 | static void preinit(int hup) | |
453 | { | |
454 | if(hup) | |
455 | return; | |
3ad44ea7 | 456 | regfnet(adcnet); |
58e83d6a | 457 | } |
458 | ||
459 | static int init(int hup) | |
460 | { | |
461 | int i; | |
462 | char idbuf[24], *id32; | |
463 | struct tigerhash th; | |
464 | ||
465 | if(!hup) { | |
466 | eoc = swcsdup(L""); | |
467 | ||
468 | if((privid = fetchvar("adc.pid", NULL)) == NULL) { | |
469 | for(i = 0; i < sizeof(idbuf); i++) | |
470 | idbuf[i] = rand() % 256; | |
471 | id32 = base32encode(idbuf, sizeof(idbuf)); | |
472 | id32[39] = 0; | |
473 | privid = icmbstowcs(id32, "us-ascii"); | |
474 | free(id32); | |
475 | storevar("adc.pid", privid, sizeof(*privid) * (wcslen(privid) + 1)); | |
476 | } | |
477 | ||
478 | id32 = base32decode(icswcstombs(privid, "us-ascii", NULL), NULL); | |
479 | inittiger(&th); | |
480 | dotiger(&th, id32, 24); | |
481 | synctiger(&th); | |
482 | free(id32); | |
483 | restiger(&th, idbuf); | |
484 | id32 = base32encode(idbuf, sizeof(idbuf)); | |
485 | id32[39] = 0; | |
486 | cid = icmbstowcs(id32, "us-ascii"); | |
487 | free(id32); | |
488 | } | |
489 | return(0); | |
490 | } | |
491 | ||
492 | static void terminate(void) | |
493 | { | |
494 | ||
495 | } | |
496 | ||
497 | static struct configvar myvars[] = { | |
d9f89ef5 | 498 | /** Specifies a specific UDP port to use for ADC search |
499 | * results. If left unspecified, a port is allocated | |
500 | * dynamically. Useful for NAT routers (see also the | |
501 | * net.visibleipv4 address for those cases). */ | |
58e83d6a | 502 | {CONF_VAR_INT, "udpport", {.num = 0}}, |
d9f89ef5 | 503 | /** Specifies a specific TCP port to use for ADC peer |
504 | * connections. If left unspecified, a port is allocated | |
505 | * dynamically. Useful for NAT routers (see also the | |
506 | * net.visibleipv4 address for those cases). */ | |
58e83d6a | 507 | {CONF_VAR_INT, "tcpport", {.num = 0}}, |
508 | {CONF_VAR_END} | |
509 | }; | |
510 | ||
511 | static struct module me = { | |
512 | .conf = { | |
513 | .vars = myvars | |
514 | }, | |
515 | .preinit = preinit, | |
516 | .init = init, | |
517 | .run = run, | |
518 | .terminate = terminate, | |
519 | .name = "adc" | |
520 | }; | |
521 | ||
522 | MODULE(me) |