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