Commit | Line | Data |
---|---|---|
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> | |
6adc02a2 | 22 | #include <fcntl.h> |
58e83d6a | 23 | #include <stdarg.h> |
24 | #include <string.h> | |
25 | #include <netinet/in.h> | |
26 | #include <arpa/inet.h> | |
27 | #include <wctype.h> | |
28 | #include <iconv.h> | |
29 | #include <errno.h> | |
30 | ||
31 | #ifdef HAVE_CONFIG_H | |
32 | #include <config.h> | |
33 | #endif | |
34 | #include "filenet.h" | |
35 | #include "log.h" | |
36 | #include "module.h" | |
37 | #include "utils.h" | |
38 | #include "client.h" | |
39 | #include "transfer.h" | |
40 | #include "sysevents.h" | |
41 | #include "net.h" | |
24a794c2 | 42 | #include <tiger.h> |
58e83d6a | 43 | |
44 | /* Protocol states */ | |
45 | #define ADC_PROTOCOL 0 | |
46 | #define ADC_IDENTIFY 1 | |
47 | #define ADC_VERIFY 2 | |
48 | #define ADC_NORMAL 3 | |
49 | #define ADC_DATA 4 | |
50 | ||
51 | struct command { | |
52 | wchar_t *name; | |
53 | int minargs, needsender; | |
54 | void (*func)(struct fnetnode *fn, wchar_t *command, wchar_t *sender, int argc, wchar_t **argv); | |
55 | }; | |
56 | ||
57 | struct qcmd { | |
58 | struct qcmd *next; | |
59 | wchar_t **args; | |
60 | }; | |
61 | ||
ed63a7f8 FT |
62 | struct qcmdqueue { |
63 | struct qcmd *f, *l; | |
64 | int size; | |
65 | }; | |
66 | ||
58e83d6a | 67 | struct adchub { |
ffa81d5f | 68 | struct socket *sk; |
58e83d6a | 69 | char *inbuf; |
70 | size_t inbufdata, inbufsize; | |
71 | wchar_t *sid; | |
72 | wchar_t *cb; | |
73 | size_t cbdata, cbsize; | |
74 | wchar_t **sup; | |
75 | iconv_t ich; | |
76 | int state; | |
24a794c2 | 77 | struct wcspair *hubinf; |
ed63a7f8 | 78 | struct qcmdqueue queue; |
58e83d6a | 79 | }; |
80 | ||
81 | static wchar_t *eoc; | |
82 | /* I've never understood why both of these are necessary, but... */ | |
83 | static wchar_t *privid, *cid; | |
84 | ||
85 | static wchar_t **parseadc(wchar_t *cmdline) | |
86 | { | |
87 | wchar_t **ret; | |
88 | size_t retsize, retdata; | |
89 | wchar_t *p, *p2, *ep; | |
90 | wchar_t r; | |
91 | ssize_t len; | |
92 | ||
93 | ret = NULL; | |
94 | retsize = retdata = 0; | |
95 | p = cmdline; | |
96 | do { | |
97 | if((p2 = wcschr(p, L' ')) != NULL) | |
98 | *(p2++) = L'\0'; | |
99 | len = wcslen(p); | |
100 | for(ep = p; len > 0; ep++, len--) { | |
101 | if(*ep == L'\\') { | |
102 | if(ep[1] == L's') { | |
103 | r = L' '; | |
104 | } else if(ep[1] == L'n') { | |
105 | r = L'\n'; | |
106 | } else if(ep[1] == L'\\') { | |
107 | r = L'\\'; | |
108 | } else { | |
109 | memmove(ep, ep + 2, (len -= 2) * sizeof(*ep)); | |
110 | ep--; | |
111 | continue; | |
112 | } | |
113 | memmove(ep, ep + 1, --len * sizeof(*ep)); | |
114 | *ep = r; | |
115 | } | |
116 | } | |
117 | *ep = L'\0'; | |
118 | addtobuf(ret, swcsdup(p)); | |
119 | p = p2; | |
120 | } while(p2 != NULL); | |
121 | addtobuf(ret, NULL); | |
122 | return(ret); | |
123 | } | |
124 | ||
125 | static void sendeoc(struct socket *sk) | |
126 | { | |
127 | sockqueue(sk, "\n", 1); | |
128 | } | |
129 | ||
130 | static void sendadc1(struct socket *sk, int sep, wchar_t *arg) | |
131 | { | |
132 | char *mbsbuf; | |
133 | wchar_t *buf; | |
134 | size_t bufsize, bufdata; | |
135 | ||
136 | buf = NULL; | |
137 | bufsize = bufdata = 0; | |
138 | if(sep) | |
139 | addtobuf(buf, L' '); | |
140 | for(; *arg != L'\0'; arg++) { | |
141 | if(*arg == L' ') | |
142 | bufcat(buf, L"\\s", 2); | |
143 | else if(*arg == L'\n') | |
144 | bufcat(buf, L"\\n", 2); | |
145 | else if(*arg == L'\\') | |
146 | bufcat(buf, L"\\\\", 2); | |
147 | else | |
148 | addtobuf(buf, *arg); | |
149 | } | |
150 | addtobuf(buf, L'\0'); | |
151 | mbsbuf = icwcstombs(buf, "utf-8"); | |
152 | sockqueue(sk, mbsbuf, strlen(mbsbuf)); | |
153 | free(mbsbuf); | |
154 | } | |
155 | ||
156 | static void sendadc(struct socket *sk, int sep, ...) | |
157 | { | |
158 | va_list args; | |
159 | wchar_t *arg; | |
160 | int i; | |
161 | ||
162 | va_start(args, sep); | |
163 | for(i = 0; (arg = va_arg(args, wchar_t *)) != NULL; i++) { | |
164 | if(arg == eoc) | |
165 | sendeoc(sk); | |
166 | else | |
167 | sendadc1(sk, (i == 0)?sep:1, arg); | |
168 | } | |
169 | va_end(args); | |
170 | } | |
171 | ||
ed63a7f8 | 172 | static struct qcmd *newqcmd(struct qcmdqueue *queue, wchar_t **args) |
58e83d6a | 173 | { |
174 | struct qcmd *new; | |
175 | ||
58e83d6a | 176 | new = smalloc(sizeof(*new)); |
177 | new->next = NULL; | |
178 | new->args = args; | |
ed63a7f8 FT |
179 | if(queue->l == NULL) |
180 | queue->f = new; | |
181 | else | |
182 | queue->l->next = new; | |
183 | queue->l = new; | |
184 | queue->size++; | |
58e83d6a | 185 | return(new); |
186 | } | |
187 | ||
ed63a7f8 | 188 | static struct qcmd *ulqcmd(struct qcmdqueue *queue) |
58e83d6a | 189 | { |
190 | struct qcmd *ret; | |
191 | ||
ed63a7f8 | 192 | if((ret = queue->f) == NULL) |
58e83d6a | 193 | return(NULL); |
ed63a7f8 FT |
194 | if((queue->f = ret->next) == NULL) |
195 | queue->l = NULL; | |
196 | queue->size--; | |
58e83d6a | 197 | return(ret); |
198 | } | |
199 | ||
200 | static void freeqcmd(struct qcmd *qcmd) | |
201 | { | |
202 | freeparr(qcmd->args); | |
203 | free(qcmd); | |
204 | } | |
205 | ||
206 | #define ADC_CMDFN(name) static void name(struct fnetnode *fn, wchar_t *command, wchar_t *sender, int argc, wchar_t **argv) | |
0d6c5363 | 207 | #ifdef __GNUC__ |
9db779f4 | 208 | #define UNUSED __attribute__ ((unused)) |
0d6c5363 | 209 | #else |
9db779f4 | 210 | #define UNUSED |
0d6c5363 | 211 | #endif |
9db779f4 | 212 | #define ADC_CMDCOM \ |
ffa81d5f FT |
213 | struct adchub *hub UNUSED = fn->data; \ |
214 | struct socket *sk UNUSED = hub->sk; | |
58e83d6a | 215 | |
216 | ADC_CMDFN(cmd_sup) | |
217 | { | |
218 | ADC_CMDCOM; | |
219 | int i, o, f; | |
220 | ||
221 | for(i = 1; i < argc; i++) { | |
222 | if(wcslen(argv[i]) < 3) | |
223 | continue; | |
224 | for(o = 0, f = 0; hub->sup[o]; o++) { | |
225 | if(!wcscmp(argv[i] + 2, hub->sup[o])) { | |
226 | f = 1; | |
227 | break; | |
228 | } | |
229 | } | |
230 | if(!wcsncmp(argv[i], L"AD", 2)) { | |
231 | if(f) | |
232 | continue; | |
233 | hub->sup = srealloc(hub->sup, sizeof(*(hub->sup)) * (o + 1)); | |
234 | hub->sup[o] = swcsdup(argv[i] + 2); | |
235 | } else if(!wcsncmp(argv[i], L"RM", 2)) { | |
236 | if(!f) | |
237 | continue; | |
24a794c2 | 238 | free(hub->sup[o]); |
58e83d6a | 239 | memmove(hub->sup[o], hub->sup[o + 1], parrlen(hub->sup) - o); |
240 | } | |
241 | } | |
242 | } | |
243 | ||
244 | ADC_CMDFN(cmd_sid) | |
245 | { | |
246 | ADC_CMDCOM; | |
247 | ||
248 | if(hub->sid != NULL) | |
249 | free(hub->sid); | |
250 | hub->sid = swcsdup(argv[1]); | |
251 | if(hub->state == ADC_PROTOCOL) { | |
252 | hub->state = ADC_IDENTIFY; | |
253 | } | |
254 | } | |
255 | ||
24a794c2 | 256 | ADC_CMDFN(cmd_inf) |
257 | { | |
258 | ADC_CMDCOM; | |
259 | ||
260 | if(sender == NULL) { | |
261 | ||
262 | } | |
263 | } | |
264 | ||
58e83d6a | 265 | static struct command hubcmds[] = { |
266 | {L"SUP", 1, 0, cmd_sup}, | |
267 | {L"SID", 2, 0, cmd_sid}, | |
24a794c2 | 268 | {L"INF", 0, 0, cmd_inf}, |
58e83d6a | 269 | {NULL, 0, 0, NULL} |
270 | }; | |
271 | ||
272 | static void dispatch(struct qcmd *qcmd, struct fnetnode *fn) | |
273 | { | |
274 | struct command *cmd; | |
275 | int argc; | |
276 | wchar_t *cmdnm, *sender, **argv; | |
277 | ||
278 | if((argc = parrlen(argv = qcmd->args)) < 1) | |
279 | return; | |
280 | cmdnm = *(argv++); | |
281 | argc--; | |
282 | if(wcslen(cmdnm) < 2) | |
283 | return; | |
284 | sender = NULL; | |
285 | if((*cmdnm == L'B') || (*cmdnm == L'F')) { | |
286 | if(argc < 1) | |
287 | return; | |
288 | sender = *(argv++); | |
289 | argc--; | |
290 | } else if((*cmdnm == L'D') || (*cmdnm == L'E')) { | |
291 | if(argc < 2) | |
292 | return; | |
293 | sender = *argv; | |
294 | argv += 2; | |
295 | argc -= 2; | |
296 | } | |
297 | for(cmd = hubcmds; cmd->func != NULL; cmd++) { | |
298 | if(!wcscmp(cmd->name, qcmd->args[0] + 1)) { | |
299 | if(argc < cmd->minargs) | |
300 | return; | |
6adc02a2 | 301 | cmd->func(fn, cmdnm, sender, argc, argv); |
58e83d6a | 302 | return; |
303 | } | |
304 | } | |
305 | flog(LOG_DEBUG, "unknown adc command: %ls", qcmd->args[0]); | |
306 | } | |
307 | ||
cab0b442 | 308 | static void hubread(struct socket *sk, struct fnetnode *fn) |
58e83d6a | 309 | { |
310 | int ret; | |
311 | struct adchub *hub; | |
312 | char *newbuf, *p1, *p2; | |
313 | wchar_t *p; | |
314 | size_t datalen, cblen; | |
315 | ||
316 | hub = fn->data; | |
317 | if((newbuf = sockgetinbuf(sk, &datalen)) == NULL) | |
cab0b442 | 318 | return; |
58e83d6a | 319 | if(hub->inbufdata > 1024) |
320 | hub->inbufdata = 0; | |
321 | bufcat(hub->inbuf, newbuf, datalen); | |
322 | free(newbuf); | |
323 | /* Memory eating protection */ | |
324 | if(hub->cbdata > 65536) | |
325 | hub->cbdata = 0; | |
326 | while(hub->inbufdata > 0) { | |
327 | if(hub->cbdata == hub->cbsize) | |
328 | sizebuf2(hub->cb, hub->cbdata + datalen, 1); | |
329 | p1 = hub->inbuf; | |
330 | p2 = (char *)(hub->cb + hub->cbdata); | |
331 | cblen = sizeof(*(hub->cb)) * (hub->cbsize - hub->cbdata); | |
332 | ret = iconv(hub->ich, &p1, &hub->inbufdata, &p2, &cblen); | |
333 | memmove(hub->inbuf, p1, hub->inbufdata); | |
334 | if(((p2 - ((char *)hub->cb)) % sizeof(*hub->cb)) != 0) { | |
335 | flog(LOG_CRIT, "Spotted a dismembered wchar_t!"); | |
336 | abort(); | |
337 | } | |
338 | hub->cbdata = hub->cbsize - (cblen / sizeof(*(hub->cb))); | |
339 | if(ret < 0) { | |
340 | if(errno == EILSEQ) { | |
341 | flog(LOG_DEBUG, "adc fnetnode %i sent illegal utf-8 sequence", fn->id); | |
342 | killfnetnode(fn); | |
cab0b442 | 343 | return; |
58e83d6a | 344 | } else if(errno == EINVAL) { |
345 | break; | |
346 | } else if(errno == E2BIG) { | |
347 | /* continue; */ | |
348 | } else { | |
349 | flog(LOG_WARNING, "bug? iconv returned unexpected error: %s", strerror(errno)); | |
cab0b442 | 350 | return; |
58e83d6a | 351 | } |
352 | } | |
353 | } | |
354 | while((p = wmemchr(hub->cb, L'\n', hub->cbdata)) != NULL) { | |
355 | *(p++) = L'\0'; | |
356 | newqcmd(&hub->queue, parseadc(hub->cb)); | |
357 | memmove(hub->cb, p, (hub->cbdata -= (p - hub->cb)) * sizeof(*(hub->cb))); | |
358 | } | |
359 | } | |
360 | ||
cab0b442 | 361 | static void huberr(struct socket *sk, int err, struct fnetnode *fn) |
58e83d6a | 362 | { |
363 | killfnetnode(fn); | |
364 | } | |
365 | ||
ffa81d5f | 366 | static void hubconnect(struct fnetnode *fn, struct socket *sk) |
58e83d6a | 367 | { |
368 | struct adchub *hub; | |
369 | ||
ffa81d5f FT |
370 | sk->readcb = (void (*)(struct socket *, void *))hubread; |
371 | sk->errcb = (void (*)(struct socket *, int, void *))huberr; | |
372 | sk->data = fn; | |
58e83d6a | 373 | |
374 | hub = smalloc(sizeof(*hub)); | |
375 | memset(hub, 0, sizeof(*hub)); | |
70d8f2f1 | 376 | getsock(hub->sk = sk); |
58e83d6a | 377 | if((hub->ich = iconv_open("wchar_t", "utf-8")) == (iconv_t)-1) { |
378 | flog(LOG_CRIT, "iconv cannot handle UTF-8: %s", strerror(errno)); | |
379 | killfnetnode(fn); | |
380 | return; | |
381 | } | |
382 | fn->data = hub; | |
6adc02a2 | 383 | sendadc(sk, 0, L"HSUP", L"ADBASE", L"ADTIGR", eoc, NULL); |
58e83d6a | 384 | } |
385 | ||
386 | static void hubdestroy(struct fnetnode *fn) | |
387 | { | |
388 | struct adchub *hub; | |
389 | ||
ffa81d5f | 390 | hub = fn->data; |
58e83d6a | 391 | iconv_close(hub->ich); |
392 | if(hub->inbuf != NULL) | |
393 | free(hub->inbuf); | |
394 | if(hub->sup != NULL) | |
395 | freeparr(hub->sup); | |
396 | free(hub); | |
397 | } | |
398 | ||
ffa81d5f FT |
399 | static void hubkill(struct fnetnode *fn) |
400 | { | |
401 | struct adchub *hub; | |
402 | ||
403 | hub = fn->data; | |
404 | hub->sk->close = 1; | |
405 | } | |
406 | ||
58e83d6a | 407 | static int hubsetnick(struct fnetnode *fn, wchar_t *newnick) |
408 | { | |
409 | return(0); | |
410 | } | |
411 | ||
412 | static int hubreqconn(struct fnetpeer *peer) | |
413 | { | |
414 | return(0); | |
415 | } | |
416 | ||
3ad44ea7 | 417 | static struct fnet adcnet_store = { |
58e83d6a | 418 | .connect = hubconnect, |
419 | .destroy = hubdestroy, | |
ffa81d5f | 420 | .kill = hubkill, |
58e83d6a | 421 | .setnick = hubsetnick, |
422 | .reqconn = hubreqconn, | |
423 | .name = L"adc" | |
424 | }; | |
425 | ||
3ad44ea7 | 426 | static struct fnet *adcnet = &adcnet_store; |
427 | ||
58e83d6a | 428 | static int run(void) |
429 | { | |
430 | int ret; | |
431 | struct fnetnode *fn, *nextfn; | |
432 | struct adchub *hub; | |
433 | struct qcmd *qcmd; | |
434 | ||
435 | ret = 0; | |
436 | for(fn = fnetnodes; fn != NULL; fn = nextfn) { | |
437 | nextfn = fn->next; | |
3ad44ea7 | 438 | if(fn->fnet != adcnet) |
58e83d6a | 439 | continue; |
440 | if((hub = fn->data) == NULL) | |
441 | continue; | |
442 | if((qcmd = ulqcmd(&hub->queue)) != NULL) { | |
ffa81d5f | 443 | if((hub->sk != NULL) && (hub->sk->state == SOCK_EST)) |
58e83d6a | 444 | dispatch(qcmd, fn); |
445 | freeqcmd(qcmd); | |
446 | ret = 1; | |
447 | break; | |
448 | } | |
449 | } | |
450 | return(ret); | |
451 | } | |
452 | ||
453 | static void preinit(int hup) | |
454 | { | |
455 | if(hup) | |
456 | return; | |
3ad44ea7 | 457 | regfnet(adcnet); |
58e83d6a | 458 | } |
459 | ||
6adc02a2 | 460 | static void makepid(char *idbuf) |
58e83d6a | 461 | { |
462 | int i; | |
6adc02a2 FT |
463 | int fd, ret; |
464 | ||
465 | i = 0; | |
466 | if((fd = open("/dev/urandom", O_RDONLY)) >= 0) { | |
467 | for(i = 0; i < 24; i += ret) { | |
468 | if((ret = read(fd, idbuf + i, 24 - i)) <= 0) { | |
469 | flog(LOG_WARNING, "could not read random data from /dev/urandom for ADC PID: %s", (errno == 0)?"EOF":strerror(errno)); | |
470 | break; | |
471 | } | |
472 | } | |
473 | close(fd); | |
474 | } else { | |
475 | flog(LOG_WARNING, "could not open /dev/urandom: %s", strerror(errno)); | |
476 | } | |
477 | if(i != 24) { | |
478 | for(i = 0; i < sizeof(idbuf); i++) | |
479 | idbuf[i] = rand() % 256; | |
480 | } | |
481 | } | |
482 | ||
483 | static int init(int hup) | |
484 | { | |
58e83d6a | 485 | char idbuf[24], *id32; |
486 | struct tigerhash th; | |
487 | ||
488 | if(!hup) { | |
489 | eoc = swcsdup(L""); | |
490 | ||
491 | if((privid = fetchvar("adc.pid", NULL)) == NULL) { | |
6adc02a2 | 492 | makepid(idbuf); |
58e83d6a | 493 | id32 = base32encode(idbuf, sizeof(idbuf)); |
494 | id32[39] = 0; | |
495 | privid = icmbstowcs(id32, "us-ascii"); | |
496 | free(id32); | |
497 | storevar("adc.pid", privid, sizeof(*privid) * (wcslen(privid) + 1)); | |
498 | } | |
499 | ||
500 | id32 = base32decode(icswcstombs(privid, "us-ascii", NULL), NULL); | |
501 | inittiger(&th); | |
502 | dotiger(&th, id32, 24); | |
503 | synctiger(&th); | |
504 | free(id32); | |
505 | restiger(&th, idbuf); | |
506 | id32 = base32encode(idbuf, sizeof(idbuf)); | |
507 | id32[39] = 0; | |
508 | cid = icmbstowcs(id32, "us-ascii"); | |
509 | free(id32); | |
510 | } | |
511 | return(0); | |
512 | } | |
513 | ||
514 | static void terminate(void) | |
515 | { | |
516 | ||
517 | } | |
518 | ||
519 | static struct configvar myvars[] = { | |
d9f89ef5 | 520 | /** Specifies a specific UDP port to use for ADC search |
521 | * results. If left unspecified, a port is allocated | |
522 | * dynamically. Useful for NAT routers (see also the | |
523 | * net.visibleipv4 address for those cases). */ | |
58e83d6a | 524 | {CONF_VAR_INT, "udpport", {.num = 0}}, |
d9f89ef5 | 525 | /** Specifies a specific TCP port to use for ADC peer |
526 | * connections. If left unspecified, a port is allocated | |
527 | * dynamically. Useful for NAT routers (see also the | |
528 | * net.visibleipv4 address for those cases). */ | |
58e83d6a | 529 | {CONF_VAR_INT, "tcpport", {.num = 0}}, |
530 | {CONF_VAR_END} | |
531 | }; | |
532 | ||
533 | static struct module me = { | |
534 | .conf = { | |
535 | .vars = myvars | |
536 | }, | |
537 | .preinit = preinit, | |
538 | .init = init, | |
539 | .run = run, | |
540 | .terminate = terminate, | |
541 | .name = "adc" | |
542 | }; | |
543 | ||
544 | MODULE(me) |