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