| 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 | struct socket *sk; |
| 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; |
| 71 | struct wcspair *hubinf; |
| 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) |
| 196 | #ifdef __GNUC__ |
| 197 | #define UNUSED __attribute__ ((unused)) |
| 198 | #else |
| 199 | #define UNUSED |
| 200 | #endif |
| 201 | #define ADC_CMDCOM \ |
| 202 | struct adchub *hub UNUSED = fn->data; \ |
| 203 | struct socket *sk UNUSED = hub->sk; |
| 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; |
| 227 | free(hub->sup[o]); |
| 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 | |
| 245 | ADC_CMDFN(cmd_inf) |
| 246 | { |
| 247 | ADC_CMDCOM; |
| 248 | |
| 249 | if(sender == NULL) { |
| 250 | |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | static struct command hubcmds[] = { |
| 255 | {L"SUP", 1, 0, cmd_sup}, |
| 256 | {L"SID", 2, 0, cmd_sid}, |
| 257 | {L"INF", 0, 0, cmd_inf}, |
| 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 | |
| 297 | static void hubread(struct socket *sk, struct fnetnode *fn) |
| 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) |
| 307 | return; |
| 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); |
| 332 | return; |
| 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)); |
| 339 | return; |
| 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 | |
| 350 | static void huberr(struct socket *sk, int err, struct fnetnode *fn) |
| 351 | { |
| 352 | killfnetnode(fn); |
| 353 | } |
| 354 | |
| 355 | static void hubconnect(struct fnetnode *fn, struct socket *sk) |
| 356 | { |
| 357 | struct adchub *hub; |
| 358 | |
| 359 | sk->readcb = (void (*)(struct socket *, void *))hubread; |
| 360 | sk->errcb = (void (*)(struct socket *, int, void *))huberr; |
| 361 | sk->data = fn; |
| 362 | |
| 363 | hub = smalloc(sizeof(*hub)); |
| 364 | memset(hub, 0, sizeof(*hub)); |
| 365 | getsock(hub->sk = sk); |
| 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; |
| 372 | sendadc(sk, 0, L"HSUP", L"ADBASE", eoc, NULL); |
| 373 | } |
| 374 | |
| 375 | static void hubdestroy(struct fnetnode *fn) |
| 376 | { |
| 377 | struct adchub *hub; |
| 378 | |
| 379 | hub = fn->data; |
| 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 | |
| 388 | static void hubkill(struct fnetnode *fn) |
| 389 | { |
| 390 | struct adchub *hub; |
| 391 | |
| 392 | hub = fn->data; |
| 393 | hub->sk->close = 1; |
| 394 | } |
| 395 | |
| 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 | |
| 406 | static struct fnet adcnet_store = { |
| 407 | .connect = hubconnect, |
| 408 | .destroy = hubdestroy, |
| 409 | .kill = hubkill, |
| 410 | .setnick = hubsetnick, |
| 411 | .reqconn = hubreqconn, |
| 412 | .name = L"adc" |
| 413 | }; |
| 414 | |
| 415 | static struct fnet *adcnet = &adcnet_store; |
| 416 | |
| 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; |
| 427 | if(fn->fnet != adcnet) |
| 428 | continue; |
| 429 | if((hub = fn->data) == NULL) |
| 430 | continue; |
| 431 | if((qcmd = ulqcmd(&hub->queue)) != NULL) { |
| 432 | if((hub->sk != NULL) && (hub->sk->state == SOCK_EST)) |
| 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; |
| 446 | regfnet(adcnet); |
| 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[] = { |
| 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). */ |
| 492 | {CONF_VAR_INT, "udpport", {.num = 0}}, |
| 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). */ |
| 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) |