San Mehat | a430b2b | 2014-09-23 08:30:51 -0700 | [diff] [blame] | 1 | /* |
| 2 | * httpd.c - a simple HTTP server |
| 3 | */ |
| 4 | |
| 5 | /* |
| 6 | * Copyright (C) 2011-2012 Christian Beier <dontmind@freeshell.org> |
| 7 | * Copyright (C) 2002 RealVNC Ltd. |
| 8 | * Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved. |
| 9 | * |
| 10 | * This is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This software is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this software; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
| 23 | * USA. |
| 24 | */ |
| 25 | |
| 26 | #include <rfb/rfb.h> |
| 27 | |
| 28 | #include <ctype.h> |
| 29 | #ifdef LIBVNCSERVER_HAVE_UNISTD_H |
| 30 | #include <unistd.h> |
| 31 | #endif |
| 32 | #ifdef LIBVNCSERVER_HAVE_SYS_TYPES_H |
| 33 | #include <sys/types.h> |
| 34 | #endif |
| 35 | #ifdef LIBVNCSERVER_HAVE_FCNTL_H |
| 36 | #include <fcntl.h> |
| 37 | #endif |
| 38 | #include <errno.h> |
| 39 | |
| 40 | #ifdef WIN32 |
| 41 | #include <winsock.h> |
| 42 | #define close closesocket |
| 43 | #else |
| 44 | #ifdef LIBVNCSERVER_HAVE_SYS_TIME_H |
| 45 | #include <sys/time.h> |
| 46 | #endif |
| 47 | #ifdef LIBVNCSERVER_HAVE_SYS_SOCKET_H |
| 48 | #include <sys/socket.h> |
| 49 | #endif |
| 50 | #ifdef LIBVNCSERVER_HAVE_NETINET_IN_H |
| 51 | #include <netinet/in.h> |
| 52 | #include <netinet/tcp.h> |
| 53 | #include <netdb.h> |
| 54 | #include <arpa/inet.h> |
| 55 | #endif |
| 56 | #include <pwd.h> |
| 57 | #endif |
| 58 | |
| 59 | #ifdef USE_LIBWRAP |
| 60 | #include <tcpd.h> |
| 61 | #endif |
| 62 | |
| 63 | |
| 64 | #define NOT_FOUND_STR "HTTP/1.0 404 Not found\r\nConnection: close\r\n\r\n" \ |
| 65 | "<HEAD><TITLE>File Not Found</TITLE></HEAD>\n" \ |
| 66 | "<BODY><H1>File Not Found</H1></BODY>\n" |
| 67 | |
| 68 | #define INVALID_REQUEST_STR "HTTP/1.0 400 Invalid Request\r\nConnection: close\r\n\r\n" \ |
| 69 | "<HEAD><TITLE>Invalid Request</TITLE></HEAD>\n" \ |
| 70 | "<BODY><H1>Invalid request</H1></BODY>\n" |
| 71 | |
| 72 | #define OK_STR "HTTP/1.0 200 OK\r\nConnection: close\r\n\r\n" |
| 73 | #define OK_STR_HTML "HTTP/1.0 200 OK\r\nConnection: close\r\nContent-Type: text/html\r\n\r\n" |
| 74 | |
| 75 | |
| 76 | |
| 77 | static void httpProcessInput(rfbScreenInfoPtr screen); |
| 78 | static rfbBool compareAndSkip(char **ptr, const char *str); |
| 79 | static rfbBool parseParams(const char *request, char *result, int max_bytes); |
| 80 | static rfbBool validateString(char *str); |
| 81 | |
| 82 | #define BUF_SIZE 32768 |
| 83 | |
| 84 | static char buf[BUF_SIZE]; |
| 85 | static size_t buf_filled=0; |
| 86 | |
| 87 | /* |
| 88 | * httpInitSockets sets up the TCP socket to listen for HTTP connections. |
| 89 | */ |
| 90 | |
| 91 | void |
| 92 | rfbHttpInitSockets(rfbScreenInfoPtr rfbScreen) |
| 93 | { |
| 94 | if (rfbScreen->httpInitDone) |
| 95 | return; |
| 96 | |
| 97 | rfbScreen->httpInitDone = TRUE; |
| 98 | |
| 99 | if (!rfbScreen->httpDir) |
| 100 | return; |
| 101 | |
| 102 | if (rfbScreen->httpPort == 0) { |
| 103 | rfbScreen->httpPort = rfbScreen->port-100; |
| 104 | } |
| 105 | |
| 106 | if ((rfbScreen->httpListenSock = |
| 107 | rfbListenOnTCPPort(rfbScreen->httpPort, rfbScreen->listenInterface)) < 0) { |
| 108 | rfbLogPerror("ListenOnTCPPort"); |
| 109 | return; |
| 110 | } |
| 111 | rfbLog("Listening for HTTP connections on TCP port %d\n", rfbScreen->httpPort); |
| 112 | rfbLog(" URL http://%s:%d\n",rfbScreen->thisHost,rfbScreen->httpPort); |
| 113 | |
| 114 | #ifdef LIBVNCSERVER_IPv6 |
| 115 | if (rfbScreen->http6Port == 0) { |
| 116 | rfbScreen->http6Port = rfbScreen->ipv6port-100; |
| 117 | } |
| 118 | |
| 119 | if ((rfbScreen->httpListen6Sock |
| 120 | = rfbListenOnTCP6Port(rfbScreen->http6Port, rfbScreen->listen6Interface)) < 0) { |
| 121 | /* ListenOnTCP6Port has its own detailed error printout */ |
| 122 | return; |
| 123 | } |
| 124 | rfbLog("Listening for HTTP connections on TCP6 port %d\n", rfbScreen->http6Port); |
| 125 | rfbLog(" URL http://%s:%d\n",rfbScreen->thisHost,rfbScreen->http6Port); |
| 126 | #endif |
| 127 | } |
| 128 | |
| 129 | void rfbHttpShutdownSockets(rfbScreenInfoPtr rfbScreen) { |
| 130 | if(rfbScreen->httpSock>-1) { |
| 131 | close(rfbScreen->httpSock); |
| 132 | FD_CLR(rfbScreen->httpSock,&rfbScreen->allFds); |
| 133 | rfbScreen->httpSock=-1; |
| 134 | } |
| 135 | |
| 136 | if(rfbScreen->httpListenSock>-1) { |
| 137 | close(rfbScreen->httpListenSock); |
| 138 | FD_CLR(rfbScreen->httpListenSock,&rfbScreen->allFds); |
| 139 | rfbScreen->httpListenSock=-1; |
| 140 | } |
| 141 | |
| 142 | if(rfbScreen->httpListen6Sock>-1) { |
| 143 | close(rfbScreen->httpListen6Sock); |
| 144 | FD_CLR(rfbScreen->httpListen6Sock,&rfbScreen->allFds); |
| 145 | rfbScreen->httpListen6Sock=-1; |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | /* |
| 150 | * httpCheckFds is called from ProcessInputEvents to check for input on the |
| 151 | * HTTP socket(s). If there is input to process, httpProcessInput is called. |
| 152 | */ |
| 153 | |
| 154 | void |
| 155 | rfbHttpCheckFds(rfbScreenInfoPtr rfbScreen) |
| 156 | { |
| 157 | int nfds; |
| 158 | fd_set fds; |
| 159 | struct timeval tv; |
| 160 | #ifdef LIBVNCSERVER_IPv6 |
| 161 | struct sockaddr_storage addr; |
| 162 | #else |
| 163 | struct sockaddr_in addr; |
| 164 | #endif |
| 165 | socklen_t addrlen = sizeof(addr); |
| 166 | |
| 167 | if (!rfbScreen->httpDir) |
| 168 | return; |
| 169 | |
| 170 | if (rfbScreen->httpListenSock < 0) |
| 171 | return; |
| 172 | |
| 173 | FD_ZERO(&fds); |
| 174 | FD_SET(rfbScreen->httpListenSock, &fds); |
| 175 | if (rfbScreen->httpListen6Sock >= 0) { |
| 176 | FD_SET(rfbScreen->httpListen6Sock, &fds); |
| 177 | } |
| 178 | if (rfbScreen->httpSock >= 0) { |
| 179 | FD_SET(rfbScreen->httpSock, &fds); |
| 180 | } |
| 181 | tv.tv_sec = 0; |
| 182 | tv.tv_usec = 0; |
| 183 | nfds = select(max(rfbScreen->httpListen6Sock, max(rfbScreen->httpSock,rfbScreen->httpListenSock)) + 1, &fds, NULL, NULL, &tv); |
| 184 | if (nfds == 0) { |
| 185 | return; |
| 186 | } |
| 187 | if (nfds < 0) { |
| 188 | #ifdef WIN32 |
| 189 | errno = WSAGetLastError(); |
| 190 | #endif |
| 191 | if (errno != EINTR) |
| 192 | rfbLogPerror("httpCheckFds: select"); |
| 193 | return; |
| 194 | } |
| 195 | |
| 196 | if ((rfbScreen->httpSock >= 0) && FD_ISSET(rfbScreen->httpSock, &fds)) { |
| 197 | httpProcessInput(rfbScreen); |
| 198 | } |
| 199 | |
| 200 | if (FD_ISSET(rfbScreen->httpListenSock, &fds) || FD_ISSET(rfbScreen->httpListen6Sock, &fds)) { |
| 201 | if (rfbScreen->httpSock >= 0) close(rfbScreen->httpSock); |
| 202 | |
| 203 | if(FD_ISSET(rfbScreen->httpListenSock, &fds)) { |
| 204 | if ((rfbScreen->httpSock = accept(rfbScreen->httpListenSock, (struct sockaddr *)&addr, &addrlen)) < 0) { |
| 205 | rfbLogPerror("httpCheckFds: accept"); |
| 206 | return; |
| 207 | } |
| 208 | } |
| 209 | else if(FD_ISSET(rfbScreen->httpListen6Sock, &fds)) { |
| 210 | if ((rfbScreen->httpSock = accept(rfbScreen->httpListen6Sock, (struct sockaddr *)&addr, &addrlen)) < 0) { |
| 211 | rfbLogPerror("httpCheckFds: accept"); |
| 212 | return; |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | #ifdef USE_LIBWRAP |
| 217 | char host[1024]; |
| 218 | #ifdef LIBVNCSERVER_IPv6 |
| 219 | if(getnameinfo((struct sockaddr*)&addr, addrlen, host, sizeof(host), NULL, 0, NI_NUMERICHOST) != 0) { |
| 220 | rfbLogPerror("httpCheckFds: error in getnameinfo"); |
| 221 | host[0] = '\0'; |
| 222 | } |
| 223 | #else |
| 224 | memcpy(host, inet_ntoa(addr.sin_addr), sizeof(host)); |
| 225 | #endif |
| 226 | if(!hosts_ctl("vnc",STRING_UNKNOWN, host, |
| 227 | STRING_UNKNOWN)) { |
| 228 | rfbLog("Rejected HTTP connection from client %s\n", |
| 229 | host); |
| 230 | close(rfbScreen->httpSock); |
| 231 | rfbScreen->httpSock=-1; |
| 232 | return; |
| 233 | } |
| 234 | #endif |
| 235 | if(!rfbSetNonBlocking(rfbScreen->httpSock)) { |
| 236 | close(rfbScreen->httpSock); |
| 237 | rfbScreen->httpSock=-1; |
| 238 | return; |
| 239 | } |
| 240 | /*AddEnabledDevice(httpSock);*/ |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | |
| 245 | static void |
| 246 | httpCloseSock(rfbScreenInfoPtr rfbScreen) |
| 247 | { |
| 248 | close(rfbScreen->httpSock); |
| 249 | rfbScreen->httpSock = -1; |
| 250 | buf_filled = 0; |
| 251 | } |
| 252 | |
| 253 | static rfbClientRec cl; |
| 254 | |
| 255 | /* |
| 256 | * httpProcessInput is called when input is received on the HTTP socket. |
| 257 | */ |
| 258 | |
| 259 | static void |
| 260 | httpProcessInput(rfbScreenInfoPtr rfbScreen) |
| 261 | { |
| 262 | #ifdef LIBVNCSERVER_IPv6 |
| 263 | struct sockaddr_storage addr; |
| 264 | #else |
| 265 | struct sockaddr_in addr; |
| 266 | #endif |
| 267 | socklen_t addrlen = sizeof(addr); |
| 268 | char fullFname[512]; |
| 269 | char params[1024]; |
| 270 | char *ptr; |
| 271 | char *fname; |
| 272 | unsigned int maxFnameLen; |
| 273 | FILE* fd; |
| 274 | rfbBool performSubstitutions = FALSE; |
| 275 | char str[256+32]; |
| 276 | #ifndef WIN32 |
| 277 | char* user=getenv("USER"); |
| 278 | #endif |
| 279 | |
| 280 | cl.sock=rfbScreen->httpSock; |
| 281 | |
| 282 | if (strlen(rfbScreen->httpDir) > 255) { |
| 283 | rfbErr("-httpd directory too long\n"); |
| 284 | httpCloseSock(rfbScreen); |
| 285 | return; |
| 286 | } |
| 287 | strcpy(fullFname, rfbScreen->httpDir); |
| 288 | fname = &fullFname[strlen(fullFname)]; |
| 289 | maxFnameLen = 511 - strlen(fullFname); |
| 290 | |
| 291 | buf_filled=0; |
| 292 | |
| 293 | /* Read data from the HTTP client until we get a complete request. */ |
| 294 | while (1) { |
| 295 | ssize_t got; |
| 296 | |
| 297 | if (buf_filled > sizeof (buf)) { |
| 298 | rfbErr("httpProcessInput: HTTP request is too long\n"); |
| 299 | httpCloseSock(rfbScreen); |
| 300 | return; |
| 301 | } |
| 302 | |
| 303 | got = read (rfbScreen->httpSock, buf + buf_filled, |
| 304 | sizeof (buf) - buf_filled - 1); |
| 305 | |
| 306 | if (got <= 0) { |
| 307 | if (got == 0) { |
| 308 | rfbErr("httpd: premature connection close\n"); |
| 309 | } else { |
| 310 | #ifdef WIN32 |
| 311 | errno=WSAGetLastError(); |
| 312 | #endif |
| 313 | if (errno == EAGAIN) { |
| 314 | return; |
| 315 | } |
| 316 | rfbLogPerror("httpProcessInput: read"); |
| 317 | } |
| 318 | httpCloseSock(rfbScreen); |
| 319 | return; |
| 320 | } |
| 321 | |
| 322 | buf_filled += got; |
| 323 | buf[buf_filled] = '\0'; |
| 324 | |
| 325 | /* Is it complete yet (is there a blank line)? */ |
| 326 | if (strstr (buf, "\r\r") || strstr (buf, "\n\n") || |
| 327 | strstr (buf, "\r\n\r\n") || strstr (buf, "\n\r\n\r")) |
| 328 | break; |
| 329 | } |
| 330 | |
| 331 | |
| 332 | /* Process the request. */ |
| 333 | if(rfbScreen->httpEnableProxyConnect) { |
| 334 | const static char* PROXY_OK_STR = "HTTP/1.0 200 OK\r\nContent-Type: octet-stream\r\nPragma: no-cache\r\n\r\n"; |
| 335 | if(!strncmp(buf, "CONNECT ", 8)) { |
| 336 | if(atoi(strchr(buf, ':')+1)!=rfbScreen->port) { |
| 337 | rfbErr("httpd: CONNECT format invalid.\n"); |
| 338 | rfbWriteExact(&cl,INVALID_REQUEST_STR, strlen(INVALID_REQUEST_STR)); |
| 339 | httpCloseSock(rfbScreen); |
| 340 | return; |
| 341 | } |
| 342 | /* proxy connection */ |
| 343 | rfbLog("httpd: client asked for CONNECT\n"); |
| 344 | rfbWriteExact(&cl,PROXY_OK_STR,strlen(PROXY_OK_STR)); |
| 345 | rfbNewClientConnection(rfbScreen,rfbScreen->httpSock); |
| 346 | rfbScreen->httpSock = -1; |
| 347 | return; |
| 348 | } |
| 349 | if (!strncmp(buf, "GET ",4) && !strncmp(strchr(buf,'/'),"/proxied.connection HTTP/1.", 27)) { |
| 350 | /* proxy connection */ |
| 351 | rfbLog("httpd: client asked for /proxied.connection\n"); |
| 352 | rfbWriteExact(&cl,PROXY_OK_STR,strlen(PROXY_OK_STR)); |
| 353 | rfbNewClientConnection(rfbScreen,rfbScreen->httpSock); |
| 354 | rfbScreen->httpSock = -1; |
| 355 | return; |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | if (strncmp(buf, "GET ", 4)) { |
| 360 | rfbErr("httpd: no GET line\n"); |
| 361 | httpCloseSock(rfbScreen); |
| 362 | return; |
| 363 | } else { |
| 364 | /* Only use the first line. */ |
| 365 | buf[strcspn(buf, "\n\r")] = '\0'; |
| 366 | } |
| 367 | |
| 368 | if (strlen(buf) > maxFnameLen) { |
| 369 | rfbErr("httpd: GET line too long\n"); |
| 370 | httpCloseSock(rfbScreen); |
| 371 | return; |
| 372 | } |
| 373 | |
| 374 | if (sscanf(buf, "GET %s HTTP/1.", fname) != 1) { |
| 375 | rfbErr("httpd: couldn't parse GET line\n"); |
| 376 | httpCloseSock(rfbScreen); |
| 377 | return; |
| 378 | } |
| 379 | |
| 380 | if (fname[0] != '/') { |
| 381 | rfbErr("httpd: filename didn't begin with '/'\n"); |
| 382 | rfbWriteExact(&cl, NOT_FOUND_STR, strlen(NOT_FOUND_STR)); |
| 383 | httpCloseSock(rfbScreen); |
| 384 | return; |
| 385 | } |
| 386 | |
| 387 | |
| 388 | getpeername(rfbScreen->httpSock, (struct sockaddr *)&addr, &addrlen); |
| 389 | #ifdef LIBVNCSERVER_IPv6 |
| 390 | char host[1024]; |
| 391 | if(getnameinfo((struct sockaddr*)&addr, addrlen, host, sizeof(host), NULL, 0, NI_NUMERICHOST) != 0) { |
| 392 | rfbLogPerror("httpProcessInput: error in getnameinfo"); |
| 393 | } |
| 394 | rfbLog("httpd: get '%s' for %s\n", fname+1, host); |
| 395 | #else |
| 396 | rfbLog("httpd: get '%s' for %s\n", fname+1, |
| 397 | inet_ntoa(addr.sin_addr)); |
| 398 | #endif |
| 399 | |
| 400 | /* Extract parameters from the URL string if necessary */ |
| 401 | |
| 402 | params[0] = '\0'; |
| 403 | ptr = strchr(fname, '?'); |
| 404 | if (ptr != NULL) { |
| 405 | *ptr = '\0'; |
| 406 | if (!parseParams(&ptr[1], params, 1024)) { |
| 407 | params[0] = '\0'; |
| 408 | rfbErr("httpd: bad parameters in the URL\n"); |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | |
| 413 | /* If we were asked for '/', actually read the file index.vnc */ |
| 414 | |
| 415 | if (strcmp(fname, "/") == 0) { |
| 416 | strcpy(fname, "/index.vnc"); |
| 417 | rfbLog("httpd: defaulting to '%s'\n", fname+1); |
| 418 | } |
| 419 | |
| 420 | /* Substitutions are performed on files ending .vnc */ |
| 421 | |
| 422 | if (strlen(fname) >= 4 && strcmp(&fname[strlen(fname)-4], ".vnc") == 0) { |
| 423 | performSubstitutions = TRUE; |
| 424 | } |
| 425 | |
| 426 | /* Open the file */ |
| 427 | |
| 428 | if ((fd = fopen(fullFname, "r")) == 0) { |
| 429 | rfbLogPerror("httpProcessInput: open"); |
| 430 | rfbWriteExact(&cl, NOT_FOUND_STR, strlen(NOT_FOUND_STR)); |
| 431 | httpCloseSock(rfbScreen); |
| 432 | return; |
| 433 | } |
| 434 | |
| 435 | if(performSubstitutions) /* is the 'index.vnc' file */ |
| 436 | rfbWriteExact(&cl, OK_STR_HTML, strlen(OK_STR_HTML)); |
| 437 | else |
| 438 | rfbWriteExact(&cl, OK_STR, strlen(OK_STR)); |
| 439 | |
| 440 | while (1) { |
| 441 | int n = fread(buf, 1, BUF_SIZE-1, fd); |
| 442 | if (n < 0) { |
| 443 | rfbLogPerror("httpProcessInput: read"); |
| 444 | fclose(fd); |
| 445 | httpCloseSock(rfbScreen); |
| 446 | return; |
| 447 | } |
| 448 | |
| 449 | if (n == 0) |
| 450 | break; |
| 451 | |
| 452 | if (performSubstitutions) { |
| 453 | |
| 454 | /* Substitute $WIDTH, $HEIGHT, etc with the appropriate values. |
| 455 | This won't quite work properly if the .vnc file is longer than |
| 456 | BUF_SIZE, but it's reasonable to assume that .vnc files will |
| 457 | always be short. */ |
| 458 | |
| 459 | char *ptr = buf; |
| 460 | char *dollar; |
| 461 | buf[n] = 0; /* make sure it's null-terminated */ |
| 462 | |
| 463 | while ((dollar = strchr(ptr, '$'))!=NULL) { |
| 464 | rfbWriteExact(&cl, ptr, (dollar - ptr)); |
| 465 | |
| 466 | ptr = dollar; |
| 467 | |
| 468 | if (compareAndSkip(&ptr, "$WIDTH")) { |
| 469 | |
| 470 | sprintf(str, "%d", rfbScreen->width); |
| 471 | rfbWriteExact(&cl, str, strlen(str)); |
| 472 | |
| 473 | } else if (compareAndSkip(&ptr, "$HEIGHT")) { |
| 474 | |
| 475 | sprintf(str, "%d", rfbScreen->height); |
| 476 | rfbWriteExact(&cl, str, strlen(str)); |
| 477 | |
| 478 | } else if (compareAndSkip(&ptr, "$APPLETWIDTH")) { |
| 479 | |
| 480 | sprintf(str, "%d", rfbScreen->width); |
| 481 | rfbWriteExact(&cl, str, strlen(str)); |
| 482 | |
| 483 | } else if (compareAndSkip(&ptr, "$APPLETHEIGHT")) { |
| 484 | |
| 485 | sprintf(str, "%d", rfbScreen->height + 32); |
| 486 | rfbWriteExact(&cl, str, strlen(str)); |
| 487 | |
| 488 | } else if (compareAndSkip(&ptr, "$PORT")) { |
| 489 | |
| 490 | sprintf(str, "%d", rfbScreen->port); |
| 491 | rfbWriteExact(&cl, str, strlen(str)); |
| 492 | |
| 493 | } else if (compareAndSkip(&ptr, "$DESKTOP")) { |
| 494 | |
| 495 | rfbWriteExact(&cl, rfbScreen->desktopName, strlen(rfbScreen->desktopName)); |
| 496 | |
| 497 | } else if (compareAndSkip(&ptr, "$DISPLAY")) { |
| 498 | |
| 499 | sprintf(str, "%s:%d", rfbScreen->thisHost, rfbScreen->port-5900); |
| 500 | rfbWriteExact(&cl, str, strlen(str)); |
| 501 | |
| 502 | } else if (compareAndSkip(&ptr, "$USER")) { |
| 503 | #ifndef WIN32 |
| 504 | if (user) { |
| 505 | rfbWriteExact(&cl, user, |
| 506 | strlen(user)); |
| 507 | } else |
| 508 | #endif |
| 509 | rfbWriteExact(&cl, "?", 1); |
| 510 | } else if (compareAndSkip(&ptr, "$PARAMS")) { |
| 511 | if (params[0] != '\0') |
| 512 | rfbWriteExact(&cl, params, strlen(params)); |
| 513 | } else { |
| 514 | if (!compareAndSkip(&ptr, "$$")) |
| 515 | ptr++; |
| 516 | |
| 517 | if (rfbWriteExact(&cl, "$", 1) < 0) { |
| 518 | fclose(fd); |
| 519 | httpCloseSock(rfbScreen); |
| 520 | return; |
| 521 | } |
| 522 | } |
| 523 | } |
| 524 | if (rfbWriteExact(&cl, ptr, (&buf[n] - ptr)) < 0) |
| 525 | break; |
| 526 | |
| 527 | } else { |
| 528 | |
| 529 | /* For files not ending .vnc, just write out the buffer */ |
| 530 | |
| 531 | if (rfbWriteExact(&cl, buf, n) < 0) |
| 532 | break; |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | fclose(fd); |
| 537 | httpCloseSock(rfbScreen); |
| 538 | } |
| 539 | |
| 540 | |
| 541 | static rfbBool |
| 542 | compareAndSkip(char **ptr, const char *str) |
| 543 | { |
| 544 | if (strncmp(*ptr, str, strlen(str)) == 0) { |
| 545 | *ptr += strlen(str); |
| 546 | return TRUE; |
| 547 | } |
| 548 | |
| 549 | return FALSE; |
| 550 | } |
| 551 | |
| 552 | /* |
| 553 | * Parse the request tail after the '?' character, and format a sequence |
| 554 | * of <param> tags for inclusion into an HTML page with embedded applet. |
| 555 | */ |
| 556 | |
| 557 | static rfbBool |
| 558 | parseParams(const char *request, char *result, int max_bytes) |
| 559 | { |
| 560 | char param_request[128]; |
| 561 | char param_formatted[196]; |
| 562 | const char *tail; |
| 563 | char *delim_ptr; |
| 564 | char *value_str; |
| 565 | int cur_bytes, len; |
| 566 | |
| 567 | result[0] = '\0'; |
| 568 | cur_bytes = 0; |
| 569 | |
| 570 | tail = request; |
| 571 | for (;;) { |
| 572 | /* Copy individual "name=value" string into a buffer */ |
| 573 | delim_ptr = strchr((char *)tail, '&'); |
| 574 | if (delim_ptr == NULL) { |
| 575 | if (strlen(tail) >= sizeof(param_request)) { |
| 576 | return FALSE; |
| 577 | } |
| 578 | strcpy(param_request, tail); |
| 579 | } else { |
| 580 | len = delim_ptr - tail; |
| 581 | if (len >= sizeof(param_request)) { |
| 582 | return FALSE; |
| 583 | } |
| 584 | memcpy(param_request, tail, len); |
| 585 | param_request[len] = '\0'; |
| 586 | } |
| 587 | |
| 588 | /* Split the request into parameter name and value */ |
| 589 | value_str = strchr(¶m_request[1], '='); |
| 590 | if (value_str == NULL) { |
| 591 | return FALSE; |
| 592 | } |
| 593 | *value_str++ = '\0'; |
| 594 | if (strlen(value_str) == 0) { |
| 595 | return FALSE; |
| 596 | } |
| 597 | |
| 598 | /* Validate both parameter name and value */ |
| 599 | if (!validateString(param_request) || !validateString(value_str)) { |
| 600 | return FALSE; |
| 601 | } |
| 602 | |
| 603 | /* Prepare HTML-formatted representation of the name=value pair */ |
| 604 | len = sprintf(param_formatted, |
| 605 | "<PARAM NAME=\"%s\" VALUE=\"%s\">\n", |
| 606 | param_request, value_str); |
| 607 | if (cur_bytes + len + 1 > max_bytes) { |
| 608 | return FALSE; |
| 609 | } |
| 610 | strcat(result, param_formatted); |
| 611 | cur_bytes += len; |
| 612 | |
| 613 | /* Go to the next parameter */ |
| 614 | if (delim_ptr == NULL) { |
| 615 | break; |
| 616 | } |
| 617 | tail = delim_ptr + 1; |
| 618 | } |
| 619 | return TRUE; |
| 620 | } |
| 621 | |
| 622 | /* |
| 623 | * Check if the string consists only of alphanumeric characters, '+' |
| 624 | * signs, underscores, dots, colons and square brackets. |
| 625 | * Replace all '+' signs with spaces. |
| 626 | */ |
| 627 | |
| 628 | static rfbBool |
| 629 | validateString(char *str) |
| 630 | { |
| 631 | char *ptr; |
| 632 | |
| 633 | for (ptr = str; *ptr != '\0'; ptr++) { |
| 634 | if (!isalnum(*ptr) && *ptr != '_' && *ptr != '.' |
| 635 | && *ptr != ':' && *ptr != '[' && *ptr != ']' ) { |
| 636 | if (*ptr == '+') { |
| 637 | *ptr = ' '; |
| 638 | } else { |
| 639 | return FALSE; |
| 640 | } |
| 641 | } |
| 642 | } |
| 643 | return TRUE; |
| 644 | } |
| 645 | |