The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame^] | 1 | /* Copyright (C) 2007-2008 The Android Open Source Project |
| 2 | ** |
| 3 | ** This software is licensed under the terms of the GNU General Public |
| 4 | ** License version 2, as published by the Free Software Foundation, and |
| 5 | ** may be copied, distributed, and modified under those terms. |
| 6 | ** |
| 7 | ** This program is distributed in the hope that it will be useful, |
| 8 | ** but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | ** GNU General Public License for more details. |
| 11 | */ |
| 12 | #include "proxy_int.h" |
| 13 | #include "sockets.h" |
| 14 | #include <stdarg.h> |
| 15 | #include <stdio.h> |
| 16 | #include <string.h> |
| 17 | #include <errno.h> |
| 18 | #include "android/utils/misc.h" |
| 19 | #include "android/utils/system.h" |
| 20 | #include <stdlib.h> |
| 21 | |
| 22 | int proxy_log = 0; |
| 23 | |
| 24 | void |
| 25 | proxy_LOG(const char* fmt, ...) |
| 26 | { |
| 27 | va_list args; |
| 28 | va_start(args, fmt); |
| 29 | vfprintf(stderr, fmt, args); |
| 30 | va_end(args); |
| 31 | fprintf(stderr, "\n"); |
| 32 | } |
| 33 | |
| 34 | void |
| 35 | proxy_set_verbose(int mode) |
| 36 | { |
| 37 | proxy_log = mode; |
| 38 | } |
| 39 | |
| 40 | /** Global connection list |
| 41 | **/ |
| 42 | |
| 43 | static ProxyConnection s_connections[1]; |
| 44 | |
| 45 | #define MAX_HEX_DUMP 512 |
| 46 | |
| 47 | static void |
| 48 | hex_dump( void* base, int size, const char* prefix ) |
| 49 | { |
| 50 | STRALLOC_DEFINE(s); |
| 51 | if (size > MAX_HEX_DUMP) |
| 52 | size = MAX_HEX_DUMP; |
| 53 | stralloc_add_hexdump(s, base, size, prefix); |
| 54 | proxy_LOG( "%s", stralloc_cstr(s) ); |
| 55 | stralloc_reset(s); |
| 56 | } |
| 57 | |
| 58 | void |
| 59 | proxy_connection_init( ProxyConnection* conn, |
| 60 | int socket, |
| 61 | SockAddress* address, |
| 62 | ProxyService* service, |
| 63 | ProxyConnectionFreeFunc conn_free, |
| 64 | ProxyConnectionSelectFunc conn_select, |
| 65 | ProxyConnectionPollFunc conn_poll ) |
| 66 | { |
| 67 | conn->socket = socket; |
| 68 | conn->address = address[0]; |
| 69 | conn->service = service; |
| 70 | conn->next = NULL; |
| 71 | |
| 72 | conn->conn_free = conn_free; |
| 73 | conn->conn_select = conn_select; |
| 74 | conn->conn_poll = conn_poll; |
| 75 | |
| 76 | socket_set_nonblock(socket); |
| 77 | |
| 78 | { |
| 79 | SocketType type = socket_get_type(socket); |
| 80 | |
| 81 | snprintf( conn->name, sizeof(conn->name), |
| 82 | "%s:%s(%d)", |
| 83 | (type == SOCKET_STREAM) ? "tcp" : "udp", |
| 84 | sock_address_to_string(address), socket ); |
| 85 | |
| 86 | /* just in case */ |
| 87 | conn->name[sizeof(conn->name)-1] = 0; |
| 88 | } |
| 89 | |
| 90 | stralloc_reset(conn->str); |
| 91 | conn->str_pos = 0; |
| 92 | } |
| 93 | |
| 94 | void |
| 95 | proxy_connection_done( ProxyConnection* conn ) |
| 96 | { |
| 97 | stralloc_reset( conn->str ); |
| 98 | if (conn->socket >= 0) { |
| 99 | socket_close(conn->socket); |
| 100 | conn->socket = -1; |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | |
| 105 | void |
| 106 | proxy_connection_rewind( ProxyConnection* conn ) |
| 107 | { |
| 108 | stralloc_t* str = conn->str; |
| 109 | |
| 110 | /* only keep a small buffer in the heap */ |
| 111 | conn->str_pos = 0; |
| 112 | str->n = 0; |
| 113 | if (str->a > 1024) |
| 114 | stralloc_reset(str); |
| 115 | } |
| 116 | |
| 117 | DataStatus |
| 118 | proxy_connection_send( ProxyConnection* conn, int fd ) |
| 119 | { |
| 120 | stralloc_t* str = conn->str; |
| 121 | int avail = str->n - conn->str_pos; |
| 122 | |
| 123 | conn->str_sent = 0; |
| 124 | |
| 125 | if (avail <= 0) |
| 126 | return 1; |
| 127 | |
| 128 | if (proxy_log) { |
| 129 | PROXY_LOG("%s: sending %d bytes:", conn->name, avail ); |
| 130 | hex_dump( str->s + conn->str_pos, avail, ">> " ); |
| 131 | } |
| 132 | |
| 133 | while (avail > 0) { |
| 134 | int n = socket_send(fd, str->s + conn->str_pos, avail); |
| 135 | if (n == 0) { |
| 136 | PROXY_LOG("%s: connection reset by peer (send)", |
| 137 | conn->name); |
| 138 | return DATA_ERROR; |
| 139 | } |
| 140 | if (n < 0) { |
| 141 | if (errno == EWOULDBLOCK || errno == EAGAIN) |
| 142 | return DATA_NEED_MORE; |
| 143 | |
| 144 | PROXY_LOG("%s: error: %s", conn->name, errno_str); |
| 145 | return DATA_ERROR; |
| 146 | } |
| 147 | conn->str_pos += n; |
| 148 | conn->str_sent += n; |
| 149 | avail -= n; |
| 150 | } |
| 151 | |
| 152 | proxy_connection_rewind(conn); |
| 153 | return DATA_COMPLETED; |
| 154 | } |
| 155 | |
| 156 | |
| 157 | DataStatus |
| 158 | proxy_connection_receive( ProxyConnection* conn, int fd, int wanted ) |
| 159 | { |
| 160 | stralloc_t* str = conn->str; |
| 161 | |
| 162 | conn->str_recv = 0; |
| 163 | |
| 164 | while (wanted > 0) { |
| 165 | int n; |
| 166 | |
| 167 | stralloc_readyplus( str, wanted ); |
| 168 | n = socket_recv(fd, str->s + str->n, wanted); |
| 169 | if (n == 0) { |
| 170 | PROXY_LOG("%s: connection reset by peer (receive)", |
| 171 | conn->name); |
| 172 | return DATA_ERROR; |
| 173 | } |
| 174 | if (n < 0) { |
| 175 | if (errno == EWOULDBLOCK || errno == EAGAIN) |
| 176 | return DATA_NEED_MORE; |
| 177 | |
| 178 | PROXY_LOG("%s: error: %s", conn->name, errno_str); |
| 179 | return DATA_ERROR; |
| 180 | } |
| 181 | |
| 182 | if (proxy_log) { |
| 183 | PROXY_LOG("%s: received %d bytes:", conn->name, n ); |
| 184 | hex_dump( str->s + str->n, n, "<< " ); |
| 185 | } |
| 186 | |
| 187 | str->n += n; |
| 188 | wanted -= n; |
| 189 | conn->str_recv += n; |
| 190 | } |
| 191 | return DATA_COMPLETED; |
| 192 | } |
| 193 | |
| 194 | |
| 195 | DataStatus |
| 196 | proxy_connection_receive_line( ProxyConnection* conn, int fd ) |
| 197 | { |
| 198 | stralloc_t* str = conn->str; |
| 199 | |
| 200 | for (;;) { |
| 201 | char c; |
| 202 | int n = socket_recv(fd, &c, 1); |
| 203 | if (n == 0) { |
| 204 | PROXY_LOG("%s: disconnected from server", conn->name ); |
| 205 | return DATA_ERROR; |
| 206 | } |
| 207 | if (n < 0) { |
| 208 | if (errno == EWOULDBLOCK || errno == EAGAIN) { |
| 209 | PROXY_LOG("%s: blocked", conn->name); |
| 210 | return DATA_NEED_MORE; |
| 211 | } |
| 212 | PROXY_LOG("%s: error: %s", conn->name, errno_str); |
| 213 | return DATA_ERROR; |
| 214 | } |
| 215 | |
| 216 | stralloc_add_c(str, c); |
| 217 | if (c == '\n') { |
| 218 | str->s[--str->n] = 0; |
| 219 | if (str->n > 0 && str->s[str->n-1] == '\r') |
| 220 | str->s[--str->n] = 0; |
| 221 | |
| 222 | PROXY_LOG("%s: received '%s'", conn->name, |
| 223 | quote_bytes(str->s, str->n)); |
| 224 | return DATA_COMPLETED; |
| 225 | } |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | static void |
| 230 | proxy_connection_insert( ProxyConnection* conn, ProxyConnection* after ) |
| 231 | { |
| 232 | conn->next = after->next; |
| 233 | after->next->prev = conn; |
| 234 | after->next = conn; |
| 235 | conn->prev = after; |
| 236 | } |
| 237 | |
| 238 | static void |
| 239 | proxy_connection_remove( ProxyConnection* conn ) |
| 240 | { |
| 241 | conn->prev->next = conn->next; |
| 242 | conn->next->prev = conn->prev; |
| 243 | |
| 244 | conn->next = conn->prev = conn; |
| 245 | } |
| 246 | |
| 247 | /** Global service list |
| 248 | **/ |
| 249 | |
| 250 | #define MAX_SERVICES 4 |
| 251 | |
| 252 | static ProxyService* s_services[ MAX_SERVICES ]; |
| 253 | static int s_num_services; |
| 254 | static int s_init; |
| 255 | |
| 256 | static void proxy_manager_atexit( void ); |
| 257 | |
| 258 | static void |
| 259 | proxy_manager_init(void) |
| 260 | { |
| 261 | s_init = 1; |
| 262 | s_connections->next = s_connections; |
| 263 | s_connections->prev = s_connections; |
| 264 | atexit( proxy_manager_atexit ); |
| 265 | } |
| 266 | |
| 267 | |
| 268 | extern int |
| 269 | proxy_manager_add_service( ProxyService* service ) |
| 270 | { |
| 271 | if (!service || s_num_services >= MAX_SERVICES) |
| 272 | return -1; |
| 273 | |
| 274 | if (!s_init) |
| 275 | proxy_manager_init(); |
| 276 | |
| 277 | s_services[s_num_services++] = service; |
| 278 | return 0; |
| 279 | } |
| 280 | |
| 281 | |
| 282 | extern void |
| 283 | proxy_manager_atexit( void ) |
| 284 | { |
| 285 | ProxyConnection* conn = s_connections->next; |
| 286 | int n; |
| 287 | |
| 288 | /* free all proxy connections */ |
| 289 | while (conn != s_connections) { |
| 290 | ProxyConnection* next = conn->next; |
| 291 | conn->conn_free( conn ); |
| 292 | conn = next; |
| 293 | } |
| 294 | conn->next = conn; |
| 295 | conn->prev = conn; |
| 296 | |
| 297 | /* free all proxy services */ |
| 298 | for (n = s_num_services; n-- > 0;) { |
| 299 | ProxyService* service = s_services[n]; |
| 300 | service->serv_free( service->opaque ); |
| 301 | } |
| 302 | s_num_services = 0; |
| 303 | } |
| 304 | |
| 305 | |
| 306 | void |
| 307 | proxy_connection_free( ProxyConnection* conn, |
| 308 | int keep_alive, |
| 309 | ProxyEvent event ) |
| 310 | { |
| 311 | if (conn) { |
| 312 | int fd = conn->socket; |
| 313 | |
| 314 | proxy_connection_remove(conn); |
| 315 | |
| 316 | if (event != PROXY_EVENT_NONE) |
| 317 | conn->ev_func( conn->ev_opaque, fd, event ); |
| 318 | |
| 319 | if (keep_alive) |
| 320 | conn->socket = -1; |
| 321 | |
| 322 | conn->conn_free(conn); |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | |
| 327 | int |
| 328 | proxy_manager_add( SockAddress* address, |
| 329 | SocketType sock_type, |
| 330 | ProxyEventFunc ev_func, |
| 331 | void* ev_opaque ) |
| 332 | { |
| 333 | int n; |
| 334 | |
| 335 | if (!s_init) { |
| 336 | proxy_manager_init(); |
| 337 | } |
| 338 | |
| 339 | for (n = 0; n < s_num_services; n++) { |
| 340 | ProxyService* service = s_services[n]; |
| 341 | ProxyConnection* conn = service->serv_connect( service->opaque, |
| 342 | sock_type, |
| 343 | address ); |
| 344 | if (conn != NULL) { |
| 345 | conn->ev_func = ev_func; |
| 346 | conn->ev_opaque = ev_opaque; |
| 347 | proxy_connection_insert(conn, s_connections->prev); |
| 348 | return 0; |
| 349 | } |
| 350 | } |
| 351 | return -1; |
| 352 | } |
| 353 | |
| 354 | |
| 355 | /* remove an on-going proxified socket connection from the manager's list. |
| 356 | * this is only necessary when the socket connection must be canceled before |
| 357 | * the connection accept/refusal occured |
| 358 | */ |
| 359 | void |
| 360 | proxy_manager_del( void* ev_opaque ) |
| 361 | { |
| 362 | ProxyConnection* conn = s_connections->next; |
| 363 | for ( ; conn != s_connections; conn = conn->next ) { |
| 364 | if (conn->ev_opaque == ev_opaque) { |
| 365 | proxy_connection_remove(conn); |
| 366 | conn->conn_free(conn); |
| 367 | return; |
| 368 | } |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | void |
| 373 | proxy_select_set( ProxySelect* sel, |
| 374 | int fd, |
| 375 | unsigned flags ) |
| 376 | { |
| 377 | if (fd < 0 || !flags) |
| 378 | return; |
| 379 | |
| 380 | if (*sel->pcount < fd+1) |
| 381 | *sel->pcount = fd+1; |
| 382 | |
| 383 | if (flags & PROXY_SELECT_READ) { |
| 384 | FD_SET( fd, sel->reads ); |
| 385 | } else { |
| 386 | FD_CLR( fd, sel->reads ); |
| 387 | } |
| 388 | if (flags & PROXY_SELECT_WRITE) { |
| 389 | FD_SET( fd, sel->writes ); |
| 390 | } else { |
| 391 | FD_CLR( fd, sel->writes ); |
| 392 | } |
| 393 | if (flags & PROXY_SELECT_ERROR) { |
| 394 | FD_SET( fd, sel->errors ); |
| 395 | } else { |
| 396 | FD_CLR( fd, sel->errors ); |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | unsigned |
| 401 | proxy_select_poll( ProxySelect* sel, int fd ) |
| 402 | { |
| 403 | unsigned flags = 0; |
| 404 | |
| 405 | if (fd >= 0) { |
| 406 | if ( FD_ISSET(fd, sel->reads) ) |
| 407 | flags |= PROXY_SELECT_READ; |
| 408 | if ( FD_ISSET(fd, sel->writes) ) |
| 409 | flags |= PROXY_SELECT_WRITE; |
| 410 | if ( FD_ISSET(fd, sel->errors) ) |
| 411 | flags |= PROXY_SELECT_ERROR; |
| 412 | } |
| 413 | return flags; |
| 414 | } |
| 415 | |
| 416 | /* this function is called to update the select file descriptor sets |
| 417 | * with those of the proxified connection sockets that are currently managed */ |
| 418 | void |
| 419 | proxy_manager_select_fill( int *pcount, fd_set* read_fds, fd_set* write_fds, fd_set* err_fds) |
| 420 | { |
| 421 | ProxyConnection* conn; |
| 422 | ProxySelect sel[1]; |
| 423 | |
| 424 | if (!s_init) |
| 425 | proxy_manager_init(); |
| 426 | |
| 427 | sel->pcount = pcount; |
| 428 | sel->reads = read_fds; |
| 429 | sel->writes = write_fds; |
| 430 | sel->errors = err_fds; |
| 431 | |
| 432 | conn = s_connections->next; |
| 433 | while (conn != s_connections) { |
| 434 | ProxyConnection* next = conn->next; |
| 435 | conn->conn_select(conn, sel); |
| 436 | conn = next; |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | /* this function is called to act on proxified connection sockets when network events arrive */ |
| 441 | void |
| 442 | proxy_manager_poll( fd_set* read_fds, fd_set* write_fds, fd_set* err_fds ) |
| 443 | { |
| 444 | ProxyConnection* conn = s_connections->next; |
| 445 | ProxySelect sel[1]; |
| 446 | |
| 447 | sel->pcount = NULL; |
| 448 | sel->reads = read_fds; |
| 449 | sel->writes = write_fds; |
| 450 | sel->errors = err_fds; |
| 451 | |
| 452 | while (conn != s_connections) { |
| 453 | ProxyConnection* next = conn->next; |
| 454 | conn->conn_poll( conn, sel ); |
| 455 | conn = next; |
| 456 | } |
| 457 | } |
| 458 | |
| 459 | |
| 460 | int |
| 461 | proxy_base64_encode( const char* src, int srclen, |
| 462 | char* dst, int dstlen ) |
| 463 | { |
| 464 | static const char cb64[64]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
| 465 | const char* srcend = src + srclen; |
| 466 | int result = 0; |
| 467 | |
| 468 | while (src+3 <= srcend && result+4 <= dstlen) |
| 469 | { |
| 470 | dst[result+0] = cb64[ src[0] >> 2 ]; |
| 471 | dst[result+1] = cb64[ ((src[0] & 3) << 4) | ((src[1] & 0xf0) >> 4) ]; |
| 472 | dst[result+2] = cb64[ ((src[1] & 0xf) << 2) | ((src[2] & 0xc0) >> 6) ]; |
| 473 | dst[result+3] = cb64[ src[2] & 0x3f ]; |
| 474 | src += 3; |
| 475 | result += 4; |
| 476 | } |
| 477 | |
| 478 | if (src < srcend) { |
| 479 | unsigned char in[4]; |
| 480 | |
| 481 | if (result+4 > dstlen) |
| 482 | return -1; |
| 483 | |
| 484 | in[0] = src[0]; |
| 485 | in[1] = src+1 < srcend ? src[1] : 0; |
| 486 | in[2] = src+2 < srcend ? src[2] : 0; |
| 487 | |
| 488 | dst[result+0] = cb64[ in[0] >> 2 ]; |
| 489 | dst[result+1] = cb64[ ((in[0] & 3) << 4) | ((in[1] & 0xf0) >> 4) ]; |
| 490 | dst[result+2] = (unsigned char) (src+1 < srcend ? cb64[ ((in[1] & 0xf) << 2) | ((in[2] & 0xc0) >> 6) ] : '='); |
| 491 | dst[result+3] = (unsigned char) (src+2 < srcend ? cb64[ in[2] & 0x3f ] : '='); |
| 492 | result += 4; |
| 493 | } |
| 494 | return result; |
| 495 | } |
| 496 | |
| 497 | int |
| 498 | proxy_resolve_server( SockAddress* addr, |
| 499 | const char* servername, |
| 500 | int servernamelen, |
| 501 | int serverport ) |
| 502 | { |
| 503 | char name0[64], *name = name0; |
| 504 | int result = -1; |
| 505 | |
| 506 | if (servernamelen < 0) |
| 507 | servernamelen = strlen(servername); |
| 508 | |
| 509 | if (servernamelen >= sizeof(name0)) { |
| 510 | AARRAY_NEW(name, servernamelen+1); |
| 511 | } |
| 512 | |
| 513 | memcpy(name, servername, servernamelen); |
| 514 | name[servernamelen] = 0; |
| 515 | |
| 516 | if (sock_address_init_resolve( addr, name, serverport, 0 ) < 0) { |
| 517 | PROXY_LOG("%s: can't resolve proxy server name '%s'", |
| 518 | __FUNCTION__, name); |
| 519 | goto Exit; |
| 520 | } |
| 521 | |
| 522 | PROXY_LOG("server name '%s' resolved to %s", name, sock_address_to_string(addr)); |
| 523 | result = 0; |
| 524 | |
| 525 | Exit: |
| 526 | if (name != name0) |
| 527 | AFREE(name); |
| 528 | |
| 529 | return result; |
| 530 | } |
| 531 | |
| 532 | |