1 //===-- RNBSocket.cpp -------------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Created by Greg Clayton on 12/12/07. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "RNBSocket.h" 15 #include <arpa/inet.h> 16 #include <errno.h> 17 #include <fcntl.h> 18 #include <netdb.h> 19 #include <netinet/in.h> 20 #include <netinet/tcp.h> 21 #include <termios.h> 22 #include "DNBLog.h" 23 #include "DNBError.h" 24 25 #ifdef WITH_LOCKDOWN 26 #include "lockdown.h" 27 #endif 28 29 /* Once we have a RNBSocket object with a port # specified, 30 this function is called to wait for an incoming connection. 31 This function blocks while waiting for that connection. */ 32 33 bool 34 ResolveIPV4HostName (const char *hostname, in_addr_t &addr) 35 { 36 if (hostname == NULL || 37 hostname[0] == '\0' || 38 strcmp(hostname, "localhost") == 0 || 39 strcmp(hostname, "127.0.0.1") == 0) 40 { 41 addr = htonl (INADDR_LOOPBACK); 42 return true; 43 } 44 else if (strcmp(hostname, "*") == 0) 45 { 46 addr = htonl (INADDR_ANY); 47 return true; 48 } 49 else 50 { 51 // See if an IP address was specified as numbers 52 int inet_pton_result = ::inet_pton (AF_INET, hostname, &addr); 53 54 if (inet_pton_result == 1) 55 return true; 56 57 struct hostent *host_entry = gethostbyname (hostname); 58 if (host_entry) 59 { 60 std::string ip_str (::inet_ntoa (*(struct in_addr *)*host_entry->h_addr_list)); 61 inet_pton_result = ::inet_pton (AF_INET, ip_str.c_str(), &addr); 62 if (inet_pton_result == 1) 63 return true; 64 } 65 } 66 return false; 67 } 68 69 rnb_err_t 70 RNBSocket::Listen (const char *listen_host, in_port_t port, PortBoundCallback callback, const void *callback_baton) 71 { 72 //DNBLogThreadedIf(LOG_RNB_COMM, "%8u RNBSocket::%s called", (uint32_t)m_timer.ElapsedMicroSeconds(true), __FUNCTION__); 73 // Disconnect without saving errno 74 Disconnect (false); 75 76 // Now figure out the hostname that will be attaching and palce it into 77 struct sockaddr_in listen_addr; 78 ::memset (&listen_addr, 0, sizeof listen_addr); 79 listen_addr.sin_len = sizeof listen_addr; 80 listen_addr.sin_family = AF_INET; 81 listen_addr.sin_port = htons (port); 82 listen_addr.sin_addr.s_addr = INADDR_ANY; 83 84 if (!ResolveIPV4HostName(listen_host, listen_addr.sin_addr.s_addr)) 85 { 86 DNBLogThreaded("error: failed to resolve connecting host '%s'", listen_host); 87 return rnb_err; 88 } 89 90 DNBError err; 91 int listen_fd = ::socket (AF_INET, SOCK_STREAM, IPPROTO_TCP); 92 if (listen_fd == -1) 93 err.SetError(errno, DNBError::POSIX); 94 95 if (err.Fail() || DNBLogCheckLogBit(LOG_RNB_COMM)) 96 err.LogThreaded("::socket ( domain = AF_INET, type = SOCK_STREAM, protocol = IPPROTO_TCP ) => socket = %i", listen_fd); 97 98 if (err.Fail()) 99 return rnb_err; 100 101 // enable local address reuse 102 SetSocketOption (listen_fd, SOL_SOCKET, SO_REUSEADDR, 1); 103 104 struct sockaddr_in sa; 105 ::memset (&sa, 0, sizeof sa); 106 sa.sin_len = sizeof sa; 107 sa.sin_family = AF_INET; 108 sa.sin_port = htons (port); 109 sa.sin_addr.s_addr = INADDR_ANY; // Let incoming connections bind to any host network interface (this is NOT who can connect to us) 110 int error = ::bind (listen_fd, (struct sockaddr *) &sa, sizeof(sa)); 111 if (error == -1) 112 err.SetError(errno, DNBError::POSIX); 113 114 if (err.Fail() || DNBLogCheckLogBit(LOG_RNB_COMM)) 115 err.LogThreaded("::bind ( socket = %i, (struct sockaddr *) &sa, sizeof(sa)) )", listen_fd); 116 117 if (err.Fail()) 118 { 119 ClosePort (listen_fd, false); 120 return rnb_err; 121 } 122 123 if (callback && port == 0) 124 { 125 // We were asked to listen on port zero which means we 126 // must now read the actual port that was given to us 127 // as port zero is a special code for "find an open port 128 // for me". 129 socklen_t sa_len = sizeof (sa); 130 if (getsockname(listen_fd, (struct sockaddr *)&sa, &sa_len) == 0) 131 { 132 port = ntohs (sa.sin_port); 133 callback (callback_baton, port); 134 } 135 } 136 137 error = ::listen (listen_fd, 5); 138 if (error == -1) 139 err.SetError(errno, DNBError::POSIX); 140 141 if (err.Fail() || DNBLogCheckLogBit(LOG_RNB_COMM)) 142 err.LogThreaded("::listen ( socket = %i, backlog = 1 )", listen_fd); 143 144 if (err.Fail()) 145 { 146 ClosePort (listen_fd, false); 147 return rnb_err; 148 } 149 150 struct sockaddr_in accept_addr; 151 ::memset (&accept_addr, 0, sizeof accept_addr); 152 accept_addr.sin_len = sizeof accept_addr; 153 154 bool accept_connection = false; 155 156 // Loop until we are happy with our connection 157 while (!accept_connection) 158 { 159 socklen_t accept_addr_len = sizeof accept_addr; 160 m_fd = ::accept (listen_fd, (struct sockaddr *)&accept_addr, &accept_addr_len); 161 162 if (m_fd == -1) 163 err.SetError(errno, DNBError::POSIX); 164 165 if (err.Fail() || DNBLogCheckLogBit(LOG_RNB_COMM)) 166 err.LogThreaded("::accept ( socket = %i, address = %p, address_len = %u )", listen_fd, &accept_addr, accept_addr_len); 167 168 if (err.Fail()) 169 break; 170 171 if (listen_addr.sin_addr.s_addr == INADDR_ANY) 172 accept_connection = true; 173 else 174 { 175 if (accept_addr_len == listen_addr.sin_len && 176 accept_addr.sin_addr.s_addr == listen_addr.sin_addr.s_addr) 177 { 178 accept_connection = true; 179 } 180 else 181 { 182 ::close (m_fd); 183 m_fd = -1; 184 const uint8_t *accept_ip = (const uint8_t *)&accept_addr.sin_addr.s_addr; 185 const uint8_t *listen_ip = (const uint8_t *)&listen_addr.sin_addr.s_addr; 186 ::fprintf (stderr, 187 "error: rejecting incoming connection from %u.%u.%u.%u (expecting %u.%u.%u.%u)\n", 188 accept_ip[0], accept_ip[1], accept_ip[2], accept_ip[3], 189 listen_ip[0], listen_ip[1], listen_ip[2], listen_ip[3]); 190 DNBLogThreaded ("error: rejecting connection from %u.%u.%u.%u (expecting %u.%u.%u.%u)", 191 accept_ip[0], accept_ip[1], accept_ip[2], accept_ip[3], 192 listen_ip[0], listen_ip[1], listen_ip[2], listen_ip[3]); 193 } 194 } 195 } 196 197 ClosePort (listen_fd, false); 198 199 if (err.Fail()) 200 { 201 return rnb_err; 202 } 203 else 204 { 205 // Keep our TCP packets coming without any delays. 206 SetSocketOption (m_fd, IPPROTO_TCP, TCP_NODELAY, 1); 207 } 208 209 return rnb_success; 210 } 211 212 rnb_err_t 213 RNBSocket::Connect (const char *host, uint16_t port) 214 { 215 Disconnect (false); 216 217 // Create the socket 218 m_fd = ::socket (AF_INET, SOCK_STREAM, IPPROTO_TCP); 219 if (m_fd == -1) 220 return rnb_err; 221 222 // Enable local address reuse 223 SetSocketOption (m_fd, SOL_SOCKET, SO_REUSEADDR, 1); 224 225 struct sockaddr_in sa; 226 ::memset (&sa, 0, sizeof (sa)); 227 sa.sin_family = AF_INET; 228 sa.sin_port = htons (port); 229 230 if (!ResolveIPV4HostName(host, sa.sin_addr.s_addr)) 231 { 232 DNBLogThreaded("error: failed to resolve host '%s'", host); 233 Disconnect (false); 234 return rnb_err; 235 } 236 237 if (-1 == ::connect (m_fd, (const struct sockaddr *)&sa, sizeof(sa))) 238 { 239 Disconnect (false); 240 return rnb_err; 241 } 242 243 // Keep our TCP packets coming without any delays. 244 SetSocketOption (m_fd, IPPROTO_TCP, TCP_NODELAY, 1); 245 return rnb_success; 246 } 247 248 rnb_err_t 249 RNBSocket::useFD(int fd) 250 { 251 if (fd < 0) { 252 DNBLogThreadedIf(LOG_RNB_COMM, "Bad file descriptor passed in."); 253 return rnb_err; 254 } 255 256 m_fd = fd; 257 return rnb_success; 258 } 259 260 #ifdef WITH_LOCKDOWN 261 rnb_err_t 262 RNBSocket::ConnectToService() 263 { 264 DNBLog("Connecting to com.apple.%s service...", DEBUGSERVER_PROGRAM_NAME); 265 // Disconnect from any previous connections 266 Disconnect(false); 267 if (::secure_lockdown_checkin (&m_ld_conn, NULL, NULL) != kLDESuccess) 268 { 269 DNBLogThreadedIf(LOG_RNB_COMM, "::secure_lockdown_checkin(&m_fd, NULL, NULL) failed"); 270 m_fd = -1; 271 return rnb_not_connected; 272 } 273 m_fd = ::lockdown_get_socket (m_ld_conn); 274 if (m_fd == -1) 275 { 276 DNBLogThreadedIf(LOG_RNB_COMM, "::lockdown_get_socket() failed"); 277 return rnb_not_connected; 278 } 279 m_fd_from_lockdown = true; 280 return rnb_success; 281 } 282 #endif 283 284 rnb_err_t 285 RNBSocket::OpenFile (const char *path) 286 { 287 DNBError err; 288 m_fd = open (path, O_RDWR); 289 if (m_fd == -1) 290 { 291 err.SetError(errno, DNBError::POSIX); 292 err.LogThreaded ("can't open file '%s'", path); 293 return rnb_not_connected; 294 } 295 else 296 { 297 struct termios stdin_termios; 298 299 if (::tcgetattr (m_fd, &stdin_termios) == 0) 300 { 301 stdin_termios.c_lflag &= ~ECHO; // Turn off echoing 302 stdin_termios.c_lflag &= ~ICANON; // Get one char at a time 303 ::tcsetattr (m_fd, TCSANOW, &stdin_termios); 304 } 305 } 306 return rnb_success; 307 } 308 309 int 310 RNBSocket::SetSocketOption(int fd, int level, int option_name, int option_value) 311 { 312 return ::setsockopt(fd, level, option_name, &option_value, sizeof(option_value)); 313 } 314 315 rnb_err_t 316 RNBSocket::Disconnect (bool save_errno) 317 { 318 #ifdef WITH_LOCKDOWN 319 if (m_fd_from_lockdown) 320 { 321 m_fd_from_lockdown = false; 322 m_fd = -1; 323 lockdown_disconnect (m_ld_conn); 324 return rnb_success; 325 } 326 #endif 327 return ClosePort (m_fd, save_errno); 328 } 329 330 331 rnb_err_t 332 RNBSocket::Read (std::string &p) 333 { 334 char buf[1024]; 335 p.clear(); 336 337 // Note that BUF is on the stack so we must be careful to keep any 338 // writes to BUF from overflowing or we'll have security issues. 339 340 if (m_fd == -1) 341 return rnb_err; 342 343 //DNBLogThreadedIf(LOG_RNB_COMM, "%8u RNBSocket::%s calling read()", (uint32_t)m_timer.ElapsedMicroSeconds(true), __FUNCTION__); 344 DNBError err; 345 int bytesread = read (m_fd, buf, sizeof (buf)); 346 if (bytesread <= 0) 347 err.SetError(errno, DNBError::POSIX); 348 else 349 p.append(buf, bytesread); 350 351 if (err.Fail() || DNBLogCheckLogBit(LOG_RNB_COMM)) 352 err.LogThreaded("::read ( %i, %p, %llu ) => %i", m_fd, buf, sizeof (buf), (uint64_t)bytesread); 353 354 // Our port went away - we have to mark this so IsConnected will return the truth. 355 if (bytesread == 0) 356 { 357 m_fd = -1; 358 return rnb_not_connected; 359 } 360 else if (bytesread == -1) 361 { 362 m_fd = -1; 363 return rnb_err; 364 } 365 // Strip spaces from the end of the buffer 366 while (!p.empty() && isspace (p[p.size() - 1])) 367 p.erase (p.size () - 1); 368 369 // Most data in the debugserver packets valid printable characters... 370 DNBLogThreadedIf(LOG_RNB_COMM, "read: %s", p.c_str()); 371 return rnb_success; 372 } 373 374 rnb_err_t 375 RNBSocket::Write (const void *buffer, size_t length) 376 { 377 if (m_fd == -1) 378 return rnb_err; 379 380 DNBError err; 381 int bytessent = write (m_fd, buffer, length); 382 if (bytessent < 0) 383 err.SetError(errno, DNBError::POSIX); 384 385 if (err.Fail() || DNBLogCheckLogBit(LOG_RNB_COMM)) 386 err.LogThreaded("::write ( socket = %i, buffer = %p, length = %llu) => %i", m_fd, buffer, length, (uint64_t)bytessent); 387 388 if (bytessent < 0) 389 return rnb_err; 390 391 if (bytessent != length) 392 return rnb_err; 393 394 DNBLogThreadedIf(LOG_RNB_PACKETS, "putpkt: %*s", (int)length, (char *)buffer); // All data is string based in debugserver, so this is safe 395 DNBLogThreadedIf(LOG_RNB_COMM, "sent: %*s", (int)length, (char *)buffer); 396 397 return rnb_success; 398 } 399 400 401 rnb_err_t 402 RNBSocket::ClosePort (int& fd, bool save_errno) 403 { 404 int close_err = 0; 405 if (fd > 0) 406 { 407 errno = 0; 408 close_err = close (fd); 409 fd = -1; 410 } 411 return close_err != 0 ? rnb_err : rnb_success; 412 } 413 414 415
