| File: | src/usr.bin/telnet/sys_bsd.c |
| Warning: | line 529, column 10 Although the value stored to 'c' is used in the enclosing expression, the value is never actually read from 'c' |
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| 1 | /* $OpenBSD: sys_bsd.c,v 1.35 2019/06/28 13:35:04 deraadt Exp $ */ |
| 2 | /* $NetBSD: sys_bsd.c,v 1.11 1996/02/28 21:04:10 thorpej Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 1988, 1990, 1993 |
| 6 | * The Regents of the University of California. All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the name of the University nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software |
| 18 | * without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 30 | * SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | #include "telnet_locl.h" |
| 34 | |
| 35 | #include <sys/ioctl.h> |
| 36 | #include <sys/socket.h> |
| 37 | #include <arpa/telnet.h> |
| 38 | #include <errno(*__errno()).h> |
| 39 | #include <poll.h> |
| 40 | #include <string.h> |
| 41 | #include <unistd.h> |
| 42 | |
| 43 | /* |
| 44 | * The following routines try to encapsulate what is system dependent |
| 45 | * (at least between 4.x and dos) which is used in telnet.c. |
| 46 | */ |
| 47 | |
| 48 | int |
| 49 | tout, /* Output file descriptor */ |
| 50 | tin, /* Input file descriptor */ |
| 51 | net; |
| 52 | |
| 53 | #define TELNET_FD_TOUT0 0 |
| 54 | #define TELNET_FD_TIN1 1 |
| 55 | #define TELNET_FD_NET2 2 |
| 56 | #define TELNET_FD_NUM3 3 |
| 57 | |
| 58 | struct termios old_tc = { 0 }; |
| 59 | |
| 60 | void |
| 61 | init_sys(void) |
| 62 | { |
| 63 | tout = fileno(stdout)(!__isthreaded ? (((&__sF[1]))->_file) : (fileno)((& __sF[1]))); |
| 64 | tin = fileno(stdin)(!__isthreaded ? (((&__sF[0]))->_file) : (fileno)((& __sF[0]))); |
| 65 | |
| 66 | errno(*__errno()) = 0; |
| 67 | } |
| 68 | |
| 69 | |
| 70 | /* |
| 71 | * TerminalSpecialChars() |
| 72 | * |
| 73 | * Look at an input character to see if it is a special character |
| 74 | * and decide what to do. |
| 75 | * |
| 76 | * Output: |
| 77 | * |
| 78 | * 0 Don't add this character. |
| 79 | * 1 Do add this character |
| 80 | */ |
| 81 | |
| 82 | int |
| 83 | TerminalSpecialChars(int c) |
| 84 | { |
| 85 | if (c == termIntCharnew_tc.c_cc[8]) { |
| 86 | intp(); |
| 87 | return 0; |
| 88 | } else if (c == termQuitCharnew_tc.c_cc[9]) { |
| 89 | #ifdef KLUDGELINEMODE1 |
| 90 | if (kludgelinemode) |
| 91 | sendbrk(); |
| 92 | else |
| 93 | #endif |
| 94 | sendabort(); |
| 95 | return 0; |
| 96 | } else if (c == termEofCharnew_tc.c_cc[0]) { |
| 97 | if (my_want_state_is_will(TELOPT_LINEMODE)(options[34]&0x02)) { |
| 98 | sendeof(); |
| 99 | return 0; |
| 100 | } |
| 101 | return 1; |
| 102 | } else if (c == termSuspCharnew_tc.c_cc[10]) { |
| 103 | sendsusp(); |
| 104 | return(0); |
| 105 | } else if (c == termFlushCharnew_tc.c_cc[15]) { |
| 106 | xmitAO(); /* Transmit Abort Output */ |
| 107 | return 0; |
| 108 | } else if (!MODE_LOCAL_CHARS(globalmode)((globalmode)&(0x01|0x02))) { |
| 109 | if (c == termKillCharnew_tc.c_cc[5]) { |
| 110 | xmitEL(); |
| 111 | return 0; |
| 112 | } else if (c == termEraseCharnew_tc.c_cc[3]) { |
| 113 | xmitEC(); /* Transmit Erase Character */ |
| 114 | return 0; |
| 115 | } |
| 116 | } |
| 117 | return 1; |
| 118 | } |
| 119 | |
| 120 | void |
| 121 | TerminalSaveState(void) |
| 122 | { |
| 123 | tcgetattr(0, &old_tc); |
| 124 | |
| 125 | new_tc = old_tc; |
| 126 | } |
| 127 | |
| 128 | cc_t * |
| 129 | tcval(int func) |
| 130 | { |
| 131 | switch(func) { |
| 132 | case SLC_IP3: return(&termIntCharnew_tc.c_cc[8]); |
| 133 | case SLC_ABORT7: return(&termQuitCharnew_tc.c_cc[9]); |
| 134 | case SLC_EOF8: return(&termEofCharnew_tc.c_cc[0]); |
| 135 | case SLC_EC10: return(&termEraseCharnew_tc.c_cc[3]); |
| 136 | case SLC_EL11: return(&termKillCharnew_tc.c_cc[5]); |
| 137 | case SLC_XON15: return(&termStartCharnew_tc.c_cc[12]); |
| 138 | case SLC_XOFF16: return(&termStopCharnew_tc.c_cc[13]); |
| 139 | case SLC_FORW117: return(&termForw1Charnew_tc.c_cc[1]); |
| 140 | case SLC_FORW218: return(&termForw2Charnew_tc.c_cc[1]); |
| 141 | case SLC_SUSP9: return(&termSuspCharnew_tc.c_cc[10]); |
| 142 | case SLC_AO4: return(&termFlushCharnew_tc.c_cc[15]); |
| 143 | case SLC_EW12: return(&termWerasCharnew_tc.c_cc[4]); |
| 144 | case SLC_RP13: return(&termRprntCharnew_tc.c_cc[6]); |
| 145 | case SLC_LNEXT14: return(&termLiteralNextCharnew_tc.c_cc[14]); |
| 146 | case SLC_AYT5: return(&termAytCharnew_tc.c_cc[18]); |
| 147 | case SLC_SYNCH1: |
| 148 | case SLC_BRK2: |
| 149 | case SLC_EOR6: |
| 150 | default: |
| 151 | return(NULL((void *)0)); |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | void |
| 156 | TerminalDefaultChars(void) |
| 157 | { |
| 158 | memcpy(new_tc.c_cc, old_tc.c_cc, sizeof(old_tc.c_cc)); |
| 159 | } |
| 160 | |
| 161 | /* |
| 162 | * TerminalNewMode - set up terminal to a specific mode. |
| 163 | * MODE_ECHO: do local terminal echo |
| 164 | * MODE_FLOW: do local flow control |
| 165 | * MODE_TRAPSIG: do local mapping to TELNET IAC sequences |
| 166 | * MODE_EDIT: do local line editing |
| 167 | * |
| 168 | * Command mode: |
| 169 | * MODE_ECHO|MODE_EDIT|MODE_FLOW|MODE_TRAPSIG |
| 170 | * local echo |
| 171 | * local editing |
| 172 | * local xon/xoff |
| 173 | * local signal mapping |
| 174 | * |
| 175 | * Linemode: |
| 176 | * local/no editing |
| 177 | * Both Linemode and Single Character mode: |
| 178 | * local/remote echo |
| 179 | * local/no xon/xoff |
| 180 | * local/no signal mapping |
| 181 | */ |
| 182 | |
| 183 | static void susp(); |
| 184 | static void ayt(); |
| 185 | |
| 186 | void |
| 187 | TerminalNewMode(int f) |
| 188 | { |
| 189 | static int prevmode = 0; |
| 190 | struct termios tmp_tc; |
| 191 | int onoff; |
| 192 | int old; |
| 193 | cc_t esc; |
| 194 | |
| 195 | globalmode = f&~MODE_FORCE0x1000; |
| 196 | if (prevmode == f) |
| 197 | return; |
| 198 | |
| 199 | /* |
| 200 | * Write any outstanding data before switching modes |
| 201 | * ttyflush() returns 0 only when there is no more data |
| 202 | * left to write out, it returns -1 if it couldn't do |
| 203 | * anything at all, otherwise it returns 1 + the number |
| 204 | * of characters left to write. |
| 205 | */ |
| 206 | old = ttyflush(SYNCHing|flushout); |
| 207 | if (old < 0 || old > 1) { |
| 208 | tcgetattr(tin, &tmp_tc); |
| 209 | do { |
| 210 | /* |
| 211 | * Wait for data to drain, then flush again. |
| 212 | */ |
| 213 | if (isatty(tin)) |
| 214 | tcsetattr(tin, TCSADRAIN1, &tmp_tc); |
| 215 | old = ttyflush(SYNCHing|flushout); |
| 216 | } while (old < 0 || old > 1); |
| 217 | } |
| 218 | |
| 219 | old = prevmode; |
| 220 | prevmode = f&~MODE_FORCE0x1000; |
| 221 | tmp_tc = new_tc; |
| 222 | |
| 223 | if (f&MODE_ECHO0x0200) { |
| 224 | tmp_tc.c_lflag |= ECHO0x00000008; |
| 225 | tmp_tc.c_oflag |= ONLCR0x00000002; |
| 226 | if (crlf) |
| 227 | tmp_tc.c_iflag |= ICRNL0x00000100; |
| 228 | } else { |
| 229 | tmp_tc.c_lflag &= ~ECHO0x00000008; |
| 230 | tmp_tc.c_oflag &= ~ONLCR0x00000002; |
| 231 | } |
| 232 | |
| 233 | if ((f&MODE_FLOW0x0100) == 0) { |
| 234 | tmp_tc.c_iflag &= ~(IXOFF0x00000400|IXON0x00000200); /* Leave the IXANY bit alone */ |
| 235 | } else { |
| 236 | if (restartany < 0) { |
| 237 | tmp_tc.c_iflag |= IXOFF0x00000400|IXON0x00000200; /* Leave the IXANY bit alone */ |
| 238 | } else if (restartany > 0) { |
| 239 | tmp_tc.c_iflag |= IXOFF0x00000400|IXON0x00000200|IXANY0x00000800; |
| 240 | } else { |
| 241 | tmp_tc.c_iflag |= IXOFF0x00000400|IXON0x00000200; |
| 242 | tmp_tc.c_iflag &= ~IXANY0x00000800; |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | if ((f&MODE_TRAPSIG0x02) == 0) { |
| 247 | tmp_tc.c_lflag &= ~ISIG0x00000080; |
| 248 | localchars = 0; |
| 249 | } else { |
| 250 | tmp_tc.c_lflag |= ISIG0x00000080; |
| 251 | localchars = 1; |
| 252 | } |
| 253 | |
| 254 | if (f&MODE_EDIT0x01) { |
| 255 | tmp_tc.c_lflag |= ICANON0x00000100; |
| 256 | } else { |
| 257 | tmp_tc.c_lflag &= ~ICANON0x00000100; |
| 258 | tmp_tc.c_iflag &= ~ICRNL0x00000100; |
| 259 | tmp_tc.c_cc[VMIN16] = 1; |
| 260 | tmp_tc.c_cc[VTIME17] = 0; |
| 261 | } |
| 262 | |
| 263 | if ((f&(MODE_EDIT0x01|MODE_TRAPSIG0x02)) == 0) { |
| 264 | tmp_tc.c_lflag &= ~IEXTEN0x00000400; |
| 265 | } |
| 266 | |
| 267 | if (f&MODE_SOFT_TAB0x08) { |
| 268 | # ifdef OXTABS0x00000004 |
| 269 | tmp_tc.c_oflag |= OXTABS0x00000004; |
| 270 | # endif |
| 271 | # ifdef TABDLY |
| 272 | tmp_tc.c_oflag &= ~TABDLY; |
| 273 | tmp_tc.c_oflag |= TAB3; |
| 274 | # endif |
| 275 | } else { |
| 276 | # ifdef OXTABS0x00000004 |
| 277 | tmp_tc.c_oflag &= ~OXTABS0x00000004; |
| 278 | # endif |
| 279 | # ifdef TABDLY |
| 280 | tmp_tc.c_oflag &= ~TABDLY; |
| 281 | # endif |
| 282 | } |
| 283 | |
| 284 | if (f&MODE_LIT_ECHO0x10) { |
| 285 | # ifdef ECHOCTL0x00000040 |
| 286 | tmp_tc.c_lflag &= ~ECHOCTL0x00000040; |
| 287 | # endif |
| 288 | } else { |
| 289 | # ifdef ECHOCTL0x00000040 |
| 290 | tmp_tc.c_lflag |= ECHOCTL0x00000040; |
| 291 | # endif |
| 292 | } |
| 293 | |
| 294 | if (f == -1) { |
| 295 | onoff = 0; |
| 296 | } else { |
| 297 | if (f & MODE_INBIN0x0400) |
| 298 | tmp_tc.c_iflag &= ~ISTRIP0x00000020; |
| 299 | else |
| 300 | tmp_tc.c_iflag |= ISTRIP0x00000020; |
| 301 | if ((f & MODE_OUTBIN0x0800) || (f & MODE_OUT80x8000)) { |
| 302 | tmp_tc.c_cflag &= ~(CSIZE0x00000300|PARENB0x00001000); |
| 303 | tmp_tc.c_cflag |= CS80x00000300; |
| 304 | if(f & MODE_OUTBIN0x0800) |
| 305 | tmp_tc.c_oflag &= ~OPOST0x00000001; |
| 306 | else |
| 307 | tmp_tc.c_oflag |= OPOST0x00000001; |
| 308 | |
| 309 | } else { |
| 310 | tmp_tc.c_cflag &= ~(CSIZE0x00000300|PARENB0x00001000); |
| 311 | tmp_tc.c_cflag |= old_tc.c_cflag & (CSIZE0x00000300|PARENB0x00001000); |
| 312 | tmp_tc.c_oflag |= OPOST0x00000001; |
| 313 | } |
| 314 | onoff = 1; |
| 315 | } |
| 316 | |
| 317 | if (f != -1) { |
| 318 | (void) signal(SIGTSTP18, susp); |
| 319 | (void) signal(SIGINFO29, ayt); |
| 320 | #if defined(NOKERNINFO0x02000000) |
| 321 | tmp_tc.c_lflag |= NOKERNINFO0x02000000; |
| 322 | #endif |
| 323 | /* |
| 324 | * We don't want to process ^Y here. It's just another |
| 325 | * character that we'll pass on to the back end. It has |
| 326 | * to process it because it will be processed when the |
| 327 | * user attempts to read it, not when we send it. |
| 328 | */ |
| 329 | # ifdef VDSUSP11 |
| 330 | tmp_tc.c_cc[VDSUSP11] = (cc_t)(_POSIX_VDISABLE(0377)); |
| 331 | # endif |
| 332 | /* |
| 333 | * If the VEOL character is already set, then use VEOL2, |
| 334 | * otherwise use VEOL. |
| 335 | */ |
| 336 | esc = (rlogin != _POSIX_VDISABLE(0377)) ? rlogin : escape; |
| 337 | if ((tmp_tc.c_cc[VEOL1] != esc) |
| 338 | # ifdef VEOL22 |
| 339 | && (tmp_tc.c_cc[VEOL22] != esc) |
| 340 | # endif |
| 341 | ) { |
| 342 | if (tmp_tc.c_cc[VEOL1] == (cc_t)(_POSIX_VDISABLE(0377))) |
| 343 | tmp_tc.c_cc[VEOL1] = esc; |
| 344 | # ifdef VEOL22 |
| 345 | else if (tmp_tc.c_cc[VEOL22] == (cc_t)(_POSIX_VDISABLE(0377))) |
| 346 | tmp_tc.c_cc[VEOL22] = esc; |
| 347 | # endif |
| 348 | } |
| 349 | } else { |
| 350 | sigset_t mask; |
| 351 | (void) signal(SIGINFO29, ayt_status); |
| 352 | (void) signal(SIGTSTP18, SIG_DFL(void (*)(int))0); |
| 353 | sigemptyset(&mask); |
| 354 | sigaddset(&mask, SIGTSTP18); |
| 355 | sigprocmask(SIG_UNBLOCK2, &mask, NULL((void *)0)); |
| 356 | tmp_tc = old_tc; |
| 357 | } |
| 358 | if (isatty(tin) && tcsetattr(tin, TCSADRAIN1, &tmp_tc) == -1) |
| 359 | tcsetattr(tin, TCSANOW0, &tmp_tc); |
| 360 | |
| 361 | ioctl(tin, FIONBIO((unsigned long)0x80000000 | ((sizeof(int) & 0x1fff) << 16) | ((('f')) << 8) | ((126))), &onoff); |
| 362 | ioctl(tout, FIONBIO((unsigned long)0x80000000 | ((sizeof(int) & 0x1fff) << 16) | ((('f')) << 8) | ((126))), &onoff); |
| 363 | } |
| 364 | |
| 365 | void |
| 366 | TerminalSpeeds(long *ispeed, long *ospeed) |
| 367 | { |
| 368 | long in, out; |
| 369 | |
| 370 | out = cfgetospeed(&old_tc); |
| 371 | in = cfgetispeed(&old_tc); |
| 372 | if (in == 0) |
| 373 | in = out; |
| 374 | |
| 375 | *ispeed = in; |
| 376 | *ospeed = out; |
| 377 | } |
| 378 | |
| 379 | int |
| 380 | TerminalWindowSize(long *rows, long *cols) |
| 381 | { |
| 382 | struct winsize ws; |
| 383 | |
| 384 | if (ioctl(fileno(stdin)(!__isthreaded ? (((&__sF[0]))->_file) : (fileno)((& __sF[0]))), TIOCGWINSZ((unsigned long)0x40000000 | ((sizeof(struct winsize) & 0x1fff ) << 16) | ((('t')) << 8) | ((104))), &ws) == 0) { |
| 385 | *rows = ws.ws_row; |
| 386 | *cols = ws.ws_col; |
| 387 | return 1; |
| 388 | } |
| 389 | return 0; |
| 390 | } |
| 391 | |
| 392 | /* |
| 393 | * Various signal handling routines. |
| 394 | */ |
| 395 | |
| 396 | void |
| 397 | deadpeer(int sig) |
| 398 | { |
| 399 | setcommandmode(); |
| 400 | longjmp(peerdied, -1); |
| 401 | } |
| 402 | |
| 403 | void |
| 404 | intr(int sig) |
| 405 | { |
| 406 | if (localchars) { |
| 407 | intp(); |
| 408 | return; |
| 409 | } |
| 410 | setcommandmode(); |
| 411 | longjmp(toplevel, -1); |
| 412 | } |
| 413 | |
| 414 | void |
| 415 | intr2(int sig) |
| 416 | { |
| 417 | if (localchars) { |
| 418 | #ifdef KLUDGELINEMODE1 |
| 419 | if (kludgelinemode) |
| 420 | sendbrk(); |
| 421 | else |
| 422 | #endif |
| 423 | sendabort(); |
| 424 | return; |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | void |
| 429 | susp(int sig) |
| 430 | { |
| 431 | if ((rlogin != _POSIX_VDISABLE(0377)) && rlogin_susp()) |
| 432 | return; |
| 433 | if (localchars) |
| 434 | sendsusp(); |
| 435 | } |
| 436 | |
| 437 | void |
| 438 | sendwin(int sig) |
| 439 | { |
| 440 | if (connected) { |
| 441 | sendnaws(); |
| 442 | } |
| 443 | } |
| 444 | |
| 445 | void |
| 446 | ayt(int sig) |
| 447 | { |
| 448 | if (connected) |
| 449 | sendayt(); |
| 450 | else |
| 451 | ayt_status(sig); |
| 452 | } |
| 453 | |
| 454 | |
| 455 | void |
| 456 | sys_telnet_init(void) |
| 457 | { |
| 458 | int one = 1; |
| 459 | |
| 460 | (void) signal(SIGINT2, intr); |
| 461 | (void) signal(SIGQUIT3, intr2); |
| 462 | (void) signal(SIGPIPE13, deadpeer); |
| 463 | (void) signal(SIGWINCH28, sendwin); |
| 464 | (void) signal(SIGTSTP18, susp); |
| 465 | (void) signal(SIGINFO29, ayt); |
| 466 | |
| 467 | setconnmode(0); |
| 468 | |
| 469 | /* |
| 470 | * Mark the socket as non-blocking and receive urgent data inline. |
| 471 | * (The latter is required for correct telnet operation when a |
| 472 | * second urgent is sent before telnet can process the first.) |
| 473 | */ |
| 474 | ioctl(net, FIONBIO((unsigned long)0x80000000 | ((sizeof(int) & 0x1fff) << 16) | ((('f')) << 8) | ((126))), &one); |
| 475 | if (setsockopt(net, SOL_SOCKET0xffff, SO_OOBINLINE0x0100, &one, sizeof(one)) == -1) { |
| 476 | perror("setsockopt"); |
| 477 | } |
| 478 | } |
| 479 | |
| 480 | /* |
| 481 | * Process rings - |
| 482 | * |
| 483 | * This routine tries to fill up/empty our various rings. |
| 484 | * |
| 485 | * The parameter specifies whether this is a poll operation, |
| 486 | * or a block-until-something-happens operation. |
| 487 | * |
| 488 | * The return value is 1 if something happened, 0 if not. |
| 489 | */ |
| 490 | |
| 491 | int |
| 492 | process_rings(int netin, int netout, int netex, int ttyin, int ttyout, |
| 493 | int dopoll) /* If 0, then block until something to do */ |
| 494 | { |
| 495 | int c; |
| 496 | /* One wants to be a bit careful about setting returnValue |
| 497 | * to one, since a one implies we did some useful work, |
| 498 | * and therefore probably won't be called to block next |
| 499 | * time (TN3270 mode only). |
| 500 | */ |
| 501 | int returnValue = 0; |
| 502 | struct pollfd pfd[TELNET_FD_NUM3]; |
| 503 | |
| 504 | if (ttyout) { |
| 505 | pfd[TELNET_FD_TOUT0].fd = tout; |
| 506 | pfd[TELNET_FD_TOUT0].events = POLLOUT0x0004; |
| 507 | } else { |
| 508 | pfd[TELNET_FD_TOUT0].fd = -1; |
| 509 | } |
| 510 | if (ttyin) { |
| 511 | pfd[TELNET_FD_TIN1].fd = tin; |
| 512 | pfd[TELNET_FD_TIN1].events = POLLIN0x0001; |
| 513 | } else { |
| 514 | pfd[TELNET_FD_TIN1].fd = -1; |
| 515 | } |
| 516 | if (netout || netin || netex) { |
| 517 | pfd[TELNET_FD_NET2].fd = net; |
| 518 | pfd[TELNET_FD_NET2].events = 0; |
| 519 | if (netout) |
| 520 | pfd[TELNET_FD_NET2].events |= POLLOUT0x0004; |
| 521 | if (netin) |
| 522 | pfd[TELNET_FD_NET2].events |= POLLIN0x0001; |
| 523 | if (netex) |
| 524 | pfd[TELNET_FD_NET2].events |= POLLRDBAND0x0080; |
| 525 | } else { |
| 526 | pfd[TELNET_FD_NET2].fd = -1; |
| 527 | } |
| 528 | |
| 529 | if ((c = poll(pfd, TELNET_FD_NUM3, dopoll ? 0 : INFTIM(-1))) == -1) { |
Although the value stored to 'c' is used in the enclosing expression, the value is never actually read from 'c' | |
| 530 | return 0; |
| 531 | } |
| 532 | |
| 533 | /* |
| 534 | * Any urgent data? |
| 535 | */ |
| 536 | if (pfd[TELNET_FD_NET2].revents & POLLRDBAND0x0080) { |
| 537 | SYNCHing = 1; |
| 538 | (void) ttyflush(1); /* flush already enqueued data */ |
| 539 | } |
| 540 | |
| 541 | /* |
| 542 | * Something to read from the network... |
| 543 | */ |
| 544 | if (pfd[TELNET_FD_NET2].revents & (POLLIN0x0001|POLLHUP0x0010)) { |
| 545 | int canread; |
| 546 | |
| 547 | canread = ring_empty_consecutive(&netiring); |
| 548 | c = recv(net, netiring.supply, canread, 0); |
| 549 | if (c == -1 && errno(*__errno()) == EWOULDBLOCK35) { |
| 550 | c = 0; |
| 551 | } else if (c <= 0) { |
| 552 | return -1; |
| 553 | } |
| 554 | if (netdata) { |
| 555 | Dump('<', netiring.supply, c); |
| 556 | } |
| 557 | if (c) |
| 558 | ring_supplied(&netiring, c); |
| 559 | returnValue = 1; |
| 560 | } |
| 561 | |
| 562 | /* |
| 563 | * Something to read from the tty... |
| 564 | */ |
| 565 | if (pfd[TELNET_FD_TIN1].revents & (POLLIN0x0001|POLLHUP0x0010)) { |
| 566 | c = read(tin, ttyiring.supply, ring_empty_consecutive(&ttyiring)); |
| 567 | if (c == -1 && errno(*__errno()) == EIO5) |
| 568 | c = 0; |
| 569 | if (c == -1 && errno(*__errno()) == EWOULDBLOCK35) { |
| 570 | c = 0; |
| 571 | } else { |
| 572 | /* EOF detection for line mode!!!! */ |
| 573 | if ((c == 0) && MODE_LOCAL_CHARS(globalmode)((globalmode)&(0x01|0x02)) && isatty(tin)) { |
| 574 | /* must be an EOF... */ |
| 575 | *ttyiring.supply = termEofCharnew_tc.c_cc[0]; |
| 576 | c = 1; |
| 577 | } |
| 578 | if (c <= 0) { |
| 579 | return -1; |
| 580 | } |
| 581 | if (termdata) { |
| 582 | Dump('<', ttyiring.supply, c); |
| 583 | } |
| 584 | ring_supplied(&ttyiring, c); |
| 585 | } |
| 586 | returnValue = 1; /* did something useful */ |
| 587 | } |
| 588 | |
| 589 | if (pfd[TELNET_FD_NET2].revents & POLLOUT0x0004) { |
| 590 | returnValue |= netflush(); |
| 591 | } |
| 592 | if (pfd[TELNET_FD_TOUT0].revents & POLLOUT0x0004) { |
| 593 | returnValue |= (ttyflush(SYNCHing|flushout) > 0); |
| 594 | } |
| 595 | |
| 596 | return returnValue; |
| 597 | } |