Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 1 | /* $OpenBSD: netcat.c,v 1.103 2011/10/04 08:34:34 fgsch Exp $ */ |
| 2 | /* |
| 3 | * Copyright (c) 2001 Eric Jackson <ericj@monkey.org> |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 28 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 29 | /* |
| 30 | * Re-written nc(1) for OpenBSD. Original implementation by |
| 31 | * *Hobbit* <hobbit@avian.org>. |
| 32 | */ |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 33 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 34 | #include <sys/types.h> |
| 35 | #include <sys/socket.h> |
| 36 | #include <sys/time.h> |
| 37 | #include <sys/un.h> |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 38 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 39 | #include <netinet/in.h> |
| 40 | #include <netinet/in_systm.h> |
| 41 | #include <netinet/tcp.h> |
| 42 | #include <netinet/ip.h> |
| 43 | #include <arpa/telnet.h> |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 44 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 45 | #include <err.h> |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 46 | #include <errno.h> |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 47 | #include <netdb.h> |
| 48 | #include <poll.h> |
| 49 | #include <stdarg.h> |
| 50 | #include <stdio.h> |
| 51 | #include <stdlib.h> |
| 52 | #include <string.h> |
| 53 | #include <unistd.h> |
| 54 | #include <fcntl.h> |
| 55 | #include <limits.h> |
| 56 | #include "atomicio.h" |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 57 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 58 | #ifndef SUN_LEN |
| 59 | #define SUN_LEN(su) \ |
| 60 | (sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path)) |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 61 | #endif |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 62 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 63 | #define PORT_MAX 65535 |
| 64 | #define PORT_MAX_LEN 6 |
| 65 | #define UNIX_DG_TMP_SOCKET_SIZE 19 |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 66 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 67 | /* Command Line Options */ |
| 68 | int dflag; /* detached, no stdin */ |
| 69 | unsigned int iflag; /* Interval Flag */ |
| 70 | #ifdef ANDROID |
| 71 | int jflag = 0; |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 72 | #else |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 73 | int jflag; /* use jumbo frames if we can */ |
| 74 | #endif /* !ANDROID */ |
| 75 | int kflag; /* More than one connect */ |
| 76 | int lflag; /* Bind to local port */ |
| 77 | int nflag; /* Don't do name look up */ |
| 78 | char *Pflag; /* Proxy username */ |
| 79 | char *pflag; /* Localport flag */ |
| 80 | int rflag; /* Random ports flag */ |
| 81 | char *sflag; /* Source Address */ |
| 82 | int tflag; /* Telnet Emulation */ |
| 83 | int uflag; /* UDP - Default to TCP */ |
| 84 | int vflag; /* Verbosity */ |
| 85 | #ifndef ANDROID |
| 86 | int xflag; /* Socks proxy */ |
| 87 | #endif /* !ANDROID */ |
| 88 | int zflag; /* Port Scan Flag */ |
| 89 | int Dflag; /* sodebug */ |
| 90 | int Iflag; /* TCP receive buffer size */ |
| 91 | int Oflag; /* TCP send buffer size */ |
| 92 | #ifndef ANDROID |
| 93 | int Sflag; /* TCP MD5 signature option */ |
| 94 | int Tflag = -1; /* IP Type of Service */ |
| 95 | u_int rtableid; |
| 96 | #endif /* !ANDROID */ |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 97 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 98 | int timeout = -1; |
| 99 | int family = AF_UNSPEC; |
| 100 | char *portlist[PORT_MAX+1]; |
| 101 | char *unix_dg_tmp_socket; |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 102 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 103 | void atelnet(int, unsigned char *, unsigned int); |
| 104 | void build_ports(char *); |
| 105 | void help(void); |
| 106 | int local_listen(char *, char *, struct addrinfo); |
| 107 | void readwrite(int); |
| 108 | int remote_connect(const char *, const char *, struct addrinfo); |
| 109 | int timeout_connect(int, const struct sockaddr *, socklen_t); |
| 110 | #ifndef ANDROID |
| 111 | int socks_connect(const char *, const char *, struct addrinfo, |
| 112 | const char *, const char *, struct addrinfo, int, const char *); |
| 113 | #endif /* !ANDROID */ |
| 114 | int udptest(int); |
| 115 | int unix_bind(char *); |
| 116 | int unix_connect(char *); |
| 117 | int unix_listen(char *); |
| 118 | void set_common_sockopts(int); |
| 119 | int map_tos(char *, int *); |
| 120 | void usage(int); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 121 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 122 | int |
| 123 | main(int argc, char *argv[]) |
| 124 | { |
| 125 | int ch, s, ret, socksv; |
| 126 | char *host, *uport; |
| 127 | struct addrinfo hints; |
| 128 | struct servent *sv; |
| 129 | socklen_t len; |
| 130 | struct sockaddr_storage cliaddr; |
| 131 | char *proxy; |
| 132 | const char *errstr, *proxyhost = "", *proxyport = NULL; |
| 133 | struct addrinfo proxyhints; |
| 134 | char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE]; |
| 135 | |
| 136 | ret = 1; |
| 137 | s = 0; |
| 138 | socksv = 5; |
| 139 | host = NULL; |
| 140 | uport = NULL; |
| 141 | sv = NULL; |
| 142 | |
| 143 | while ((ch = getopt(argc, argv, |
| 144 | "46DdhI:i:jklnO:P:p:rSs:tT:UuV:vw:X:x:z")) != -1) { |
| 145 | switch (ch) { |
| 146 | case '4': |
| 147 | family = AF_INET; |
| 148 | break; |
| 149 | case '6': |
| 150 | family = AF_INET6; |
| 151 | break; |
| 152 | case 'U': |
| 153 | family = AF_UNIX; |
| 154 | break; |
| 155 | case 'X': |
| 156 | if (strcasecmp(optarg, "connect") == 0) |
| 157 | socksv = -1; /* HTTP proxy CONNECT */ |
| 158 | else if (strcmp(optarg, "4") == 0) |
| 159 | socksv = 4; /* SOCKS v.4 */ |
| 160 | else if (strcmp(optarg, "5") == 0) |
| 161 | socksv = 5; /* SOCKS v.5 */ |
| 162 | else |
| 163 | errx(1, "unsupported proxy protocol"); |
| 164 | break; |
| 165 | case 'd': |
| 166 | dflag = 1; |
| 167 | break; |
| 168 | case 'h': |
| 169 | help(); |
| 170 | break; |
| 171 | case 'i': |
| 172 | #ifdef ANDROID |
| 173 | iflag = atoi(optarg); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 174 | #else |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 175 | iflag = strtonum(optarg, 0, UINT_MAX, &errstr); |
| 176 | if (errstr) |
| 177 | errx(1, "interval %s: %s", errstr, optarg); |
| 178 | #endif /* ANDROID */ |
| 179 | break; |
| 180 | #ifndef ANDROID |
| 181 | case 'j': |
| 182 | jflag = 1; |
| 183 | break; |
| 184 | #endif /* !ANDROID */ |
| 185 | case 'k': |
| 186 | kflag = 1; |
| 187 | break; |
| 188 | case 'l': |
| 189 | lflag = 1; |
| 190 | break; |
| 191 | case 'n': |
| 192 | nflag = 1; |
| 193 | break; |
| 194 | case 'P': |
| 195 | Pflag = optarg; |
| 196 | break; |
| 197 | case 'p': |
| 198 | pflag = optarg; |
| 199 | break; |
| 200 | case 'r': |
| 201 | rflag = 1; |
| 202 | break; |
| 203 | case 's': |
| 204 | sflag = optarg; |
| 205 | break; |
| 206 | case 't': |
| 207 | tflag = 1; |
| 208 | break; |
| 209 | case 'u': |
| 210 | uflag = 1; |
| 211 | break; |
| 212 | #ifndef ANDROID |
| 213 | case 'V': |
| 214 | rtableid = (unsigned int)strtonum(optarg, 0, |
| 215 | RT_TABLEID_MAX, &errstr); |
| 216 | if (errstr) |
| 217 | errx(1, "rtable %s: %s", errstr, optarg); |
| 218 | break; |
| 219 | #endif /* !ANDROID */ |
| 220 | case 'v': |
| 221 | vflag = 1; |
| 222 | break; |
| 223 | case 'w': |
| 224 | #ifdef ANDROID |
| 225 | timeout = atoi(optarg); |
| 226 | #else |
| 227 | timeout = strtonum(optarg, 0, INT_MAX / 1000, &errstr); |
| 228 | if (errstr) |
| 229 | errx(1, "timeout %s: %s", errstr, optarg); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 230 | #endif |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 231 | timeout *= 1000; |
| 232 | break; |
| 233 | #ifndef ANDROID |
| 234 | case 'x': |
| 235 | xflag = 1; |
| 236 | if ((proxy = strdup(optarg)) == NULL) |
| 237 | err(1, NULL); |
| 238 | break; |
| 239 | #endif /* !ANDROID */ |
| 240 | case 'z': |
| 241 | zflag = 1; |
| 242 | break; |
| 243 | case 'D': |
| 244 | Dflag = 1; |
| 245 | break; |
| 246 | case 'I': |
| 247 | #ifdef ANDROID |
| 248 | Iflag = atoi(optarg); |
| 249 | #else |
| 250 | Iflag = strtonum(optarg, 1, 65536 << 14, &errstr); |
| 251 | if (errstr != NULL) |
| 252 | errx(1, "TCP receive window %s: %s", |
| 253 | errstr, optarg); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 254 | #endif |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 255 | break; |
| 256 | case 'O': |
| 257 | #ifdef ANDROID |
| 258 | Oflag = atoi(optarg); |
| 259 | #else |
| 260 | Oflag = strtonum(optarg, 1, 65536 << 14, &errstr); |
| 261 | if (errstr != NULL) |
| 262 | errx(1, "TCP send window %s: %s", |
| 263 | errstr, optarg); |
| 264 | #endif |
| 265 | break; |
| 266 | #ifndef ANDROID |
| 267 | case 'S': |
| 268 | Sflag = 1; |
| 269 | break; |
| 270 | case 'T': |
| 271 | errstr = NULL; |
| 272 | errno = 0; |
| 273 | if (map_tos(optarg, &Tflag)) |
| 274 | break; |
| 275 | if (strlen(optarg) > 1 && optarg[0] == '0' && |
| 276 | optarg[1] == 'x') |
| 277 | Tflag = (int)strtol(optarg, NULL, 16); |
| 278 | else |
| 279 | Tflag = (int)strtonum(optarg, 0, 255, |
| 280 | &errstr); |
| 281 | if (Tflag < 0 || Tflag > 255 || errstr || errno) |
| 282 | errx(1, "illegal tos value %s", optarg); |
| 283 | break; |
| 284 | #endif /* !ANDROID */ |
| 285 | default: |
| 286 | usage(1); |
| 287 | } |
| 288 | } |
| 289 | argc -= optind; |
| 290 | argv += optind; |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 291 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 292 | /* Cruft to make sure options are clean, and used properly. */ |
| 293 | if (argv[0] && !argv[1] && family == AF_UNIX) { |
| 294 | host = argv[0]; |
| 295 | uport = NULL; |
| 296 | } else if (argv[0] && !argv[1]) { |
| 297 | if (!lflag) |
| 298 | usage(1); |
| 299 | uport = argv[0]; |
| 300 | host = NULL; |
| 301 | } else if (argv[0] && argv[1]) { |
| 302 | host = argv[0]; |
| 303 | uport = argv[1]; |
| 304 | } else |
| 305 | usage(1); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 306 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 307 | if (lflag && sflag) |
| 308 | errx(1, "cannot use -s and -l"); |
| 309 | if (lflag && pflag) |
| 310 | errx(1, "cannot use -p and -l"); |
| 311 | if (lflag && zflag) |
| 312 | errx(1, "cannot use -z and -l"); |
| 313 | if (!lflag && kflag) |
| 314 | errx(1, "must use -l with -k"); |
| 315 | |
| 316 | /* Get name of temporary socket for unix datagram client */ |
| 317 | if ((family == AF_UNIX) && uflag && !lflag) { |
| 318 | if (sflag) { |
| 319 | unix_dg_tmp_socket = sflag; |
| 320 | } else { |
| 321 | strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX", |
| 322 | UNIX_DG_TMP_SOCKET_SIZE); |
| 323 | if (mktemp(unix_dg_tmp_socket_buf) == NULL) |
| 324 | err(1, "mktemp"); |
| 325 | unix_dg_tmp_socket = unix_dg_tmp_socket_buf; |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | /* Initialize addrinfo structure. */ |
| 330 | if (family != AF_UNIX) { |
| 331 | memset(&hints, 0, sizeof(struct addrinfo)); |
| 332 | hints.ai_family = family; |
| 333 | hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM; |
| 334 | hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP; |
| 335 | if (nflag) |
| 336 | hints.ai_flags |= AI_NUMERICHOST; |
| 337 | } |
| 338 | |
| 339 | #ifndef ANDROID |
| 340 | if (xflag) { |
| 341 | if (uflag) |
| 342 | errx(1, "no proxy support for UDP mode"); |
| 343 | |
| 344 | if (lflag) |
| 345 | errx(1, "no proxy support for listen"); |
| 346 | |
| 347 | if (family == AF_UNIX) |
| 348 | errx(1, "no proxy support for unix sockets"); |
| 349 | |
| 350 | /* XXX IPv6 transport to proxy would probably work */ |
| 351 | if (family == AF_INET6) |
| 352 | errx(1, "no proxy support for IPv6"); |
| 353 | |
| 354 | if (sflag) |
| 355 | errx(1, "no proxy support for local source address"); |
| 356 | |
| 357 | proxyhost = strsep(&proxy, ":"); |
| 358 | proxyport = proxy; |
| 359 | |
| 360 | memset(&proxyhints, 0, sizeof(struct addrinfo)); |
| 361 | proxyhints.ai_family = family; |
| 362 | proxyhints.ai_socktype = SOCK_STREAM; |
| 363 | proxyhints.ai_protocol = IPPROTO_TCP; |
| 364 | if (nflag) |
| 365 | proxyhints.ai_flags |= AI_NUMERICHOST; |
| 366 | } |
| 367 | #endif /* !ANDROID */ |
| 368 | |
| 369 | if (lflag) { |
| 370 | int connfd; |
| 371 | ret = 0; |
| 372 | |
| 373 | if (family == AF_UNIX) { |
| 374 | if (uflag) |
| 375 | s = unix_bind(host); |
| 376 | else |
| 377 | s = unix_listen(host); |
| 378 | } |
| 379 | |
| 380 | /* Allow only one connection at a time, but stay alive. */ |
| 381 | for (;;) { |
| 382 | if (family != AF_UNIX) |
| 383 | s = local_listen(host, uport, hints); |
| 384 | if (s < 0) |
| 385 | err(1, NULL); |
| 386 | /* |
| 387 | * For UDP, we will use recvfrom() initially |
| 388 | * to wait for a caller, then use the regular |
| 389 | * functions to talk to the caller. |
| 390 | */ |
| 391 | if (uflag) { |
| 392 | int rv, plen; |
| 393 | char buf[16384]; |
| 394 | struct sockaddr_storage z; |
| 395 | |
| 396 | len = sizeof(z); |
| 397 | plen = jflag ? 16384 : 2048; |
| 398 | rv = recvfrom(s, buf, plen, MSG_PEEK, |
| 399 | (struct sockaddr *)&z, &len); |
| 400 | if (rv < 0) |
| 401 | err(1, "recvfrom"); |
| 402 | |
| 403 | rv = connect(s, (struct sockaddr *)&z, len); |
| 404 | if (rv < 0) |
| 405 | err(1, "connect"); |
| 406 | |
| 407 | readwrite(s); |
| 408 | } else { |
| 409 | len = sizeof(cliaddr); |
| 410 | connfd = accept(s, (struct sockaddr *)&cliaddr, |
| 411 | &len); |
| 412 | readwrite(connfd); |
| 413 | close(connfd); |
| 414 | } |
| 415 | |
| 416 | if (family != AF_UNIX) |
| 417 | close(s); |
| 418 | else if (uflag) { |
| 419 | if (connect(s, NULL, 0) < 0) |
| 420 | err(1, "connect"); |
| 421 | } |
| 422 | |
| 423 | if (!kflag) |
| 424 | break; |
| 425 | } |
| 426 | } else if (family == AF_UNIX) { |
| 427 | ret = 0; |
| 428 | |
| 429 | if ((s = unix_connect(host)) > 0 && !zflag) { |
| 430 | readwrite(s); |
| 431 | close(s); |
| 432 | } else |
| 433 | ret = 1; |
| 434 | |
| 435 | if (uflag) |
| 436 | unlink(unix_dg_tmp_socket); |
| 437 | exit(ret); |
| 438 | |
| 439 | } else { |
| 440 | int i = 0; |
| 441 | |
| 442 | /* Construct the portlist[] array. */ |
| 443 | build_ports(uport); |
| 444 | |
| 445 | /* Cycle through portlist, connecting to each port. */ |
| 446 | for (i = 0; portlist[i] != NULL; i++) { |
| 447 | if (s) |
| 448 | close(s); |
| 449 | |
| 450 | #ifndef ANDROID |
| 451 | if (xflag) |
| 452 | s = socks_connect(host, portlist[i], hints, |
| 453 | proxyhost, proxyport, proxyhints, socksv, |
| 454 | Pflag); |
| 455 | else |
| 456 | #endif /* !ANDROID */ |
| 457 | s = remote_connect(host, portlist[i], hints); |
| 458 | |
| 459 | if (s < 0) |
| 460 | continue; |
| 461 | |
| 462 | ret = 0; |
| 463 | if (vflag || zflag) { |
| 464 | /* For UDP, make sure we are connected. */ |
| 465 | if (uflag) { |
| 466 | if (udptest(s) == -1) { |
| 467 | ret = 1; |
| 468 | continue; |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | /* Don't look up port if -n. */ |
| 473 | if (nflag) |
| 474 | sv = NULL; |
| 475 | else { |
| 476 | sv = getservbyport( |
| 477 | ntohs(atoi(portlist[i])), |
| 478 | uflag ? "udp" : "tcp"); |
| 479 | } |
| 480 | |
| 481 | fprintf(stderr, |
| 482 | "Connection to %s %s port [%s/%s] " |
| 483 | "succeeded!\n", host, portlist[i], |
| 484 | uflag ? "udp" : "tcp", |
| 485 | sv ? sv->s_name : "*"); |
| 486 | } |
| 487 | if (!zflag) |
| 488 | readwrite(s); |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | if (s) |
| 493 | close(s); |
| 494 | |
| 495 | exit(ret); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 496 | } |
| 497 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 498 | /* |
| 499 | * unix_bind() |
| 500 | * Returns a unix socket bound to the given path |
| 501 | */ |
| 502 | int |
| 503 | unix_bind(char *path) |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 504 | { |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 505 | struct sockaddr_un sun; |
| 506 | int s; |
| 507 | |
| 508 | /* Create unix domain socket. */ |
| 509 | if ((s = socket(AF_UNIX, uflag ? SOCK_DGRAM : SOCK_STREAM, |
| 510 | 0)) < 0) |
| 511 | return (-1); |
| 512 | |
| 513 | memset(&sun, 0, sizeof(struct sockaddr_un)); |
| 514 | sun.sun_family = AF_UNIX; |
| 515 | |
| 516 | if (strlcpy(sun.sun_path, path, sizeof(sun.sun_path)) >= |
| 517 | sizeof(sun.sun_path)) { |
| 518 | close(s); |
| 519 | errno = ENAMETOOLONG; |
| 520 | return (-1); |
| 521 | } |
| 522 | |
| 523 | if (bind(s, (struct sockaddr *)&sun, SUN_LEN(&sun)) < 0) { |
| 524 | close(s); |
| 525 | return (-1); |
| 526 | } |
| 527 | return (s); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 528 | } |
| 529 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 530 | /* |
| 531 | * unix_connect() |
| 532 | * Returns a socket connected to a local unix socket. Returns -1 on failure. |
| 533 | */ |
| 534 | int |
| 535 | unix_connect(char *path) |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 536 | { |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 537 | struct sockaddr_un sun; |
| 538 | int s; |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 539 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 540 | if (uflag) { |
| 541 | if ((s = unix_bind(unix_dg_tmp_socket)) < 0) |
| 542 | return (-1); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 543 | } else { |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 544 | if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) |
| 545 | return (-1); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 546 | } |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 547 | (void)fcntl(s, F_SETFD, 1); |
| 548 | |
| 549 | memset(&sun, 0, sizeof(struct sockaddr_un)); |
| 550 | sun.sun_family = AF_UNIX; |
| 551 | |
| 552 | if (strlcpy(sun.sun_path, path, sizeof(sun.sun_path)) >= |
| 553 | sizeof(sun.sun_path)) { |
| 554 | close(s); |
| 555 | errno = ENAMETOOLONG; |
| 556 | return (-1); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 557 | } |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 558 | if (connect(s, (struct sockaddr *)&sun, SUN_LEN(&sun)) < 0) { |
| 559 | close(s); |
| 560 | return (-1); |
| 561 | } |
| 562 | return (s); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 563 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 564 | } |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 565 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 566 | /* |
| 567 | * unix_listen() |
| 568 | * Create a unix domain socket, and listen on it. |
| 569 | */ |
| 570 | int |
| 571 | unix_listen(char *path) |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 572 | { |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 573 | int s; |
| 574 | if ((s = unix_bind(path)) < 0) |
| 575 | return (-1); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 576 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 577 | if (listen(s, 5) < 0) { |
| 578 | close(s); |
| 579 | return (-1); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 580 | } |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 581 | return (s); |
| 582 | } |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 583 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 584 | /* |
| 585 | * remote_connect() |
| 586 | * Returns a socket connected to a remote host. Properly binds to a local |
| 587 | * port or source address if needed. Returns -1 on failure. |
| 588 | */ |
| 589 | int |
| 590 | remote_connect(const char *host, const char *port, struct addrinfo hints) |
| 591 | { |
| 592 | struct addrinfo *res, *res0; |
| 593 | int s, error, on = 1; |
| 594 | |
| 595 | if ((error = getaddrinfo(host, port, &hints, &res))) |
| 596 | errx(1, "getaddrinfo: %s", gai_strerror(error)); |
| 597 | |
| 598 | res0 = res; |
| 599 | do { |
| 600 | if ((s = socket(res0->ai_family, res0->ai_socktype, |
| 601 | res0->ai_protocol)) < 0) |
| 602 | continue; |
| 603 | |
| 604 | #ifndef ANDROID |
| 605 | if (rtableid) { |
| 606 | if (setsockopt(s, SOL_SOCKET, SO_RTABLE, &rtableid, |
| 607 | sizeof(rtableid)) == -1) |
| 608 | err(1, "setsockopt SO_RTABLE"); |
| 609 | } |
| 610 | #endif /* !ANDROID */ |
| 611 | |
| 612 | /* Bind to a local port or source address if specified. */ |
| 613 | if (sflag || pflag) { |
| 614 | struct addrinfo ahints, *ares; |
| 615 | |
| 616 | #ifndef ANDROID |
| 617 | /* try SO_BINDANY, but don't insist */ |
| 618 | setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on)); |
| 619 | #endif /* !ANDROID */ |
| 620 | memset(&ahints, 0, sizeof(struct addrinfo)); |
| 621 | ahints.ai_family = res0->ai_family; |
| 622 | ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM; |
| 623 | ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP; |
| 624 | ahints.ai_flags = AI_PASSIVE; |
| 625 | if ((error = getaddrinfo(sflag, pflag, &ahints, &ares))) |
| 626 | errx(1, "getaddrinfo: %s", gai_strerror(error)); |
| 627 | |
| 628 | if (bind(s, (struct sockaddr *)ares->ai_addr, |
| 629 | ares->ai_addrlen) < 0) |
| 630 | errx(1, "bind failed: %s", strerror(errno)); |
| 631 | freeaddrinfo(ares); |
| 632 | } |
| 633 | |
| 634 | set_common_sockopts(s); |
| 635 | |
| 636 | if (timeout_connect(s, res0->ai_addr, res0->ai_addrlen) == 0) |
| 637 | break; |
| 638 | else if (vflag) |
| 639 | warn("connect to %s port %s (%s) failed", host, port, |
| 640 | uflag ? "udp" : "tcp"); |
| 641 | |
| 642 | close(s); |
| 643 | s = -1; |
| 644 | } while ((res0 = res0->ai_next) != NULL); |
| 645 | |
| 646 | freeaddrinfo(res); |
| 647 | |
| 648 | return (s); |
| 649 | } |
| 650 | |
| 651 | int |
| 652 | timeout_connect(int s, const struct sockaddr *name, socklen_t namelen) |
| 653 | { |
| 654 | struct pollfd pfd; |
| 655 | socklen_t optlen; |
| 656 | int flags, optval; |
| 657 | int ret; |
| 658 | |
| 659 | if (timeout != -1) { |
| 660 | flags = fcntl(s, F_GETFL, 0); |
| 661 | if (fcntl(s, F_SETFL, flags | O_NONBLOCK) == -1) |
| 662 | err(1, "set non-blocking mode"); |
| 663 | } |
| 664 | |
| 665 | if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) { |
| 666 | pfd.fd = s; |
| 667 | pfd.events = POLLOUT; |
| 668 | if ((ret = poll(&pfd, 1, timeout)) == 1) { |
| 669 | optlen = sizeof(optval); |
| 670 | if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR, |
| 671 | &optval, &optlen)) == 0) { |
| 672 | errno = optval; |
| 673 | ret = optval == 0 ? 0 : -1; |
| 674 | } |
| 675 | } else if (ret == 0) { |
| 676 | errno = ETIMEDOUT; |
| 677 | ret = -1; |
| 678 | } else |
| 679 | err(1, "poll failed"); |
| 680 | } |
| 681 | |
| 682 | if (timeout != -1 && fcntl(s, F_SETFL, flags) == -1) |
| 683 | err(1, "restoring flags"); |
| 684 | |
| 685 | return (ret); |
| 686 | } |
| 687 | |
| 688 | /* |
| 689 | * local_listen() |
| 690 | * Returns a socket listening on a local port, binds to specified source |
| 691 | * address. Returns -1 on failure. |
| 692 | */ |
| 693 | int |
| 694 | local_listen(char *host, char *port, struct addrinfo hints) |
| 695 | { |
| 696 | struct addrinfo *res, *res0; |
| 697 | int s, ret, x = 1; |
| 698 | int error; |
| 699 | |
| 700 | /* Allow nodename to be null. */ |
| 701 | hints.ai_flags |= AI_PASSIVE; |
| 702 | |
| 703 | /* |
| 704 | * In the case of binding to a wildcard address |
| 705 | * default to binding to an ipv4 address. |
| 706 | */ |
| 707 | if (host == NULL && hints.ai_family == AF_UNSPEC) |
| 708 | hints.ai_family = AF_INET; |
| 709 | |
| 710 | if ((error = getaddrinfo(host, port, &hints, &res))) |
| 711 | errx(1, "getaddrinfo: %s", gai_strerror(error)); |
| 712 | |
| 713 | res0 = res; |
| 714 | do { |
| 715 | if ((s = socket(res0->ai_family, res0->ai_socktype, |
| 716 | res0->ai_protocol)) < 0) |
| 717 | continue; |
| 718 | |
| 719 | #ifndef ANDROID |
| 720 | if (rtableid) { |
| 721 | if (setsockopt(s, IPPROTO_IP, SO_RTABLE, &rtableid, |
| 722 | sizeof(rtableid)) == -1) |
| 723 | err(1, "setsockopt SO_RTABLE"); |
| 724 | } |
| 725 | #endif /* !ANDROID */ |
| 726 | |
| 727 | #ifdef ANDROID |
| 728 | ret = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &x, sizeof(x)); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 729 | #else |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 730 | ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x)); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 731 | #endif |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 732 | if (ret == -1) |
| 733 | err(1, NULL); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 734 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 735 | set_common_sockopts(s); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 736 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 737 | if (bind(s, (struct sockaddr *)res0->ai_addr, |
| 738 | res0->ai_addrlen) == 0) |
| 739 | break; |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 740 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 741 | close(s); |
| 742 | s = -1; |
| 743 | } while ((res0 = res0->ai_next) != NULL); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 744 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 745 | if (!uflag && s != -1) { |
| 746 | if (listen(s, 1) < 0) |
| 747 | err(1, "listen"); |
| 748 | } |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 749 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 750 | freeaddrinfo(res); |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 751 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 752 | return (s); |
| 753 | } |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 754 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 755 | /* |
| 756 | * readwrite() |
| 757 | * Loop that polls on the network file descriptor and stdin. |
| 758 | */ |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 759 | void |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 760 | readwrite(int nfd) |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 761 | { |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 762 | struct pollfd pfd[2]; |
| 763 | unsigned char buf[16384]; |
| 764 | int n, wfd = fileno(stdin); |
| 765 | int lfd = fileno(stdout); |
| 766 | int plen; |
The Android Open Source Project | 5e0936b | 2009-03-03 19:30:07 -0800 | [diff] [blame] | 767 | |
Nick Kralevich | e4e83f8 | 2011-10-24 15:44:27 -0700 | [diff] [blame] | 768 | plen = jflag ? 16384 : 2048; |
| 769 | |
| 770 | /* Setup Network FD */ |
| 771 | pfd[0].fd = nfd; |
| 772 | pfd[0].events = POLLIN; |
| 773 | |
| 774 | /* Set up STDIN FD. */ |
| 775 | pfd[1].fd = wfd; |
| 776 | pfd[1].events = POLLIN; |
| 777 | |
| 778 | while (pfd[0].fd != -1) { |
| 779 | if (iflag) |
| 780 | sleep(iflag); |
| 781 | |
| 782 | if ((n = poll(pfd, 2 - dflag, timeout)) < 0) { |
| 783 | close(nfd); |
| 784 | err(1, "Polling Error"); |
| 785 | } |
| 786 | |
| 787 | if (n == 0) |
| 788 | return; |
| 789 | |
| 790 | if (pfd[0].revents & POLLIN) { |
| 791 | if ((n = read(nfd, buf, plen)) < 0) |
| 792 | return; |
| 793 | else if (n == 0) { |
| 794 | shutdown(nfd, SHUT_RD); |
| 795 | pfd[0].fd = -1; |
| 796 | pfd[0].events = 0; |
| 797 | } else { |
| 798 | if (tflag) |
| 799 | atelnet(nfd, buf, n); |
| 800 | if (atomicio(vwrite, lfd, buf, n) != n) |
| 801 | return; |
| 802 | } |
| 803 | } |
| 804 | |
| 805 | if (!dflag && pfd[1].revents & POLLIN) { |
| 806 | if ((n = read(wfd, buf, plen)) < 0) |
| 807 | return; |
| 808 | else if (n == 0) { |
| 809 | shutdown(nfd, SHUT_WR); |
| 810 | pfd[1].fd = -1; |
| 811 | pfd[1].events = 0; |
| 812 | } else { |
| 813 | if (atomicio(vwrite, nfd, buf, n) != n) |
| 814 | return; |
| 815 | } |
| 816 | } |
| 817 | } |
| 818 | } |
| 819 | |
| 820 | /* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */ |
| 821 | void |
| 822 | atelnet(int nfd, unsigned char *buf, unsigned int size) |
| 823 | { |
| 824 | unsigned char *p, *end; |
| 825 | unsigned char obuf[4]; |
| 826 | |
| 827 | if (size < 3) |
| 828 | return; |
| 829 | end = buf + size - 2; |
| 830 | |
| 831 | for (p = buf; p < end; p++) { |
| 832 | if (*p != IAC) |
| 833 | continue; |
| 834 | |
| 835 | obuf[0] = IAC; |
| 836 | p++; |
| 837 | if ((*p == WILL) || (*p == WONT)) |
| 838 | obuf[1] = DONT; |
| 839 | else if ((*p == DO) || (*p == DONT)) |
| 840 | obuf[1] = WONT; |
| 841 | else |
| 842 | continue; |
| 843 | |
| 844 | p++; |
| 845 | obuf[2] = *p; |
| 846 | if (atomicio(vwrite, nfd, obuf, 3) != 3) |
| 847 | warn("Write Error!"); |
| 848 | } |
| 849 | } |
| 850 | |
| 851 | /* |
| 852 | * build_ports() |
| 853 | * Build an array or ports in portlist[], listing each port |
| 854 | * that we should try to connect to. |
| 855 | */ |
| 856 | void |
| 857 | build_ports(char *p) |
| 858 | { |
| 859 | const char *errstr; |
| 860 | char *n; |
| 861 | int hi, lo, cp; |
| 862 | int x = 0; |
| 863 | |
| 864 | if ((n = strchr(p, '-')) != NULL) { |
| 865 | if (lflag) |
| 866 | errx(1, "Cannot use -l with multiple ports!"); |
| 867 | |
| 868 | *n = '\0'; |
| 869 | n++; |
| 870 | |
| 871 | /* Make sure the ports are in order: lowest->highest. */ |
| 872 | #ifdef ANDROID |
| 873 | hi = atoi(n); |
| 874 | #else |
| 875 | hi = strtonum(n, 1, PORT_MAX, &errstr); |
| 876 | if (errstr) |
| 877 | errx(1, "port number %s: %s", errstr, n); |
| 878 | #endif |
| 879 | #ifdef ANDROID |
| 880 | lo = atoi(p); |
| 881 | #else |
| 882 | lo = strtonum(p, 1, PORT_MAX, &errstr); |
| 883 | if (errstr) |
| 884 | errx(1, "port number %s: %s", errstr, p); |
| 885 | #endif |
| 886 | |
| 887 | if (lo > hi) { |
| 888 | cp = hi; |
| 889 | hi = lo; |
| 890 | lo = cp; |
| 891 | } |
| 892 | |
| 893 | /* Load ports sequentially. */ |
| 894 | for (cp = lo; cp <= hi; cp++) { |
| 895 | portlist[x] = calloc(1, PORT_MAX_LEN); |
| 896 | if (portlist[x] == NULL) |
| 897 | err(1, NULL); |
| 898 | snprintf(portlist[x], PORT_MAX_LEN, "%d", cp); |
| 899 | x++; |
| 900 | } |
| 901 | |
| 902 | /* Randomly swap ports. */ |
| 903 | if (rflag) { |
| 904 | int y; |
| 905 | char *c; |
| 906 | |
| 907 | for (x = 0; x <= (hi - lo); x++) { |
| 908 | y = (arc4random() & 0xFFFF) % (hi - lo); |
| 909 | c = portlist[x]; |
| 910 | portlist[x] = portlist[y]; |
| 911 | portlist[y] = c; |
| 912 | } |
| 913 | } |
| 914 | } else { |
| 915 | #ifdef ANDROID |
| 916 | hi = atoi(p); |
| 917 | #else |
| 918 | hi = strtonum(p, 1, PORT_MAX, &errstr); |
| 919 | if (errstr) |
| 920 | errx(1, "port number %s: %s", errstr, p); |
| 921 | #endif |
| 922 | portlist[0] = strdup(p); |
| 923 | if (portlist[0] == NULL) |
| 924 | err(1, NULL); |
| 925 | } |
| 926 | } |
| 927 | |
| 928 | /* |
| 929 | * udptest() |
| 930 | * Do a few writes to see if the UDP port is there. |
| 931 | * XXX - Better way of doing this? Doesn't work for IPv6. |
| 932 | * Also fails after around 100 ports checked. |
| 933 | */ |
| 934 | int |
| 935 | udptest(int s) |
| 936 | { |
| 937 | int i, ret; |
| 938 | |
| 939 | for (i = 0; i <= 3; i++) { |
| 940 | if (write(s, "X", 1) == 1) |
| 941 | ret = 1; |
| 942 | else |
| 943 | ret = -1; |
| 944 | } |
| 945 | return (ret); |
| 946 | } |
| 947 | |
| 948 | void |
| 949 | set_common_sockopts(int s) |
| 950 | { |
| 951 | int x = 1; |
| 952 | |
| 953 | #ifndef ANDROID |
| 954 | if (Sflag) { |
| 955 | if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG, |
| 956 | &x, sizeof(x)) == -1) |
| 957 | err(1, NULL); |
| 958 | } |
| 959 | #endif |
| 960 | if (Dflag) { |
| 961 | if (setsockopt(s, SOL_SOCKET, SO_DEBUG, |
| 962 | &x, sizeof(x)) == -1) |
| 963 | err(1, NULL); |
| 964 | } |
| 965 | #ifndef ANDROID |
| 966 | if (jflag) { |
| 967 | if (setsockopt(s, SOL_SOCKET, SO_JUMBO, |
| 968 | &x, sizeof(x)) == -1) |
| 969 | err(1, NULL); |
| 970 | } |
| 971 | if (Tflag != -1) { |
| 972 | if (setsockopt(s, IPPROTO_IP, IP_TOS, |
| 973 | &Tflag, sizeof(Tflag)) == -1) |
| 974 | err(1, "set IP ToS"); |
| 975 | } |
| 976 | #endif |
| 977 | if (Iflag) { |
| 978 | if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, |
| 979 | &Iflag, sizeof(Iflag)) == -1) |
| 980 | err(1, "set TCP receive buffer size"); |
| 981 | } |
| 982 | if (Oflag) { |
| 983 | if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, |
| 984 | &Oflag, sizeof(Oflag)) == -1) |
| 985 | err(1, "set TCP send buffer size"); |
| 986 | } |
| 987 | } |
| 988 | |
| 989 | #ifndef ANDROID |
| 990 | int |
| 991 | map_tos(char *s, int *val) |
| 992 | { |
| 993 | /* DiffServ Codepoints and other TOS mappings */ |
| 994 | const struct toskeywords { |
| 995 | const char *keyword; |
| 996 | int val; |
| 997 | } *t, toskeywords[] = { |
| 998 | { "af11", IPTOS_DSCP_AF11 }, |
| 999 | { "af12", IPTOS_DSCP_AF12 }, |
| 1000 | { "af13", IPTOS_DSCP_AF13 }, |
| 1001 | { "af21", IPTOS_DSCP_AF21 }, |
| 1002 | { "af22", IPTOS_DSCP_AF22 }, |
| 1003 | { "af23", IPTOS_DSCP_AF23 }, |
| 1004 | { "af31", IPTOS_DSCP_AF31 }, |
| 1005 | { "af32", IPTOS_DSCP_AF32 }, |
| 1006 | { "af33", IPTOS_DSCP_AF33 }, |
| 1007 | { "af41", IPTOS_DSCP_AF41 }, |
| 1008 | { "af42", IPTOS_DSCP_AF42 }, |
| 1009 | { "af43", IPTOS_DSCP_AF43 }, |
| 1010 | { "critical", IPTOS_PREC_CRITIC_ECP }, |
| 1011 | { "cs0", IPTOS_DSCP_CS0 }, |
| 1012 | { "cs1", IPTOS_DSCP_CS1 }, |
| 1013 | { "cs2", IPTOS_DSCP_CS2 }, |
| 1014 | { "cs3", IPTOS_DSCP_CS3 }, |
| 1015 | { "cs4", IPTOS_DSCP_CS4 }, |
| 1016 | { "cs5", IPTOS_DSCP_CS5 }, |
| 1017 | { "cs6", IPTOS_DSCP_CS6 }, |
| 1018 | { "cs7", IPTOS_DSCP_CS7 }, |
| 1019 | { "ef", IPTOS_DSCP_EF }, |
| 1020 | { "inetcontrol", IPTOS_PREC_INTERNETCONTROL }, |
| 1021 | { "lowdelay", IPTOS_LOWDELAY }, |
| 1022 | { "netcontrol", IPTOS_PREC_NETCONTROL }, |
| 1023 | { "reliability", IPTOS_RELIABILITY }, |
| 1024 | { "throughput", IPTOS_THROUGHPUT }, |
| 1025 | { NULL, -1 }, |
| 1026 | }; |
| 1027 | |
| 1028 | for (t = toskeywords; t->keyword != NULL; t++) { |
| 1029 | if (strcmp(s, t->keyword) == 0) { |
| 1030 | *val = t->val; |
| 1031 | return (1); |
| 1032 | } |
| 1033 | } |
| 1034 | |
| 1035 | return (0); |
| 1036 | } |
| 1037 | #endif |
| 1038 | |
| 1039 | void |
| 1040 | help(void) |
| 1041 | { |
| 1042 | usage(0); |
| 1043 | fprintf(stderr, "\tCommand Summary:\n\ |
| 1044 | \t-4 Use IPv4\n\ |
| 1045 | \t-6 Use IPv6\n\ |
| 1046 | \t-D Enable the debug socket option\n\ |
| 1047 | \t-d Detach from stdin\n\ |
| 1048 | \t-h This help text\n\ |
| 1049 | \t-I length TCP receive buffer length\n\ |
| 1050 | \t-i secs\t Delay interval for lines sent, ports scanned\n\ |
| 1051 | \t-k Keep inbound sockets open for multiple connects\n\ |
| 1052 | \t-l Listen mode, for inbound connects\n\ |
| 1053 | \t-n Suppress name/port resolutions\n\ |
| 1054 | \t-O length TCP send buffer length\n\ |
| 1055 | \t-P proxyuser\tUsername for proxy authentication\n\ |
| 1056 | \t-p port\t Specify local port for remote connects\n\ |
| 1057 | \t-r Randomize remote ports\n\ |
| 1058 | \t-S Enable the TCP MD5 signature option\n\ |
| 1059 | \t-s addr\t Local source address\n\ |
| 1060 | \t-T toskeyword\tSet IP Type of Service\n\ |
| 1061 | \t-t Answer TELNET negotiation\n\ |
| 1062 | \t-U Use UNIX domain socket\n\ |
| 1063 | \t-u UDP mode\n\ |
| 1064 | \t-V rtable Specify alternate routing table\n\ |
| 1065 | \t-v Verbose\n\ |
| 1066 | \t-w secs\t Timeout for connects and final net reads\n\ |
| 1067 | \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\ |
| 1068 | \t-x addr[:port]\tSpecify proxy address and port\n\ |
| 1069 | \t-z Zero-I/O mode [used for scanning]\n\ |
| 1070 | Port numbers can be individual or ranges: lo-hi [inclusive]\n"); |
| 1071 | exit(1); |
| 1072 | } |
| 1073 | |
| 1074 | void |
| 1075 | usage(int ret) |
| 1076 | { |
| 1077 | fprintf(stderr, |
| 1078 | "usage: nc [-46DdhklnrStUuvz] [-I length] [-i interval] [-O length]\n" |
| 1079 | "\t [-P proxy_username] [-p source_port] [-s source] [-T ToS]\n" |
| 1080 | "\t [-V rtable] [-w timeout] [-X proxy_protocol]\n" |
| 1081 | "\t [-x proxy_address[:port]] [destination] [port]\n"); |
| 1082 | if (ret) |
| 1083 | exit(1); |
| 1084 | } |