1285031Sdes/* $OpenBSD: netcat.c,v 1.126 2014/10/30 16:08:31 tedu Exp $ */ 2285031Sdes/* 3285031Sdes * Copyright (c) 2001 Eric Jackson <ericj@monkey.org> 4285031Sdes * 5285031Sdes * Redistribution and use in source and binary forms, with or without 6285031Sdes * modification, are permitted provided that the following conditions 7285031Sdes * are met: 8285031Sdes * 9285031Sdes * 1. Redistributions of source code must retain the above copyright 10285031Sdes * notice, this list of conditions and the following disclaimer. 11285031Sdes * 2. Redistributions in binary form must reproduce the above copyright 12285031Sdes * notice, this list of conditions and the following disclaimer in the 13285031Sdes * documentation and/or other materials provided with the distribution. 14285031Sdes * 3. The name of the author may not be used to endorse or promote products 15285031Sdes * derived from this software without specific prior written permission. 16285031Sdes * 17285031Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18285031Sdes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19285031Sdes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20285031Sdes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21285031Sdes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22285031Sdes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23285031Sdes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24285031Sdes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25285031Sdes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26285031Sdes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27285031Sdes */ 28285031Sdes 29285031Sdes/* 30285031Sdes * Re-written nc(1) for OpenBSD. Original implementation by 31285031Sdes * *Hobbit* <hobbit@avian.org>. 32285031Sdes */ 33285031Sdes 34285031Sdes#include "includes.h" 35285031Sdes 36285031Sdes#include <sys/types.h> 37285031Sdes#include <sys/socket.h> 38285031Sdes#include <sys/time.h> 39285031Sdes#include <sys/uio.h> 40285031Sdes#include <sys/un.h> 41285031Sdes 42285031Sdes#include <netinet/in.h> 43285031Sdes#include <netinet/tcp.h> 44285031Sdes#include <netinet/ip.h> 45285031Sdes 46285031Sdes#include <errno.h> 47285031Sdes#include <netdb.h> 48285031Sdes#include <stdarg.h> 49285031Sdes#include <stdio.h> 50285031Sdes#include <stdlib.h> 51285031Sdes#include <string.h> 52285031Sdes#include <unistd.h> 53285031Sdes#include <fcntl.h> 54285031Sdes#include <limits.h> 55285031Sdes#include "atomicio.h" 56285031Sdes 57285031Sdes#ifdef HAVE_POLL_H 58285031Sdes#include <poll.h> 59285031Sdes#else 60285031Sdes# ifdef HAVE_SYS_POLL_H 61285031Sdes# include <sys/poll.h> 62285031Sdes# endif 63285031Sdes#endif 64323124Sdes#ifdef HAVE_ERR_H 65323124Sdes# include <err.h> 66323124Sdes#endif 67285031Sdes 68295367Sdes/* Telnet options from arpa/telnet.h */ 69295367Sdes#define IAC 255 70295367Sdes#define DONT 254 71295367Sdes#define DO 253 72295367Sdes#define WONT 252 73295367Sdes#define WILL 251 74295367Sdes 75285031Sdes#ifndef SUN_LEN 76285031Sdes#define SUN_LEN(su) \ 77285031Sdes (sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path)) 78285031Sdes#endif 79285031Sdes 80285031Sdes#define PORT_MAX 65535 81285031Sdes#define PORT_MAX_LEN 6 82285031Sdes#define UNIX_DG_TMP_SOCKET_SIZE 19 83285031Sdes 84285031Sdes#define POLL_STDIN 0 85285031Sdes#define POLL_NETOUT 1 86285031Sdes#define POLL_NETIN 2 87285031Sdes#define POLL_STDOUT 3 88285031Sdes#define BUFSIZE 16384 89285031Sdes 90285031Sdes/* Command Line Options */ 91285031Sdesint dflag; /* detached, no stdin */ 92285031Sdesint Fflag; /* fdpass sock to stdout */ 93285031Sdesunsigned int iflag; /* Interval Flag */ 94285031Sdesint kflag; /* More than one connect */ 95285031Sdesint lflag; /* Bind to local port */ 96285031Sdesint Nflag; /* shutdown() network socket */ 97285031Sdesint nflag; /* Don't do name look up */ 98285031Sdeschar *Pflag; /* Proxy username */ 99285031Sdeschar *pflag; /* Localport flag */ 100285031Sdesint rflag; /* Random ports flag */ 101285031Sdeschar *sflag; /* Source Address */ 102285031Sdesint tflag; /* Telnet Emulation */ 103285031Sdesint uflag; /* UDP - Default to TCP */ 104285031Sdesint vflag; /* Verbosity */ 105285031Sdesint xflag; /* Socks proxy */ 106285031Sdesint zflag; /* Port Scan Flag */ 107285031Sdesint Dflag; /* sodebug */ 108285031Sdesint Iflag; /* TCP receive buffer size */ 109285031Sdesint Oflag; /* TCP send buffer size */ 110285031Sdesint Sflag; /* TCP MD5 signature option */ 111285031Sdesint Tflag = -1; /* IP Type of Service */ 112285031Sdesint rtableid = -1; 113285031Sdes 114285031Sdesint timeout = -1; 115285031Sdesint family = AF_UNSPEC; 116285031Sdeschar *portlist[PORT_MAX+1]; 117285031Sdeschar *unix_dg_tmp_socket; 118285031Sdes 119285031Sdesvoid atelnet(int, unsigned char *, unsigned int); 120285031Sdesvoid build_ports(char *); 121285031Sdesvoid help(void); 122285031Sdesint local_listen(char *, char *, struct addrinfo); 123285031Sdesvoid readwrite(int); 124285031Sdesvoid fdpass(int nfd) __attribute__((noreturn)); 125285031Sdesint remote_connect(const char *, const char *, struct addrinfo); 126285031Sdesint timeout_connect(int, const struct sockaddr *, socklen_t); 127285031Sdesint socks_connect(const char *, const char *, struct addrinfo, 128285031Sdes const char *, const char *, struct addrinfo, int, const char *); 129285031Sdesint udptest(int); 130285031Sdesint unix_bind(char *); 131285031Sdesint unix_connect(char *); 132285031Sdesint unix_listen(char *); 133285031Sdesvoid set_common_sockopts(int); 134285031Sdesint map_tos(char *, int *); 135285031Sdesvoid report_connect(const struct sockaddr *, socklen_t); 136285031Sdesvoid usage(int); 137285031Sdesssize_t drainbuf(int, unsigned char *, size_t *); 138285031Sdesssize_t fillbuf(int, unsigned char *, size_t *); 139285031Sdes 140285031Sdes 141285031Sdesint 142285031Sdesmain(int argc, char *argv[]) 143285031Sdes{ 144285031Sdes int ch, s, ret, socksv; 145285031Sdes char *host, *uport; 146285031Sdes struct addrinfo hints; 147285031Sdes struct servent *sv; 148285031Sdes socklen_t len; 149285031Sdes struct sockaddr_storage cliaddr; 150285031Sdes char *proxy = NULL; 151285031Sdes const char *errstr, *proxyhost = "", *proxyport = NULL; 152285031Sdes struct addrinfo proxyhints; 153285031Sdes char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE]; 154285031Sdes 155285031Sdes ret = 1; 156285031Sdes s = 0; 157285031Sdes socksv = 5; 158285031Sdes host = NULL; 159285031Sdes uport = NULL; 160285031Sdes sv = NULL; 161285031Sdes 162285031Sdes while ((ch = getopt(argc, argv, 163285031Sdes "46DdFhI:i:klNnO:P:p:rSs:tT:UuV:vw:X:x:z")) != -1) { 164285031Sdes switch (ch) { 165285031Sdes case '4': 166285031Sdes family = AF_INET; 167285031Sdes break; 168285031Sdes case '6': 169285031Sdes family = AF_INET6; 170285031Sdes break; 171285031Sdes case 'U': 172285031Sdes family = AF_UNIX; 173285031Sdes break; 174285031Sdes case 'X': 175285031Sdes if (strcasecmp(optarg, "connect") == 0) 176285031Sdes socksv = -1; /* HTTP proxy CONNECT */ 177285031Sdes else if (strcmp(optarg, "4") == 0) 178285031Sdes socksv = 4; /* SOCKS v.4 */ 179285031Sdes else if (strcmp(optarg, "5") == 0) 180285031Sdes socksv = 5; /* SOCKS v.5 */ 181285031Sdes else 182285031Sdes errx(1, "unsupported proxy protocol"); 183285031Sdes break; 184285031Sdes case 'd': 185285031Sdes dflag = 1; 186285031Sdes break; 187285031Sdes case 'F': 188285031Sdes Fflag = 1; 189285031Sdes break; 190285031Sdes case 'h': 191285031Sdes help(); 192285031Sdes break; 193285031Sdes case 'i': 194285031Sdes iflag = strtonum(optarg, 0, UINT_MAX, &errstr); 195285031Sdes if (errstr) 196285031Sdes errx(1, "interval %s: %s", errstr, optarg); 197285031Sdes break; 198285031Sdes case 'k': 199285031Sdes kflag = 1; 200285031Sdes break; 201285031Sdes case 'l': 202285031Sdes lflag = 1; 203285031Sdes break; 204285031Sdes case 'N': 205285031Sdes Nflag = 1; 206285031Sdes break; 207285031Sdes case 'n': 208285031Sdes nflag = 1; 209285031Sdes break; 210285031Sdes case 'P': 211285031Sdes Pflag = optarg; 212285031Sdes break; 213285031Sdes case 'p': 214285031Sdes pflag = optarg; 215285031Sdes break; 216285031Sdes case 'r': 217285031Sdes rflag = 1; 218285031Sdes break; 219285031Sdes case 's': 220285031Sdes sflag = optarg; 221285031Sdes break; 222285031Sdes case 't': 223285031Sdes tflag = 1; 224285031Sdes break; 225285031Sdes case 'u': 226285031Sdes uflag = 1; 227285031Sdes break; 228285031Sdes#ifdef SO_RTABLE 229285031Sdes case 'V': 230285031Sdes rtableid = (int)strtonum(optarg, 0, 231285031Sdes RT_TABLEID_MAX, &errstr); 232285031Sdes if (errstr) 233285031Sdes errx(1, "rtable %s: %s", errstr, optarg); 234285031Sdes break; 235285031Sdes#endif 236285031Sdes case 'v': 237285031Sdes vflag = 1; 238285031Sdes break; 239285031Sdes case 'w': 240285031Sdes timeout = strtonum(optarg, 0, INT_MAX / 1000, &errstr); 241285031Sdes if (errstr) 242285031Sdes errx(1, "timeout %s: %s", errstr, optarg); 243285031Sdes timeout *= 1000; 244285031Sdes break; 245285031Sdes case 'x': 246285031Sdes xflag = 1; 247285031Sdes if ((proxy = strdup(optarg)) == NULL) 248285031Sdes errx(1, "strdup"); 249285031Sdes break; 250285031Sdes case 'z': 251285031Sdes zflag = 1; 252285031Sdes break; 253285031Sdes case 'D': 254285031Sdes Dflag = 1; 255285031Sdes break; 256285031Sdes case 'I': 257285031Sdes Iflag = strtonum(optarg, 1, 65536 << 14, &errstr); 258285031Sdes if (errstr != NULL) 259285031Sdes errx(1, "TCP receive window %s: %s", 260285031Sdes errstr, optarg); 261285031Sdes break; 262285031Sdes case 'O': 263285031Sdes Oflag = strtonum(optarg, 1, 65536 << 14, &errstr); 264285031Sdes if (errstr != NULL) 265285031Sdes errx(1, "TCP send window %s: %s", 266285031Sdes errstr, optarg); 267285031Sdes break; 268285031Sdes case 'S': 269285031Sdes Sflag = 1; 270285031Sdes break; 271285031Sdes case 'T': 272285031Sdes errstr = NULL; 273285031Sdes errno = 0; 274285031Sdes if (map_tos(optarg, &Tflag)) 275285031Sdes break; 276285031Sdes if (strlen(optarg) > 1 && optarg[0] == '0' && 277285031Sdes optarg[1] == 'x') 278285031Sdes Tflag = (int)strtol(optarg, NULL, 16); 279285031Sdes else 280285031Sdes Tflag = (int)strtonum(optarg, 0, 255, 281285031Sdes &errstr); 282285031Sdes if (Tflag < 0 || Tflag > 255 || errstr || errno) 283285031Sdes errx(1, "illegal tos value %s", optarg); 284285031Sdes break; 285285031Sdes default: 286285031Sdes usage(1); 287285031Sdes } 288285031Sdes } 289285031Sdes argc -= optind; 290285031Sdes argv += optind; 291285031Sdes 292285031Sdes /* Cruft to make sure options are clean, and used properly. */ 293285031Sdes if (argv[0] && !argv[1] && family == AF_UNIX) { 294285031Sdes host = argv[0]; 295285031Sdes uport = NULL; 296285031Sdes } else if (argv[0] && !argv[1]) { 297285031Sdes if (!lflag) 298285031Sdes usage(1); 299285031Sdes uport = argv[0]; 300285031Sdes host = NULL; 301285031Sdes } else if (argv[0] && argv[1]) { 302285031Sdes host = argv[0]; 303285031Sdes uport = argv[1]; 304285031Sdes } else 305285031Sdes usage(1); 306285031Sdes 307285031Sdes if (lflag && sflag) 308285031Sdes errx(1, "cannot use -s and -l"); 309285031Sdes if (lflag && pflag) 310285031Sdes errx(1, "cannot use -p and -l"); 311285031Sdes if (lflag && zflag) 312285031Sdes errx(1, "cannot use -z and -l"); 313285031Sdes if (!lflag && kflag) 314285031Sdes errx(1, "must use -l with -k"); 315285031Sdes 316285031Sdes /* Get name of temporary socket for unix datagram client */ 317285031Sdes if ((family == AF_UNIX) && uflag && !lflag) { 318285031Sdes if (sflag) { 319285031Sdes unix_dg_tmp_socket = sflag; 320285031Sdes } else { 321285031Sdes strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX", 322285031Sdes UNIX_DG_TMP_SOCKET_SIZE); 323285031Sdes if (mktemp(unix_dg_tmp_socket_buf) == NULL) 324285031Sdes err(1, "mktemp"); 325285031Sdes unix_dg_tmp_socket = unix_dg_tmp_socket_buf; 326285031Sdes } 327285031Sdes } 328285031Sdes 329285031Sdes /* Initialize addrinfo structure. */ 330285031Sdes if (family != AF_UNIX) { 331285031Sdes memset(&hints, 0, sizeof(struct addrinfo)); 332285031Sdes hints.ai_family = family; 333285031Sdes hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM; 334285031Sdes hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP; 335285031Sdes if (nflag) 336285031Sdes hints.ai_flags |= AI_NUMERICHOST; 337285031Sdes } 338285031Sdes 339285031Sdes if (xflag) { 340285031Sdes if (uflag) 341285031Sdes errx(1, "no proxy support for UDP mode"); 342285031Sdes 343285031Sdes if (lflag) 344285031Sdes errx(1, "no proxy support for listen"); 345285031Sdes 346285031Sdes if (family == AF_UNIX) 347285031Sdes errx(1, "no proxy support for unix sockets"); 348285031Sdes 349285031Sdes /* XXX IPv6 transport to proxy would probably work */ 350285031Sdes if (family == AF_INET6) 351285031Sdes errx(1, "no proxy support for IPv6"); 352285031Sdes 353285031Sdes if (sflag) 354285031Sdes errx(1, "no proxy support for local source address"); 355285031Sdes 356285031Sdes proxyhost = strsep(&proxy, ":"); 357285031Sdes proxyport = proxy; 358285031Sdes 359285031Sdes memset(&proxyhints, 0, sizeof(struct addrinfo)); 360285031Sdes proxyhints.ai_family = family; 361285031Sdes proxyhints.ai_socktype = SOCK_STREAM; 362285031Sdes proxyhints.ai_protocol = IPPROTO_TCP; 363285031Sdes if (nflag) 364285031Sdes proxyhints.ai_flags |= AI_NUMERICHOST; 365285031Sdes } 366285031Sdes 367285031Sdes if (lflag) { 368285031Sdes int connfd; 369285031Sdes ret = 0; 370285031Sdes 371285031Sdes if (family == AF_UNIX) { 372285031Sdes if (uflag) 373285031Sdes s = unix_bind(host); 374285031Sdes else 375285031Sdes s = unix_listen(host); 376285031Sdes } 377285031Sdes 378285031Sdes /* Allow only one connection at a time, but stay alive. */ 379285031Sdes for (;;) { 380285031Sdes if (family != AF_UNIX) 381285031Sdes s = local_listen(host, uport, hints); 382285031Sdes if (s < 0) 383285031Sdes err(1, "local_listen"); 384285031Sdes /* 385285031Sdes * For UDP and -k, don't connect the socket, let it 386285031Sdes * receive datagrams from multiple socket pairs. 387285031Sdes */ 388285031Sdes if (uflag && kflag) 389285031Sdes readwrite(s); 390285031Sdes /* 391285031Sdes * For UDP and not -k, we will use recvfrom() initially 392285031Sdes * to wait for a caller, then use the regular functions 393285031Sdes * to talk to the caller. 394285031Sdes */ 395285031Sdes else if (uflag && !kflag) { 396285031Sdes int rv, plen; 397285031Sdes char buf[16384]; 398285031Sdes struct sockaddr_storage z; 399285031Sdes 400285031Sdes len = sizeof(z); 401285031Sdes plen = 2048; 402285031Sdes rv = recvfrom(s, buf, plen, MSG_PEEK, 403285031Sdes (struct sockaddr *)&z, &len); 404285031Sdes if (rv < 0) 405285031Sdes err(1, "recvfrom"); 406285031Sdes 407285031Sdes rv = connect(s, (struct sockaddr *)&z, len); 408285031Sdes if (rv < 0) 409285031Sdes err(1, "connect"); 410285031Sdes 411285031Sdes if (vflag) 412285031Sdes report_connect((struct sockaddr *)&z, len); 413285031Sdes 414285031Sdes readwrite(s); 415285031Sdes } else { 416285031Sdes len = sizeof(cliaddr); 417285031Sdes connfd = accept(s, (struct sockaddr *)&cliaddr, 418285031Sdes &len); 419285031Sdes if (connfd == -1) { 420285031Sdes /* For now, all errnos are fatal */ 421285031Sdes err(1, "accept"); 422285031Sdes } 423285031Sdes if (vflag) 424285031Sdes report_connect((struct sockaddr *)&cliaddr, len); 425285031Sdes 426285031Sdes readwrite(connfd); 427285031Sdes close(connfd); 428285031Sdes } 429285031Sdes 430285031Sdes if (family != AF_UNIX) 431285031Sdes close(s); 432285031Sdes else if (uflag) { 433285031Sdes if (connect(s, NULL, 0) < 0) 434285031Sdes err(1, "connect"); 435285031Sdes } 436285031Sdes 437285031Sdes if (!kflag) 438285031Sdes break; 439285031Sdes } 440285031Sdes } else if (family == AF_UNIX) { 441285031Sdes ret = 0; 442285031Sdes 443285031Sdes if ((s = unix_connect(host)) > 0 && !zflag) { 444285031Sdes readwrite(s); 445285031Sdes close(s); 446285031Sdes } else 447285031Sdes ret = 1; 448285031Sdes 449285031Sdes if (uflag) 450285031Sdes unlink(unix_dg_tmp_socket); 451285031Sdes exit(ret); 452285031Sdes 453285031Sdes } else { 454285031Sdes int i = 0; 455285031Sdes 456285031Sdes /* Construct the portlist[] array. */ 457285031Sdes build_ports(uport); 458285031Sdes 459285031Sdes /* Cycle through portlist, connecting to each port. */ 460285031Sdes for (i = 0; portlist[i] != NULL; i++) { 461285031Sdes if (s) 462285031Sdes close(s); 463285031Sdes 464285031Sdes if (xflag) 465285031Sdes s = socks_connect(host, portlist[i], hints, 466285031Sdes proxyhost, proxyport, proxyhints, socksv, 467285031Sdes Pflag); 468285031Sdes else 469285031Sdes s = remote_connect(host, portlist[i], hints); 470285031Sdes 471285031Sdes if (s < 0) 472285031Sdes continue; 473285031Sdes 474285031Sdes ret = 0; 475285031Sdes if (vflag || zflag) { 476285031Sdes /* For UDP, make sure we are connected. */ 477285031Sdes if (uflag) { 478285031Sdes if (udptest(s) == -1) { 479285031Sdes ret = 1; 480285031Sdes continue; 481285031Sdes } 482285031Sdes } 483285031Sdes 484285031Sdes /* Don't look up port if -n. */ 485285031Sdes if (nflag) 486285031Sdes sv = NULL; 487285031Sdes else { 488285031Sdes sv = getservbyport( 489285031Sdes ntohs(atoi(portlist[i])), 490285031Sdes uflag ? "udp" : "tcp"); 491285031Sdes } 492285031Sdes 493285031Sdes fprintf(stderr, 494285031Sdes "Connection to %s %s port [%s/%s] " 495285031Sdes "succeeded!\n", host, portlist[i], 496285031Sdes uflag ? "udp" : "tcp", 497285031Sdes sv ? sv->s_name : "*"); 498285031Sdes } 499285031Sdes if (Fflag) 500285031Sdes fdpass(s); 501285031Sdes else if (!zflag) 502285031Sdes readwrite(s); 503285031Sdes } 504285031Sdes } 505285031Sdes 506285031Sdes if (s) 507285031Sdes close(s); 508285031Sdes 509285031Sdes exit(ret); 510285031Sdes} 511285031Sdes 512285031Sdes/* 513285031Sdes * unix_bind() 514285031Sdes * Returns a unix socket bound to the given path 515285031Sdes */ 516285031Sdesint 517285031Sdesunix_bind(char *path) 518285031Sdes{ 519285031Sdes struct sockaddr_un sun_sa; 520285031Sdes int s; 521285031Sdes 522285031Sdes /* Create unix domain socket. */ 523285031Sdes if ((s = socket(AF_UNIX, uflag ? SOCK_DGRAM : SOCK_STREAM, 524285031Sdes 0)) < 0) 525285031Sdes return (-1); 526285031Sdes 527285031Sdes memset(&sun_sa, 0, sizeof(struct sockaddr_un)); 528285031Sdes sun_sa.sun_family = AF_UNIX; 529285031Sdes 530285031Sdes if (strlcpy(sun_sa.sun_path, path, sizeof(sun_sa.sun_path)) >= 531285031Sdes sizeof(sun_sa.sun_path)) { 532285031Sdes close(s); 533285031Sdes errno = ENAMETOOLONG; 534285031Sdes return (-1); 535285031Sdes } 536285031Sdes 537285031Sdes if (bind(s, (struct sockaddr *)&sun_sa, SUN_LEN(&sun_sa)) < 0) { 538285031Sdes close(s); 539285031Sdes return (-1); 540285031Sdes } 541285031Sdes return (s); 542285031Sdes} 543285031Sdes 544285031Sdes/* 545285031Sdes * unix_connect() 546285031Sdes * Returns a socket connected to a local unix socket. Returns -1 on failure. 547285031Sdes */ 548285031Sdesint 549285031Sdesunix_connect(char *path) 550285031Sdes{ 551285031Sdes struct sockaddr_un sun_sa; 552285031Sdes int s; 553285031Sdes 554285031Sdes if (uflag) { 555285031Sdes if ((s = unix_bind(unix_dg_tmp_socket)) < 0) 556285031Sdes return (-1); 557285031Sdes } else { 558285031Sdes if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) 559285031Sdes return (-1); 560285031Sdes } 561285031Sdes (void)fcntl(s, F_SETFD, FD_CLOEXEC); 562285031Sdes 563285031Sdes memset(&sun_sa, 0, sizeof(struct sockaddr_un)); 564285031Sdes sun_sa.sun_family = AF_UNIX; 565285031Sdes 566285031Sdes if (strlcpy(sun_sa.sun_path, path, sizeof(sun_sa.sun_path)) >= 567285031Sdes sizeof(sun_sa.sun_path)) { 568285031Sdes close(s); 569285031Sdes errno = ENAMETOOLONG; 570285031Sdes return (-1); 571285031Sdes } 572285031Sdes if (connect(s, (struct sockaddr *)&sun_sa, SUN_LEN(&sun_sa)) < 0) { 573285031Sdes close(s); 574285031Sdes return (-1); 575285031Sdes } 576285031Sdes return (s); 577285031Sdes 578285031Sdes} 579285031Sdes 580285031Sdes/* 581285031Sdes * unix_listen() 582285031Sdes * Create a unix domain socket, and listen on it. 583285031Sdes */ 584285031Sdesint 585285031Sdesunix_listen(char *path) 586285031Sdes{ 587285031Sdes int s; 588285031Sdes if ((s = unix_bind(path)) < 0) 589285031Sdes return (-1); 590285031Sdes 591285031Sdes if (listen(s, 5) < 0) { 592285031Sdes close(s); 593285031Sdes return (-1); 594285031Sdes } 595285031Sdes return (s); 596285031Sdes} 597285031Sdes 598285031Sdes/* 599285031Sdes * remote_connect() 600285031Sdes * Returns a socket connected to a remote host. Properly binds to a local 601285031Sdes * port or source address if needed. Returns -1 on failure. 602285031Sdes */ 603285031Sdesint 604285031Sdesremote_connect(const char *host, const char *port, struct addrinfo hints) 605285031Sdes{ 606285031Sdes struct addrinfo *res, *res0; 607285031Sdes int s, error; 608285031Sdes#if defined(SO_RTABLE) || defined(SO_BINDANY) 609285031Sdes int on = 1; 610285031Sdes#endif 611285031Sdes 612285031Sdes if ((error = getaddrinfo(host, port, &hints, &res))) 613285031Sdes errx(1, "getaddrinfo: %s", gai_strerror(error)); 614285031Sdes 615285031Sdes res0 = res; 616285031Sdes do { 617285031Sdes if ((s = socket(res0->ai_family, res0->ai_socktype, 618285031Sdes res0->ai_protocol)) < 0) 619285031Sdes continue; 620285031Sdes 621285031Sdes#ifdef SO_RTABLE 622285031Sdes if (rtableid >= 0 && (setsockopt(s, SOL_SOCKET, SO_RTABLE, 623285031Sdes &rtableid, sizeof(rtableid)) == -1)) 624285031Sdes err(1, "setsockopt SO_RTABLE"); 625285031Sdes#endif 626285031Sdes /* Bind to a local port or source address if specified. */ 627285031Sdes if (sflag || pflag) { 628285031Sdes struct addrinfo ahints, *ares; 629285031Sdes 630285031Sdes#ifdef SO_BINDANY 631285031Sdes /* try SO_BINDANY, but don't insist */ 632285031Sdes setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on)); 633285031Sdes#endif 634285031Sdes memset(&ahints, 0, sizeof(struct addrinfo)); 635285031Sdes ahints.ai_family = res0->ai_family; 636285031Sdes ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM; 637285031Sdes ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP; 638285031Sdes ahints.ai_flags = AI_PASSIVE; 639285031Sdes if ((error = getaddrinfo(sflag, pflag, &ahints, &ares))) 640285031Sdes errx(1, "getaddrinfo: %s", gai_strerror(error)); 641285031Sdes 642285031Sdes if (bind(s, (struct sockaddr *)ares->ai_addr, 643285031Sdes ares->ai_addrlen) < 0) 644285031Sdes err(1, "bind failed"); 645285031Sdes freeaddrinfo(ares); 646285031Sdes } 647285031Sdes 648285031Sdes set_common_sockopts(s); 649285031Sdes 650285031Sdes if (timeout_connect(s, res0->ai_addr, res0->ai_addrlen) == 0) 651285031Sdes break; 652285031Sdes else if (vflag) 653285031Sdes warn("connect to %s port %s (%s) failed", host, port, 654285031Sdes uflag ? "udp" : "tcp"); 655285031Sdes 656285031Sdes close(s); 657285031Sdes s = -1; 658285031Sdes } while ((res0 = res0->ai_next) != NULL); 659285031Sdes 660285031Sdes freeaddrinfo(res); 661285031Sdes 662285031Sdes return (s); 663285031Sdes} 664285031Sdes 665285031Sdesint 666285031Sdestimeout_connect(int s, const struct sockaddr *name, socklen_t namelen) 667285031Sdes{ 668285031Sdes struct pollfd pfd; 669285031Sdes socklen_t optlen; 670285031Sdes int flags = 0, optval; 671285031Sdes int ret; 672285031Sdes 673285031Sdes if (timeout != -1) { 674285031Sdes flags = fcntl(s, F_GETFL, 0); 675285031Sdes if (fcntl(s, F_SETFL, flags | O_NONBLOCK) == -1) 676285031Sdes err(1, "set non-blocking mode"); 677285031Sdes } 678285031Sdes 679285031Sdes if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) { 680285031Sdes pfd.fd = s; 681285031Sdes pfd.events = POLLOUT; 682285031Sdes if ((ret = poll(&pfd, 1, timeout)) == 1) { 683285031Sdes optlen = sizeof(optval); 684285031Sdes if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR, 685285031Sdes &optval, &optlen)) == 0) { 686285031Sdes errno = optval; 687285031Sdes ret = optval == 0 ? 0 : -1; 688285031Sdes } 689285031Sdes } else if (ret == 0) { 690285031Sdes errno = ETIMEDOUT; 691285031Sdes ret = -1; 692285031Sdes } else 693285031Sdes err(1, "poll failed"); 694285031Sdes } 695285031Sdes 696285031Sdes if (timeout != -1 && fcntl(s, F_SETFL, flags) == -1) 697285031Sdes err(1, "restoring flags"); 698285031Sdes 699285031Sdes return (ret); 700285031Sdes} 701285031Sdes 702285031Sdes/* 703285031Sdes * local_listen() 704285031Sdes * Returns a socket listening on a local port, binds to specified source 705285031Sdes * address. Returns -1 on failure. 706285031Sdes */ 707285031Sdesint 708285031Sdeslocal_listen(char *host, char *port, struct addrinfo hints) 709285031Sdes{ 710285031Sdes struct addrinfo *res, *res0; 711285031Sdes int s, ret, x = 1; 712285031Sdes int error; 713285031Sdes 714285031Sdes /* Allow nodename to be null. */ 715285031Sdes hints.ai_flags |= AI_PASSIVE; 716285031Sdes 717285031Sdes /* 718285031Sdes * In the case of binding to a wildcard address 719285031Sdes * default to binding to an ipv4 address. 720285031Sdes */ 721285031Sdes if (host == NULL && hints.ai_family == AF_UNSPEC) 722285031Sdes hints.ai_family = AF_INET; 723285031Sdes 724285031Sdes if ((error = getaddrinfo(host, port, &hints, &res))) 725285031Sdes errx(1, "getaddrinfo: %s", gai_strerror(error)); 726285031Sdes 727285031Sdes res0 = res; 728285031Sdes do { 729285031Sdes if ((s = socket(res0->ai_family, res0->ai_socktype, 730285031Sdes res0->ai_protocol)) < 0) 731285031Sdes continue; 732285031Sdes 733285031Sdes#ifdef SO_RTABLE 734285031Sdes if (rtableid >= 0 && (setsockopt(s, SOL_SOCKET, SO_RTABLE, 735285031Sdes &rtableid, sizeof(rtableid)) == -1)) 736285031Sdes err(1, "setsockopt SO_RTABLE"); 737285031Sdes#endif 738285031Sdes#ifdef SO_REUSEPORT 739285031Sdes ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x)); 740285031Sdes if (ret == -1) 741285031Sdes err(1, "setsockopt"); 742285031Sdes#endif 743285031Sdes set_common_sockopts(s); 744285031Sdes 745285031Sdes if (bind(s, (struct sockaddr *)res0->ai_addr, 746285031Sdes res0->ai_addrlen) == 0) 747285031Sdes break; 748285031Sdes 749285031Sdes close(s); 750285031Sdes s = -1; 751285031Sdes } while ((res0 = res0->ai_next) != NULL); 752285031Sdes 753285031Sdes if (!uflag && s != -1) { 754285031Sdes if (listen(s, 1) < 0) 755285031Sdes err(1, "listen"); 756285031Sdes } 757285031Sdes 758285031Sdes freeaddrinfo(res); 759285031Sdes 760285031Sdes return (s); 761285031Sdes} 762285031Sdes 763285031Sdes/* 764285031Sdes * readwrite() 765285031Sdes * Loop that polls on the network file descriptor and stdin. 766285031Sdes */ 767285031Sdesvoid 768285031Sdesreadwrite(int net_fd) 769285031Sdes{ 770285031Sdes struct pollfd pfd[4]; 771285031Sdes int stdin_fd = STDIN_FILENO; 772285031Sdes int stdout_fd = STDOUT_FILENO; 773285031Sdes unsigned char netinbuf[BUFSIZE]; 774285031Sdes size_t netinbufpos = 0; 775285031Sdes unsigned char stdinbuf[BUFSIZE]; 776285031Sdes size_t stdinbufpos = 0; 777285031Sdes int n, num_fds; 778285031Sdes ssize_t ret; 779285031Sdes 780285031Sdes /* don't read from stdin if requested */ 781285031Sdes if (dflag) 782285031Sdes stdin_fd = -1; 783285031Sdes 784285031Sdes /* stdin */ 785285031Sdes pfd[POLL_STDIN].fd = stdin_fd; 786285031Sdes pfd[POLL_STDIN].events = POLLIN; 787285031Sdes 788285031Sdes /* network out */ 789285031Sdes pfd[POLL_NETOUT].fd = net_fd; 790285031Sdes pfd[POLL_NETOUT].events = 0; 791285031Sdes 792285031Sdes /* network in */ 793285031Sdes pfd[POLL_NETIN].fd = net_fd; 794285031Sdes pfd[POLL_NETIN].events = POLLIN; 795285031Sdes 796285031Sdes /* stdout */ 797285031Sdes pfd[POLL_STDOUT].fd = stdout_fd; 798285031Sdes pfd[POLL_STDOUT].events = 0; 799285031Sdes 800285031Sdes while (1) { 801285031Sdes /* both inputs are gone, buffers are empty, we are done */ 802285031Sdes if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 803285031Sdes && stdinbufpos == 0 && netinbufpos == 0) { 804285031Sdes close(net_fd); 805285031Sdes return; 806285031Sdes } 807285031Sdes /* both outputs are gone, we can't continue */ 808285031Sdes if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1) { 809285031Sdes close(net_fd); 810285031Sdes return; 811285031Sdes } 812285031Sdes /* listen and net in gone, queues empty, done */ 813285031Sdes if (lflag && pfd[POLL_NETIN].fd == -1 814285031Sdes && stdinbufpos == 0 && netinbufpos == 0) { 815285031Sdes close(net_fd); 816285031Sdes return; 817285031Sdes } 818285031Sdes 819285031Sdes /* help says -i is for "wait between lines sent". We read and 820285031Sdes * write arbitrary amounts of data, and we don't want to start 821285031Sdes * scanning for newlines, so this is as good as it gets */ 822285031Sdes if (iflag) 823285031Sdes sleep(iflag); 824285031Sdes 825285031Sdes /* poll */ 826285031Sdes num_fds = poll(pfd, 4, timeout); 827285031Sdes 828285031Sdes /* treat poll errors */ 829285031Sdes if (num_fds == -1) { 830285031Sdes close(net_fd); 831285031Sdes err(1, "polling error"); 832285031Sdes } 833285031Sdes 834285031Sdes /* timeout happened */ 835285031Sdes if (num_fds == 0) 836285031Sdes return; 837285031Sdes 838285031Sdes /* treat socket error conditions */ 839285031Sdes for (n = 0; n < 4; n++) { 840285031Sdes if (pfd[n].revents & (POLLERR|POLLNVAL)) { 841285031Sdes pfd[n].fd = -1; 842285031Sdes } 843285031Sdes } 844285031Sdes /* reading is possible after HUP */ 845285031Sdes if (pfd[POLL_STDIN].events & POLLIN && 846285031Sdes pfd[POLL_STDIN].revents & POLLHUP && 847285031Sdes ! (pfd[POLL_STDIN].revents & POLLIN)) 848285031Sdes pfd[POLL_STDIN].fd = -1; 849285031Sdes 850285031Sdes if (pfd[POLL_NETIN].events & POLLIN && 851285031Sdes pfd[POLL_NETIN].revents & POLLHUP && 852285031Sdes ! (pfd[POLL_NETIN].revents & POLLIN)) 853285031Sdes pfd[POLL_NETIN].fd = -1; 854285031Sdes 855285031Sdes if (pfd[POLL_NETOUT].revents & POLLHUP) { 856285031Sdes if (Nflag) 857285031Sdes shutdown(pfd[POLL_NETOUT].fd, SHUT_WR); 858285031Sdes pfd[POLL_NETOUT].fd = -1; 859285031Sdes } 860285031Sdes /* if HUP, stop watching stdout */ 861285031Sdes if (pfd[POLL_STDOUT].revents & POLLHUP) 862285031Sdes pfd[POLL_STDOUT].fd = -1; 863285031Sdes /* if no net out, stop watching stdin */ 864285031Sdes if (pfd[POLL_NETOUT].fd == -1) 865285031Sdes pfd[POLL_STDIN].fd = -1; 866285031Sdes /* if no stdout, stop watching net in */ 867285031Sdes if (pfd[POLL_STDOUT].fd == -1) { 868285031Sdes if (pfd[POLL_NETIN].fd != -1) 869285031Sdes shutdown(pfd[POLL_NETIN].fd, SHUT_RD); 870285031Sdes pfd[POLL_NETIN].fd = -1; 871285031Sdes } 872285031Sdes 873285031Sdes /* try to read from stdin */ 874285031Sdes if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) { 875285031Sdes ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf, 876285031Sdes &stdinbufpos); 877285031Sdes /* error or eof on stdin - remove from pfd */ 878285031Sdes if (ret == 0 || ret == -1) 879285031Sdes pfd[POLL_STDIN].fd = -1; 880285031Sdes /* read something - poll net out */ 881285031Sdes if (stdinbufpos > 0) 882285031Sdes pfd[POLL_NETOUT].events = POLLOUT; 883285031Sdes /* filled buffer - remove self from polling */ 884285031Sdes if (stdinbufpos == BUFSIZE) 885285031Sdes pfd[POLL_STDIN].events = 0; 886285031Sdes } 887285031Sdes /* try to write to network */ 888285031Sdes if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) { 889285031Sdes ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf, 890285031Sdes &stdinbufpos); 891285031Sdes if (ret == -1) 892285031Sdes pfd[POLL_NETOUT].fd = -1; 893285031Sdes /* buffer empty - remove self from polling */ 894285031Sdes if (stdinbufpos == 0) 895285031Sdes pfd[POLL_NETOUT].events = 0; 896285031Sdes /* buffer no longer full - poll stdin again */ 897285031Sdes if (stdinbufpos < BUFSIZE) 898285031Sdes pfd[POLL_STDIN].events = POLLIN; 899285031Sdes } 900285031Sdes /* try to read from network */ 901285031Sdes if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) { 902285031Sdes ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf, 903285031Sdes &netinbufpos); 904285031Sdes if (ret == -1) 905285031Sdes pfd[POLL_NETIN].fd = -1; 906285031Sdes /* eof on net in - remove from pfd */ 907285031Sdes if (ret == 0) { 908285031Sdes shutdown(pfd[POLL_NETIN].fd, SHUT_RD); 909285031Sdes pfd[POLL_NETIN].fd = -1; 910285031Sdes } 911285031Sdes /* read something - poll stdout */ 912285031Sdes if (netinbufpos > 0) 913285031Sdes pfd[POLL_STDOUT].events = POLLOUT; 914285031Sdes /* filled buffer - remove self from polling */ 915285031Sdes if (netinbufpos == BUFSIZE) 916285031Sdes pfd[POLL_NETIN].events = 0; 917285031Sdes /* handle telnet */ 918285031Sdes if (tflag) 919285031Sdes atelnet(pfd[POLL_NETIN].fd, netinbuf, 920285031Sdes netinbufpos); 921285031Sdes } 922285031Sdes /* try to write to stdout */ 923285031Sdes if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) { 924285031Sdes ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf, 925285031Sdes &netinbufpos); 926285031Sdes if (ret == -1) 927285031Sdes pfd[POLL_STDOUT].fd = -1; 928285031Sdes /* buffer empty - remove self from polling */ 929285031Sdes if (netinbufpos == 0) 930285031Sdes pfd[POLL_STDOUT].events = 0; 931285031Sdes /* buffer no longer full - poll net in again */ 932285031Sdes if (netinbufpos < BUFSIZE) 933285031Sdes pfd[POLL_NETIN].events = POLLIN; 934285031Sdes } 935285031Sdes 936285031Sdes /* stdin gone and queue empty? */ 937285031Sdes if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) { 938285031Sdes if (pfd[POLL_NETOUT].fd != -1 && Nflag) 939285031Sdes shutdown(pfd[POLL_NETOUT].fd, SHUT_WR); 940285031Sdes pfd[POLL_NETOUT].fd = -1; 941285031Sdes } 942285031Sdes /* net in gone and queue empty? */ 943285031Sdes if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) { 944285031Sdes pfd[POLL_STDOUT].fd = -1; 945285031Sdes } 946285031Sdes } 947285031Sdes} 948285031Sdes 949285031Sdesssize_t 950285031Sdesdrainbuf(int fd, unsigned char *buf, size_t *bufpos) 951285031Sdes{ 952285031Sdes ssize_t n; 953285031Sdes ssize_t adjust; 954285031Sdes 955285031Sdes n = write(fd, buf, *bufpos); 956285031Sdes /* don't treat EAGAIN, EINTR as error */ 957285031Sdes if (n == -1 && (errno == EAGAIN || errno == EINTR)) 958285031Sdes n = -2; 959285031Sdes if (n <= 0) 960285031Sdes return n; 961285031Sdes /* adjust buffer */ 962285031Sdes adjust = *bufpos - n; 963285031Sdes if (adjust > 0) 964285031Sdes memmove(buf, buf + n, adjust); 965285031Sdes *bufpos -= n; 966285031Sdes return n; 967285031Sdes} 968285031Sdes 969285031Sdes 970285031Sdesssize_t 971285031Sdesfillbuf(int fd, unsigned char *buf, size_t *bufpos) 972285031Sdes{ 973285031Sdes size_t num = BUFSIZE - *bufpos; 974285031Sdes ssize_t n; 975285031Sdes 976285031Sdes n = read(fd, buf + *bufpos, num); 977285031Sdes /* don't treat EAGAIN, EINTR as error */ 978285031Sdes if (n == -1 && (errno == EAGAIN || errno == EINTR)) 979285031Sdes n = -2; 980285031Sdes if (n <= 0) 981285031Sdes return n; 982285031Sdes *bufpos += n; 983285031Sdes return n; 984285031Sdes} 985285031Sdes 986285031Sdes/* 987285031Sdes * fdpass() 988285031Sdes * Pass the connected file descriptor to stdout and exit. 989285031Sdes */ 990285031Sdesvoid 991285031Sdesfdpass(int nfd) 992285031Sdes{ 993285031Sdes#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR)) 994285031Sdes struct msghdr msg; 995285031Sdes#ifndef HAVE_ACCRIGHTS_IN_MSGHDR 996285031Sdes union { 997285031Sdes struct cmsghdr hdr; 998285031Sdes char buf[CMSG_SPACE(sizeof(int))]; 999285031Sdes } cmsgbuf; 1000285031Sdes struct cmsghdr *cmsg; 1001285031Sdes#endif 1002285031Sdes struct iovec vec; 1003285031Sdes char ch = '\0'; 1004285031Sdes struct pollfd pfd; 1005285031Sdes ssize_t r; 1006285031Sdes 1007285031Sdes memset(&msg, 0, sizeof(msg)); 1008285031Sdes#ifdef HAVE_ACCRIGHTS_IN_MSGHDR 1009285031Sdes msg.msg_accrights = (caddr_t)&nfd; 1010285031Sdes msg.msg_accrightslen = sizeof(nfd); 1011285031Sdes#else 1012285031Sdes memset(&cmsgbuf, 0, sizeof(cmsgbuf)); 1013285031Sdes msg.msg_control = (caddr_t)&cmsgbuf.buf; 1014285031Sdes msg.msg_controllen = sizeof(cmsgbuf.buf); 1015285031Sdes cmsg = CMSG_FIRSTHDR(&msg); 1016285031Sdes cmsg->cmsg_len = CMSG_LEN(sizeof(int)); 1017285031Sdes cmsg->cmsg_level = SOL_SOCKET; 1018285031Sdes cmsg->cmsg_type = SCM_RIGHTS; 1019285031Sdes *(int *)CMSG_DATA(cmsg) = nfd; 1020285031Sdes#endif 1021285031Sdes 1022285031Sdes vec.iov_base = &ch; 1023285031Sdes vec.iov_len = 1; 1024285031Sdes msg.msg_iov = &vec; 1025285031Sdes msg.msg_iovlen = 1; 1026285031Sdes 1027285031Sdes bzero(&pfd, sizeof(pfd)); 1028285031Sdes pfd.fd = STDOUT_FILENO; 1029285031Sdes for (;;) { 1030285031Sdes r = sendmsg(STDOUT_FILENO, &msg, 0); 1031285031Sdes if (r == -1) { 1032285031Sdes if (errno == EAGAIN || errno == EINTR) { 1033285031Sdes pfd.events = POLLOUT; 1034285031Sdes if (poll(&pfd, 1, -1) == -1) 1035285031Sdes err(1, "poll"); 1036285031Sdes continue; 1037285031Sdes } 1038285031Sdes err(1, "sendmsg"); 1039285031Sdes } else if (r == -1) 1040285031Sdes errx(1, "sendmsg: unexpected return value %zd", r); 1041285031Sdes else 1042285031Sdes break; 1043285031Sdes } 1044285031Sdes exit(0); 1045285031Sdes#else 1046285031Sdes errx(1, "%s: file descriptor passing not supported", __func__); 1047285031Sdes#endif 1048285031Sdes} 1049285031Sdes 1050285031Sdes/* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */ 1051285031Sdesvoid 1052285031Sdesatelnet(int nfd, unsigned char *buf, unsigned int size) 1053285031Sdes{ 1054285031Sdes unsigned char *p, *end; 1055285031Sdes unsigned char obuf[4]; 1056285031Sdes 1057285031Sdes if (size < 3) 1058285031Sdes return; 1059285031Sdes end = buf + size - 2; 1060285031Sdes 1061285031Sdes for (p = buf; p < end; p++) { 1062285031Sdes if (*p != IAC) 1063285031Sdes continue; 1064285031Sdes 1065285031Sdes obuf[0] = IAC; 1066285031Sdes p++; 1067285031Sdes if ((*p == WILL) || (*p == WONT)) 1068285031Sdes obuf[1] = DONT; 1069285031Sdes else if ((*p == DO) || (*p == DONT)) 1070285031Sdes obuf[1] = WONT; 1071285031Sdes else 1072285031Sdes continue; 1073285031Sdes 1074285031Sdes p++; 1075285031Sdes obuf[2] = *p; 1076285031Sdes if (atomicio(vwrite, nfd, obuf, 3) != 3) 1077285031Sdes warn("Write Error!"); 1078285031Sdes } 1079285031Sdes} 1080285031Sdes 1081285031Sdes/* 1082285031Sdes * build_ports() 1083285031Sdes * Build an array of ports in portlist[], listing each port 1084285031Sdes * that we should try to connect to. 1085285031Sdes */ 1086285031Sdesvoid 1087285031Sdesbuild_ports(char *p) 1088285031Sdes{ 1089285031Sdes const char *errstr; 1090285031Sdes char *n; 1091285031Sdes int hi, lo, cp; 1092285031Sdes int x = 0; 1093285031Sdes 1094285031Sdes if ((n = strchr(p, '-')) != NULL) { 1095285031Sdes *n = '\0'; 1096285031Sdes n++; 1097285031Sdes 1098285031Sdes /* Make sure the ports are in order: lowest->highest. */ 1099285031Sdes hi = strtonum(n, 1, PORT_MAX, &errstr); 1100285031Sdes if (errstr) 1101285031Sdes errx(1, "port number %s: %s", errstr, n); 1102285031Sdes lo = strtonum(p, 1, PORT_MAX, &errstr); 1103285031Sdes if (errstr) 1104285031Sdes errx(1, "port number %s: %s", errstr, p); 1105285031Sdes 1106285031Sdes if (lo > hi) { 1107285031Sdes cp = hi; 1108285031Sdes hi = lo; 1109285031Sdes lo = cp; 1110285031Sdes } 1111285031Sdes 1112285031Sdes /* Load ports sequentially. */ 1113285031Sdes for (cp = lo; cp <= hi; cp++) { 1114285031Sdes portlist[x] = calloc(1, PORT_MAX_LEN); 1115285031Sdes if (portlist[x] == NULL) 1116285031Sdes errx(1, "calloc"); 1117285031Sdes snprintf(portlist[x], PORT_MAX_LEN, "%d", cp); 1118285031Sdes x++; 1119285031Sdes } 1120285031Sdes 1121285031Sdes /* Randomly swap ports. */ 1122285031Sdes if (rflag) { 1123285031Sdes int y; 1124285031Sdes char *c; 1125285031Sdes 1126285031Sdes for (x = 0; x <= (hi - lo); x++) { 1127285031Sdes y = (arc4random() & 0xFFFF) % (hi - lo); 1128285031Sdes c = portlist[x]; 1129285031Sdes portlist[x] = portlist[y]; 1130285031Sdes portlist[y] = c; 1131285031Sdes } 1132285031Sdes } 1133285031Sdes } else { 1134285031Sdes hi = strtonum(p, 1, PORT_MAX, &errstr); 1135285031Sdes if (errstr) 1136285031Sdes errx(1, "port number %s: %s", errstr, p); 1137285031Sdes portlist[0] = strdup(p); 1138285031Sdes if (portlist[0] == NULL) 1139285031Sdes errx(1, "strdup"); 1140285031Sdes } 1141285031Sdes} 1142285031Sdes 1143285031Sdes/* 1144285031Sdes * udptest() 1145285031Sdes * Do a few writes to see if the UDP port is there. 1146285031Sdes * Fails once PF state table is full. 1147285031Sdes */ 1148285031Sdesint 1149285031Sdesudptest(int s) 1150285031Sdes{ 1151285031Sdes int i, ret; 1152285031Sdes 1153285031Sdes for (i = 0; i <= 3; i++) { 1154285031Sdes if (write(s, "X", 1) == 1) 1155285031Sdes ret = 1; 1156285031Sdes else 1157285031Sdes ret = -1; 1158285031Sdes } 1159285031Sdes return (ret); 1160285031Sdes} 1161285031Sdes 1162285031Sdesvoid 1163285031Sdesset_common_sockopts(int s) 1164285031Sdes{ 1165285031Sdes int x = 1; 1166285031Sdes 1167285031Sdes#ifdef TCP_MD5SIG 1168285031Sdes if (Sflag) { 1169285031Sdes if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG, 1170285031Sdes &x, sizeof(x)) == -1) 1171285031Sdes err(1, "setsockopt"); 1172285031Sdes } 1173285031Sdes#endif 1174285031Sdes if (Dflag) { 1175285031Sdes if (setsockopt(s, SOL_SOCKET, SO_DEBUG, 1176285031Sdes &x, sizeof(x)) == -1) 1177285031Sdes err(1, "setsockopt"); 1178285031Sdes } 1179285031Sdes if (Tflag != -1) { 1180285031Sdes if (setsockopt(s, IPPROTO_IP, IP_TOS, 1181285031Sdes &Tflag, sizeof(Tflag)) == -1) 1182285031Sdes err(1, "set IP ToS"); 1183285031Sdes } 1184285031Sdes if (Iflag) { 1185285031Sdes if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, 1186285031Sdes &Iflag, sizeof(Iflag)) == -1) 1187285031Sdes err(1, "set TCP receive buffer size"); 1188285031Sdes } 1189285031Sdes if (Oflag) { 1190285031Sdes if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, 1191285031Sdes &Oflag, sizeof(Oflag)) == -1) 1192285031Sdes err(1, "set TCP send buffer size"); 1193285031Sdes } 1194285031Sdes} 1195285031Sdes 1196285031Sdesint 1197285031Sdesmap_tos(char *s, int *val) 1198285031Sdes{ 1199285031Sdes /* DiffServ Codepoints and other TOS mappings */ 1200285031Sdes const struct toskeywords { 1201285031Sdes const char *keyword; 1202285031Sdes int val; 1203285031Sdes } *t, toskeywords[] = { 1204285031Sdes { "af11", IPTOS_DSCP_AF11 }, 1205285031Sdes { "af12", IPTOS_DSCP_AF12 }, 1206285031Sdes { "af13", IPTOS_DSCP_AF13 }, 1207285031Sdes { "af21", IPTOS_DSCP_AF21 }, 1208285031Sdes { "af22", IPTOS_DSCP_AF22 }, 1209285031Sdes { "af23", IPTOS_DSCP_AF23 }, 1210285031Sdes { "af31", IPTOS_DSCP_AF31 }, 1211285031Sdes { "af32", IPTOS_DSCP_AF32 }, 1212285031Sdes { "af33", IPTOS_DSCP_AF33 }, 1213285031Sdes { "af41", IPTOS_DSCP_AF41 }, 1214285031Sdes { "af42", IPTOS_DSCP_AF42 }, 1215285031Sdes { "af43", IPTOS_DSCP_AF43 }, 1216285031Sdes { "critical", IPTOS_PREC_CRITIC_ECP }, 1217285031Sdes { "cs0", IPTOS_DSCP_CS0 }, 1218285031Sdes { "cs1", IPTOS_DSCP_CS1 }, 1219285031Sdes { "cs2", IPTOS_DSCP_CS2 }, 1220285031Sdes { "cs3", IPTOS_DSCP_CS3 }, 1221285031Sdes { "cs4", IPTOS_DSCP_CS4 }, 1222285031Sdes { "cs5", IPTOS_DSCP_CS5 }, 1223285031Sdes { "cs6", IPTOS_DSCP_CS6 }, 1224285031Sdes { "cs7", IPTOS_DSCP_CS7 }, 1225285031Sdes { "ef", IPTOS_DSCP_EF }, 1226285031Sdes { "inetcontrol", IPTOS_PREC_INTERNETCONTROL }, 1227285031Sdes { "lowdelay", IPTOS_LOWDELAY }, 1228285031Sdes { "netcontrol", IPTOS_PREC_NETCONTROL }, 1229285031Sdes { "reliability", IPTOS_RELIABILITY }, 1230285031Sdes { "throughput", IPTOS_THROUGHPUT }, 1231285031Sdes { NULL, -1 }, 1232285031Sdes }; 1233285031Sdes 1234285031Sdes for (t = toskeywords; t->keyword != NULL; t++) { 1235285031Sdes if (strcmp(s, t->keyword) == 0) { 1236285031Sdes *val = t->val; 1237285031Sdes return (1); 1238285031Sdes } 1239285031Sdes } 1240285031Sdes 1241285031Sdes return (0); 1242285031Sdes} 1243285031Sdes 1244285031Sdesvoid 1245285031Sdesreport_connect(const struct sockaddr *sa, socklen_t salen) 1246285031Sdes{ 1247285031Sdes char remote_host[NI_MAXHOST]; 1248285031Sdes char remote_port[NI_MAXSERV]; 1249285031Sdes int herr; 1250285031Sdes int flags = NI_NUMERICSERV; 1251285031Sdes 1252285031Sdes if (nflag) 1253285031Sdes flags |= NI_NUMERICHOST; 1254285031Sdes 1255285031Sdes if ((herr = getnameinfo(sa, salen, 1256285031Sdes remote_host, sizeof(remote_host), 1257285031Sdes remote_port, sizeof(remote_port), 1258285031Sdes flags)) != 0) { 1259285031Sdes if (herr == EAI_SYSTEM) 1260285031Sdes err(1, "getnameinfo"); 1261285031Sdes else 1262285031Sdes errx(1, "getnameinfo: %s", gai_strerror(herr)); 1263285031Sdes } 1264285031Sdes 1265285031Sdes fprintf(stderr, 1266285031Sdes "Connection from %s %s " 1267285031Sdes "received!\n", remote_host, remote_port); 1268285031Sdes} 1269285031Sdes 1270285031Sdesvoid 1271285031Sdeshelp(void) 1272285031Sdes{ 1273285031Sdes usage(0); 1274285031Sdes fprintf(stderr, "\tCommand Summary:\n\ 1275285031Sdes \t-4 Use IPv4\n\ 1276285031Sdes \t-6 Use IPv6\n\ 1277285031Sdes \t-D Enable the debug socket option\n\ 1278285031Sdes \t-d Detach from stdin\n\ 1279285031Sdes \t-F Pass socket fd\n\ 1280285031Sdes \t-h This help text\n\ 1281285031Sdes \t-I length TCP receive buffer length\n\ 1282285031Sdes \t-i secs\t Delay interval for lines sent, ports scanned\n\ 1283285031Sdes \t-k Keep inbound sockets open for multiple connects\n\ 1284285031Sdes \t-l Listen mode, for inbound connects\n\ 1285285031Sdes \t-N Shutdown the network socket after EOF on stdin\n\ 1286285031Sdes \t-n Suppress name/port resolutions\n\ 1287285031Sdes \t-O length TCP send buffer length\n\ 1288285031Sdes \t-P proxyuser\tUsername for proxy authentication\n\ 1289285031Sdes \t-p port\t Specify local port for remote connects\n\ 1290285031Sdes \t-r Randomize remote ports\n\ 1291285031Sdes \t-S Enable the TCP MD5 signature option\n\ 1292285031Sdes \t-s addr\t Local source address\n\ 1293285031Sdes \t-T toskeyword\tSet IP Type of Service\n\ 1294285031Sdes \t-t Answer TELNET negotiation\n\ 1295285031Sdes \t-U Use UNIX domain socket\n\ 1296285031Sdes \t-u UDP mode\n\ 1297285031Sdes \t-V rtable Specify alternate routing table\n\ 1298285031Sdes \t-v Verbose\n\ 1299285031Sdes \t-w secs\t Timeout for connects and final net reads\n\ 1300285031Sdes \t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\ 1301285031Sdes \t-x addr[:port]\tSpecify proxy address and port\n\ 1302285031Sdes \t-z Zero-I/O mode [used for scanning]\n\ 1303285031Sdes Port numbers can be individual or ranges: lo-hi [inclusive]\n"); 1304285031Sdes exit(1); 1305285031Sdes} 1306285031Sdes 1307285031Sdesvoid 1308285031Sdesusage(int ret) 1309285031Sdes{ 1310285031Sdes fprintf(stderr, 1311285031Sdes "usage: nc [-46DdFhklNnrStUuvz] [-I length] [-i interval] [-O length]\n" 1312285031Sdes "\t [-P proxy_username] [-p source_port] [-s source] [-T ToS]\n" 1313285031Sdes "\t [-V rtable] [-w timeout] [-X proxy_protocol]\n" 1314285031Sdes "\t [-x proxy_address[:port]] [destination] [port]\n"); 1315285031Sdes if (ret) 1316285031Sdes exit(1); 1317285031Sdes} 1318285031Sdes 1319285031Sdes/* *** src/usr.bin/nc/socks.c *** */ 1320285031Sdes 1321285031Sdes 1322285031Sdes/* $OpenBSD: socks.c,v 1.20 2012/03/08 09:56:28 espie Exp $ */ 1323285031Sdes 1324285031Sdes/* 1325285031Sdes * Copyright (c) 1999 Niklas Hallqvist. All rights reserved. 1326285031Sdes * Copyright (c) 2004, 2005 Damien Miller. All rights reserved. 1327285031Sdes * 1328285031Sdes * Redistribution and use in source and binary forms, with or without 1329285031Sdes * modification, are permitted provided that the following conditions 1330285031Sdes * are met: 1331285031Sdes * 1. Redistributions of source code must retain the above copyright 1332285031Sdes * notice, this list of conditions and the following disclaimer. 1333285031Sdes * 2. Redistributions in binary form must reproduce the above copyright 1334285031Sdes * notice, this list of conditions and the following disclaimer in the 1335285031Sdes * documentation and/or other materials provided with the distribution. 1336285031Sdes * 1337285031Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1338285031Sdes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1339285031Sdes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 1340285031Sdes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 1341285031Sdes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 1342285031Sdes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 1343285031Sdes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 1344285031Sdes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 1345285031Sdes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 1346285031Sdes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 1347285031Sdes */ 1348285031Sdes 1349285031Sdes#include <sys/types.h> 1350285031Sdes#include <sys/socket.h> 1351285031Sdes#include <netinet/in.h> 1352285031Sdes#include <arpa/inet.h> 1353285031Sdes 1354285031Sdes#include <errno.h> 1355285031Sdes#include <netdb.h> 1356285031Sdes#include <stdio.h> 1357285031Sdes#include <stdlib.h> 1358285031Sdes#include <string.h> 1359285031Sdes#include <unistd.h> 1360285031Sdes#include <resolv.h> 1361285031Sdes 1362285031Sdes#define SOCKS_PORT "1080" 1363285031Sdes#define HTTP_PROXY_PORT "3128" 1364285031Sdes#define HTTP_MAXHDRS 64 1365285031Sdes#define SOCKS_V5 5 1366285031Sdes#define SOCKS_V4 4 1367285031Sdes#define SOCKS_NOAUTH 0 1368285031Sdes#define SOCKS_NOMETHOD 0xff 1369285031Sdes#define SOCKS_CONNECT 1 1370285031Sdes#define SOCKS_IPV4 1 1371285031Sdes#define SOCKS_DOMAIN 3 1372285031Sdes#define SOCKS_IPV6 4 1373285031Sdes 1374285031Sdesint remote_connect(const char *, const char *, struct addrinfo); 1375285031Sdesint socks_connect(const char *, const char *, struct addrinfo, 1376285031Sdes const char *, const char *, struct addrinfo, int, 1377285031Sdes const char *); 1378285031Sdes 1379285031Sdesstatic int 1380285031Sdesdecode_addrport(const char *h, const char *p, struct sockaddr *addr, 1381285031Sdes socklen_t addrlen, int v4only, int numeric) 1382285031Sdes{ 1383285031Sdes int r; 1384285031Sdes struct addrinfo hints, *res; 1385285031Sdes 1386285031Sdes bzero(&hints, sizeof(hints)); 1387285031Sdes hints.ai_family = v4only ? PF_INET : PF_UNSPEC; 1388285031Sdes hints.ai_flags = numeric ? AI_NUMERICHOST : 0; 1389285031Sdes hints.ai_socktype = SOCK_STREAM; 1390285031Sdes r = getaddrinfo(h, p, &hints, &res); 1391285031Sdes /* Don't fatal when attempting to convert a numeric address */ 1392285031Sdes if (r != 0) { 1393285031Sdes if (!numeric) { 1394285031Sdes errx(1, "getaddrinfo(\"%.64s\", \"%.64s\"): %s", h, p, 1395285031Sdes gai_strerror(r)); 1396285031Sdes } 1397285031Sdes return (-1); 1398285031Sdes } 1399285031Sdes if (addrlen < res->ai_addrlen) { 1400285031Sdes freeaddrinfo(res); 1401285031Sdes errx(1, "internal error: addrlen < res->ai_addrlen"); 1402285031Sdes } 1403285031Sdes memcpy(addr, res->ai_addr, res->ai_addrlen); 1404285031Sdes freeaddrinfo(res); 1405285031Sdes return (0); 1406285031Sdes} 1407285031Sdes 1408285031Sdesstatic int 1409285031Sdesproxy_read_line(int fd, char *buf, size_t bufsz) 1410285031Sdes{ 1411285031Sdes size_t off; 1412285031Sdes 1413285031Sdes for(off = 0;;) { 1414285031Sdes if (off >= bufsz) 1415285031Sdes errx(1, "proxy read too long"); 1416285031Sdes if (atomicio(read, fd, buf + off, 1) != 1) 1417285031Sdes err(1, "proxy read"); 1418285031Sdes /* Skip CR */ 1419285031Sdes if (buf[off] == '\r') 1420285031Sdes continue; 1421285031Sdes if (buf[off] == '\n') { 1422285031Sdes buf[off] = '\0'; 1423285031Sdes break; 1424285031Sdes } 1425285031Sdes off++; 1426285031Sdes } 1427285031Sdes return (off); 1428285031Sdes} 1429285031Sdes 1430285031Sdesstatic const char * 1431285031Sdesgetproxypass(const char *proxyuser, const char *proxyhost) 1432285031Sdes{ 1433285031Sdes char prompt[512]; 1434285031Sdes static char pw[256]; 1435285031Sdes 1436285031Sdes snprintf(prompt, sizeof(prompt), "Proxy password for %s@%s: ", 1437285031Sdes proxyuser, proxyhost); 1438285031Sdes if (readpassphrase(prompt, pw, sizeof(pw), RPP_REQUIRE_TTY) == NULL) 1439285031Sdes errx(1, "Unable to read proxy passphrase"); 1440285031Sdes return (pw); 1441285031Sdes} 1442285031Sdes 1443285031Sdesint 1444285031Sdessocks_connect(const char *host, const char *port, 1445285031Sdes struct addrinfo hints __attribute__ ((__unused__)), 1446285031Sdes const char *proxyhost, const char *proxyport, struct addrinfo proxyhints, 1447285031Sdes int socksv, const char *proxyuser) 1448285031Sdes{ 1449285031Sdes int proxyfd, r, authretry = 0; 1450285031Sdes size_t hlen, wlen = 0; 1451285031Sdes unsigned char buf[1024]; 1452285031Sdes size_t cnt; 1453285031Sdes struct sockaddr_storage addr; 1454285031Sdes struct sockaddr_in *in4 = (struct sockaddr_in *)&addr; 1455285031Sdes struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&addr; 1456285031Sdes in_port_t serverport; 1457285031Sdes const char *proxypass = NULL; 1458285031Sdes 1459285031Sdes if (proxyport == NULL) 1460285031Sdes proxyport = (socksv == -1) ? HTTP_PROXY_PORT : SOCKS_PORT; 1461285031Sdes 1462285031Sdes /* Abuse API to lookup port */ 1463285031Sdes if (decode_addrport("0.0.0.0", port, (struct sockaddr *)&addr, 1464285031Sdes sizeof(addr), 1, 1) == -1) 1465285031Sdes errx(1, "unknown port \"%.64s\"", port); 1466285031Sdes serverport = in4->sin_port; 1467285031Sdes 1468285031Sdes again: 1469285031Sdes if (authretry++ > 3) 1470285031Sdes errx(1, "Too many authentication failures"); 1471285031Sdes 1472285031Sdes proxyfd = remote_connect(proxyhost, proxyport, proxyhints); 1473285031Sdes 1474285031Sdes if (proxyfd < 0) 1475285031Sdes return (-1); 1476285031Sdes 1477285031Sdes if (socksv == 5) { 1478285031Sdes if (decode_addrport(host, port, (struct sockaddr *)&addr, 1479285031Sdes sizeof(addr), 0, 1) == -1) 1480285031Sdes addr.ss_family = 0; /* used in switch below */ 1481285031Sdes 1482285031Sdes /* Version 5, one method: no authentication */ 1483285031Sdes buf[0] = SOCKS_V5; 1484285031Sdes buf[1] = 1; 1485285031Sdes buf[2] = SOCKS_NOAUTH; 1486285031Sdes cnt = atomicio(vwrite, proxyfd, buf, 3); 1487285031Sdes if (cnt != 3) 1488285031Sdes err(1, "write failed (%zu/3)", cnt); 1489285031Sdes 1490285031Sdes cnt = atomicio(read, proxyfd, buf, 2); 1491285031Sdes if (cnt != 2) 1492285031Sdes err(1, "read failed (%zu/3)", cnt); 1493285031Sdes 1494285031Sdes if (buf[1] == SOCKS_NOMETHOD) 1495285031Sdes errx(1, "authentication method negotiation failed"); 1496285031Sdes 1497285031Sdes switch (addr.ss_family) { 1498285031Sdes case 0: 1499285031Sdes /* Version 5, connect: domain name */ 1500285031Sdes 1501285031Sdes /* Max domain name length is 255 bytes */ 1502285031Sdes hlen = strlen(host); 1503285031Sdes if (hlen > 255) 1504285031Sdes errx(1, "host name too long for SOCKS5"); 1505285031Sdes buf[0] = SOCKS_V5; 1506285031Sdes buf[1] = SOCKS_CONNECT; 1507285031Sdes buf[2] = 0; 1508285031Sdes buf[3] = SOCKS_DOMAIN; 1509285031Sdes buf[4] = hlen; 1510285031Sdes memcpy(buf + 5, host, hlen); 1511285031Sdes memcpy(buf + 5 + hlen, &serverport, sizeof serverport); 1512285031Sdes wlen = 7 + hlen; 1513285031Sdes break; 1514285031Sdes case AF_INET: 1515285031Sdes /* Version 5, connect: IPv4 address */ 1516285031Sdes buf[0] = SOCKS_V5; 1517285031Sdes buf[1] = SOCKS_CONNECT; 1518285031Sdes buf[2] = 0; 1519285031Sdes buf[3] = SOCKS_IPV4; 1520285031Sdes memcpy(buf + 4, &in4->sin_addr, sizeof in4->sin_addr); 1521285031Sdes memcpy(buf + 8, &in4->sin_port, sizeof in4->sin_port); 1522285031Sdes wlen = 10; 1523285031Sdes break; 1524285031Sdes case AF_INET6: 1525285031Sdes /* Version 5, connect: IPv6 address */ 1526285031Sdes buf[0] = SOCKS_V5; 1527285031Sdes buf[1] = SOCKS_CONNECT; 1528285031Sdes buf[2] = 0; 1529285031Sdes buf[3] = SOCKS_IPV6; 1530285031Sdes memcpy(buf + 4, &in6->sin6_addr, sizeof in6->sin6_addr); 1531285031Sdes memcpy(buf + 20, &in6->sin6_port, 1532285031Sdes sizeof in6->sin6_port); 1533285031Sdes wlen = 22; 1534285031Sdes break; 1535285031Sdes default: 1536285031Sdes errx(1, "internal error: silly AF"); 1537285031Sdes } 1538285031Sdes 1539285031Sdes cnt = atomicio(vwrite, proxyfd, buf, wlen); 1540285031Sdes if (cnt != wlen) 1541285031Sdes err(1, "write failed (%zu/%zu)", cnt, wlen); 1542285031Sdes 1543285031Sdes cnt = atomicio(read, proxyfd, buf, 4); 1544285031Sdes if (cnt != 4) 1545285031Sdes err(1, "read failed (%zu/4)", cnt); 1546285031Sdes if (buf[1] != 0) 1547285031Sdes errx(1, "connection failed, SOCKS error %d", buf[1]); 1548285031Sdes switch (buf[3]) { 1549285031Sdes case SOCKS_IPV4: 1550285031Sdes cnt = atomicio(read, proxyfd, buf + 4, 6); 1551285031Sdes if (cnt != 6) 1552285031Sdes err(1, "read failed (%zu/6)", cnt); 1553285031Sdes break; 1554285031Sdes case SOCKS_IPV6: 1555285031Sdes cnt = atomicio(read, proxyfd, buf + 4, 18); 1556285031Sdes if (cnt != 18) 1557285031Sdes err(1, "read failed (%zu/18)", cnt); 1558285031Sdes break; 1559285031Sdes default: 1560285031Sdes errx(1, "connection failed, unsupported address type"); 1561285031Sdes } 1562285031Sdes } else if (socksv == 4) { 1563285031Sdes /* This will exit on lookup failure */ 1564285031Sdes decode_addrport(host, port, (struct sockaddr *)&addr, 1565285031Sdes sizeof(addr), 1, 0); 1566285031Sdes 1567285031Sdes /* Version 4 */ 1568285031Sdes buf[0] = SOCKS_V4; 1569285031Sdes buf[1] = SOCKS_CONNECT; /* connect */ 1570285031Sdes memcpy(buf + 2, &in4->sin_port, sizeof in4->sin_port); 1571285031Sdes memcpy(buf + 4, &in4->sin_addr, sizeof in4->sin_addr); 1572285031Sdes buf[8] = 0; /* empty username */ 1573285031Sdes wlen = 9; 1574285031Sdes 1575285031Sdes cnt = atomicio(vwrite, proxyfd, buf, wlen); 1576285031Sdes if (cnt != wlen) 1577285031Sdes err(1, "write failed (%zu/%zu)", cnt, wlen); 1578285031Sdes 1579285031Sdes cnt = atomicio(read, proxyfd, buf, 8); 1580285031Sdes if (cnt != 8) 1581285031Sdes err(1, "read failed (%zu/8)", cnt); 1582285031Sdes if (buf[1] != 90) 1583285031Sdes errx(1, "connection failed, SOCKS error %d", buf[1]); 1584285031Sdes } else if (socksv == -1) { 1585285031Sdes /* HTTP proxy CONNECT */ 1586285031Sdes 1587285031Sdes /* Disallow bad chars in hostname */ 1588285031Sdes if (strcspn(host, "\r\n\t []:") != strlen(host)) 1589285031Sdes errx(1, "Invalid hostname"); 1590285031Sdes 1591285031Sdes /* Try to be sane about numeric IPv6 addresses */ 1592285031Sdes if (strchr(host, ':') != NULL) { 1593285031Sdes r = snprintf(buf, sizeof(buf), 1594285031Sdes "CONNECT [%s]:%d HTTP/1.0\r\n", 1595285031Sdes host, ntohs(serverport)); 1596285031Sdes } else { 1597285031Sdes r = snprintf(buf, sizeof(buf), 1598285031Sdes "CONNECT %s:%d HTTP/1.0\r\n", 1599285031Sdes host, ntohs(serverport)); 1600285031Sdes } 1601285031Sdes if (r == -1 || (size_t)r >= sizeof(buf)) 1602285031Sdes errx(1, "hostname too long"); 1603285031Sdes r = strlen(buf); 1604285031Sdes 1605285031Sdes cnt = atomicio(vwrite, proxyfd, buf, r); 1606285031Sdes if (cnt != (size_t)r) 1607285031Sdes err(1, "write failed (%zu/%d)", cnt, r); 1608285031Sdes 1609285031Sdes if (authretry > 1) { 1610285031Sdes char resp[1024]; 1611285031Sdes 1612285031Sdes proxypass = getproxypass(proxyuser, proxyhost); 1613285031Sdes r = snprintf(buf, sizeof(buf), "%s:%s", 1614285031Sdes proxyuser, proxypass); 1615285031Sdes if (r == -1 || (size_t)r >= sizeof(buf) || 1616285031Sdes b64_ntop(buf, strlen(buf), resp, 1617285031Sdes sizeof(resp)) == -1) 1618285031Sdes errx(1, "Proxy username/password too long"); 1619285031Sdes r = snprintf(buf, sizeof(buf), "Proxy-Authorization: " 1620285031Sdes "Basic %s\r\n", resp); 1621285031Sdes if (r == -1 || (size_t)r >= sizeof(buf)) 1622285031Sdes errx(1, "Proxy auth response too long"); 1623285031Sdes r = strlen(buf); 1624285031Sdes if ((cnt = atomicio(vwrite, proxyfd, buf, r)) != (size_t)r) 1625285031Sdes err(1, "write failed (%zu/%d)", cnt, r); 1626285031Sdes } 1627285031Sdes 1628285031Sdes /* Terminate headers */ 1629285031Sdes if ((r = atomicio(vwrite, proxyfd, "\r\n", 2)) != 2) 1630285031Sdes err(1, "write failed (2/%d)", r); 1631285031Sdes 1632285031Sdes /* Read status reply */ 1633285031Sdes proxy_read_line(proxyfd, buf, sizeof(buf)); 1634285031Sdes if (proxyuser != NULL && 1635285031Sdes strncmp(buf, "HTTP/1.0 407 ", 12) == 0) { 1636285031Sdes if (authretry > 1) { 1637285031Sdes fprintf(stderr, "Proxy authentication " 1638285031Sdes "failed\n"); 1639285031Sdes } 1640285031Sdes close(proxyfd); 1641285031Sdes goto again; 1642285031Sdes } else if (strncmp(buf, "HTTP/1.0 200 ", 12) != 0 && 1643285031Sdes strncmp(buf, "HTTP/1.1 200 ", 12) != 0) 1644285031Sdes errx(1, "Proxy error: \"%s\"", buf); 1645285031Sdes 1646285031Sdes /* Headers continue until we hit an empty line */ 1647285031Sdes for (r = 0; r < HTTP_MAXHDRS; r++) { 1648285031Sdes proxy_read_line(proxyfd, buf, sizeof(buf)); 1649285031Sdes if (*buf == '\0') 1650285031Sdes break; 1651285031Sdes } 1652285031Sdes if (*buf != '\0') 1653285031Sdes errx(1, "Too many proxy headers received"); 1654285031Sdes } else 1655285031Sdes errx(1, "Unknown proxy protocol %d", socksv); 1656285031Sdes 1657285031Sdes return (proxyfd); 1658285031Sdes} 1659285031Sdes 1660