/* $OpenBSD: netcat.c,v 1.172 2017/02/05 01:39:14 jca Exp $ */ /* * Copyright (c) 2001 Eric Jackson * Copyright (c) 2015 Bob Beck. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __RCSID("$NetBSD: netcat.c,v 1.7 2023/06/20 08:51:24 rin Exp $"); /* * Re-written nc(1) for OpenBSD. Original implementation by * *Hobbit* . */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CRYPTO #include #else #define TLS_WANT_POLLIN -2 #define TLS_WANT_POLLOUT -2 #endif #include "atomicio.h" #ifdef __NetBSD__ #define accept4(a, b, c, d) paccept((a), (b), (c), NULL, (d)) #endif #define PORT_MAX 65535 #define UNIX_DG_TMP_SOCKET_SIZE 19 #define POLL_STDIN 0 #define POLL_NETOUT 1 #define POLL_NETIN 2 #define POLL_STDOUT 3 #define BUFSIZE 16384 #define DEFAULT_CA_FILE "/etc/ssl/cert.pem" #define TLS_ALL (1 << 1) #define TLS_NOVERIFY (1 << 2) #define TLS_NONAME (1 << 3) #define TLS_CCERT (1 << 4) #define TLS_MUSTSTAPLE (1 << 5) /* Command Line Options */ int dflag; /* detached, no stdin */ int Fflag; /* fdpass sock to stdout */ unsigned int iflag; /* Interval Flag */ int kflag; /* More than one connect */ int lflag; /* Bind to local port */ int Nflag; /* shutdown() network socket */ int nflag; /* Don't do name look up */ char *Pflag; /* Proxy username */ char *pflag; /* Localport flag */ int rflag; /* Random ports flag */ char *sflag; /* Source Address */ int tflag; /* Telnet Emulation */ int uflag; /* UDP - Default to TCP */ int vflag; /* Verbosity */ int xflag; /* Socks proxy */ int zflag; /* Port Scan Flag */ int Dflag; /* sodebug */ int Iflag; /* TCP receive buffer size */ int Oflag; /* TCP send buffer size */ int Sflag; /* TCP MD5 signature option */ int Tflag = -1; /* IP Type of Service */ #ifdef __OpenBSD__ int rtableid = -1; #endif int usetls; /* use TLS */ char *Cflag; /* Public cert file */ char *Kflag; /* Private key file */ char *oflag; /* OCSP stapling file */ const char *Rflag = DEFAULT_CA_FILE; /* Root CA file */ int tls_cachanged; /* Using non-default CA file */ int TLSopt; /* TLS options */ char *tls_expectname; /* required name in peer cert */ char *tls_expecthash; /* required hash of peer cert */ int timeout = -1; int family = AF_UNSPEC; char *portlist[PORT_MAX+1]; char *unix_dg_tmp_socket; int ttl = -1; int minttl = -1; void atelnet(int, unsigned char *, unsigned int); void build_ports(char *); static void help(void) __dead; int local_listen(char *, char *, struct addrinfo); struct tls; void readwrite(int, struct tls *); void fdpass(int nfd) __dead; int remote_connect(const char *, const char *, struct addrinfo); int timeout_connect(int, const struct sockaddr *, socklen_t); int socks_connect(const char *, const char *, struct addrinfo, const char *, const char *, struct addrinfo, int, const char *); int udptest(int); int unix_bind(char *, int); int unix_connect(char *); int unix_listen(char *); void set_common_sockopts(int, int); int map_tos(char *, int *); int map_tls(char *, int *); void report_connect(const struct sockaddr *, socklen_t, char *); void report_tls(struct tls *tls_ctx, char * host, char *tlsexpectname); void usage(int); ssize_t drainbuf(int, unsigned char *, size_t *, struct tls *); ssize_t fillbuf(int, unsigned char *, size_t *, struct tls *); void tls_setup_client(struct tls *, int, char *); struct tls *tls_setup_server(struct tls *, int, char *); int main(int argc, char *argv[]) { int ch, s = -1, ret, socksv; char *host, *uport; struct addrinfo hints; struct servent *sv; socklen_t len; struct sockaddr_storage cliaddr; char *proxy = NULL, *proxyport = NULL; int errnum; struct addrinfo proxyhints; char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE]; #ifdef CRYPTO struct tls_config *tls_cfg = NULL; struct tls *tls_ctx = NULL; #endif ret = 1; socksv = 5; host = NULL; uport = NULL; sv = NULL; signal(SIGPIPE, SIG_IGN); while ((ch = getopt(argc, argv, #ifdef CRYPTO "46C:cDde:FH:hI:i:K:klM:m:NnO:o:P:p:R:rSs:T:tUuV:vw:X:x:z" #else "46Dde:FhI:i:klM:m:NnO:P:p:rSs:tUuvw:X:x:z" #endif )) != -1) { switch (ch) { case '4': family = AF_INET; break; case '6': family = AF_INET6; break; case 'U': family = AF_UNIX; break; case 'X': if (strcasecmp(optarg, "connect") == 0) socksv = -1; /* HTTP proxy CONNECT */ else if (strcmp(optarg, "4") == 0) socksv = 4; /* SOCKS v.4 */ else if (strcmp(optarg, "5") == 0) socksv = 5; /* SOCKS v.5 */ else errx(1, "unsupported proxy protocol"); break; #ifdef CRYPTO case 'C': Cflag = optarg; break; case 'c': usetls = 1; break; #endif case 'd': dflag = 1; break; case 'e': tls_expectname = optarg; break; case 'F': Fflag = 1; break; #ifdef CRYPTO case 'H': tls_expecthash = optarg; break; #endif case 'h': help(); break; case 'i': iflag = strtoi(optarg, NULL, 0, 0, UINT_MAX, &errnum); if (errnum) errc(1, errnum, "bad interval `%s'", optarg); break; #ifdef CRYPTO case 'K': Kflag = optarg; break; #endif case 'k': kflag = 1; break; case 'l': lflag = 1; break; case 'M': ttl = strtoi(optarg, NULL, 0, 0, 255, &errnum); if (errnum) errc(1, errnum, "bad ttl `%s'", optarg); break; case 'm': minttl = strtoi(optarg, NULL, 0, 0, 255, &errnum); if (errnum) errc(1, errnum, "bad minttl `%s'", optarg); break; case 'N': Nflag = 1; break; case 'n': nflag = 1; break; case 'P': Pflag = optarg; break; case 'p': pflag = optarg; break; #ifdef CRYPTO case 'R': tls_cachanged = 1; Rflag = optarg; break; #endif case 'r': rflag = 1; break; case 's': sflag = optarg; break; case 't': tflag = 1; break; case 'u': uflag = 1; break; #ifdef __OpenBSD__ case 'V': rtableid = (int)strtoi(optarg, NULL, 0, 0, 255, &errnum); if (errnum) errc(1, errnum, "bad rtable `%s'", optarg); break; #endif case 'v': vflag = 1; break; case 'w': timeout = strtoi(optarg, NULL, 0, 0, INT_MAX / 1000, &errnum); if (errnum) errc(1, errnum, "bad timeout `%s'", optarg); timeout *= 1000; break; case 'x': xflag = 1; if ((proxy = strdup(optarg)) == NULL) err(1, NULL); break; case 'z': zflag = 1; break; case 'D': Dflag = 1; break; case 'I': Iflag = strtoi(optarg, NULL, 0, 1, 65536 << 14, &errnum); if (errnum) errc(1, errnum, "bad TCP receive window `%s'", optarg); break; case 'O': Oflag = strtoi(optarg, NULL, 0, 1, 65536 << 14, &errnum); if (errnum) errc(1, errnum, "bad TCP send window `%s'", optarg); break; #ifdef CRYPTO case 'o': oflag = optarg; break; #endif case 'S': Sflag = 1; break; #ifdef CRYPTO case 'T': if (map_tos(optarg, &Tflag)) break; if (map_tls(optarg, &TLSopt)) break; Tflag = (int)strtoi(optarg, NULL, 0, 0, 255, &errnum); if (errnum) errc(1, errnum, "illegal tos/tls value `%s'", optarg); break; #endif default: usage(1); } } argc -= optind; argv += optind; #ifdef __OpenBSD__ if (rtableid >= 0) if (setrtable(rtableid) == -1) err(1, "setrtable"); if (family == AF_UNIX) { if (pledge("stdio rpath wpath cpath tmppath unix", NULL) == -1) err(1, "pledge"); } else if (Fflag) { if (Pflag) { if (pledge("stdio inet dns sendfd tty", NULL) == -1) err(1, "pledge"); } else if (pledge("stdio inet dns sendfd", NULL) == -1) err(1, "pledge"); } else if (Pflag) { if (pledge("stdio inet dns tty", NULL) == -1) err(1, "pledge"); } else if (usetls) { if (pledge("stdio rpath inet dns", NULL) == -1) err(1, "pledge"); } else if (pledge("stdio inet dns", NULL) == -1) err(1, "pledge"); #endif /* Cruft to make sure options are clean, and used properly. */ if (argv[0] && !argv[1] && family == AF_UNIX) { host = argv[0]; uport = NULL; } else if (argv[0] && !argv[1]) { if (!lflag) usage(1); uport = argv[0]; host = NULL; } else if (argv[0] && argv[1]) { host = argv[0]; uport = argv[1]; } else usage(1); if (lflag && sflag) errx(1, "cannot use -s and -l"); if (lflag && pflag) errx(1, "cannot use -p and -l"); if (lflag && zflag) errx(1, "cannot use -z and -l"); if (!lflag && kflag) errx(1, "must use -l with -k"); if (uflag && usetls) errx(1, "cannot use -c and -u"); if ((family == AF_UNIX) && usetls) errx(1, "cannot use -c and -U"); if ((family == AF_UNIX) && Fflag) errx(1, "cannot use -F and -U"); if (Fflag && usetls) errx(1, "cannot use -c and -F"); #ifdef CRYPTO if (TLSopt && !usetls) errx(1, "you must specify -c to use TLS options"); if (Cflag && !usetls) errx(1, "you must specify -c to use -C"); if (Kflag && !usetls) errx(1, "you must specify -c to use -K"); if (oflag && !Cflag) errx(1, "you must specify -C to use -o"); if (tls_cachanged && !usetls) errx(1, "you must specify -c to use -R"); if (tls_expecthash && !usetls) errx(1, "you must specify -c to use -H"); if (tls_expectname && !usetls) errx(1, "you must specify -c to use -e"); #endif /* Get name of temporary socket for unix datagram client */ if ((family == AF_UNIX) && uflag && !lflag) { if (sflag) { unix_dg_tmp_socket = sflag; } else { int fd; snprintf(unix_dg_tmp_socket_buf, sizeof(unix_dg_tmp_socket_buf), "/tmp/%s.XXXXXXXXXX", getprogname()); /* XXX: abstract sockets instead? */ if ((fd = mkstemp(unix_dg_tmp_socket_buf)) == -1) err(1, "mktemp"); close(fd); unix_dg_tmp_socket = unix_dg_tmp_socket_buf; } } /* Initialize addrinfo structure. */ if (family != AF_UNIX) { memset(&hints, 0, sizeof(struct addrinfo)); hints.ai_family = family; hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM; hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP; if (nflag) hints.ai_flags |= AI_NUMERICHOST; } if (xflag) { if (uflag) errx(1, "no proxy support for UDP mode"); if (lflag) errx(1, "no proxy support for listen"); if (family == AF_UNIX) errx(1, "no proxy support for unix sockets"); if (sflag) errx(1, "no proxy support for local source address"); if (*proxy == '[') { ++proxy; proxyport = strchr(proxy, ']'); if (proxyport == NULL) errx(1, "missing closing bracket in proxy"); *proxyport++ = '\0'; if (*proxyport == '\0') /* Use default proxy port. */ proxyport = NULL; else { if (*proxyport == ':') ++proxyport; else errx(1, "garbage proxy port delimiter"); } } else { proxyport = strrchr(proxy, ':'); if (proxyport != NULL) *proxyport++ = '\0'; } memset(&proxyhints, 0, sizeof(struct addrinfo)); proxyhints.ai_family = family; proxyhints.ai_socktype = SOCK_STREAM; proxyhints.ai_protocol = IPPROTO_TCP; if (nflag) proxyhints.ai_flags |= AI_NUMERICHOST; } #ifdef CRYPTO if (usetls) { #if __OpenBSD__ if (Pflag) { if (pledge("stdio inet dns tty rpath", NULL) == -1) err(1, "pledge"); } else if (pledge("stdio inet dns rpath", NULL) == -1) err(1, "pledge"); #endif if (tls_init() == -1) errx(1, "unable to initialize TLS"); if ((tls_cfg = tls_config_new()) == NULL) errx(1, "unable to allocate TLS config"); if (Rflag && tls_config_set_ca_file(tls_cfg, Rflag) == -1) errx(1, "%s", tls_config_error(tls_cfg)); if (Cflag && tls_config_set_cert_file(tls_cfg, Cflag) == -1) errx(1, "%s", tls_config_error(tls_cfg)); if (Kflag && tls_config_set_key_file(tls_cfg, Kflag) == -1) errx(1, "%s", tls_config_error(tls_cfg)); if (oflag && tls_config_set_ocsp_staple_file(tls_cfg, oflag) == -1) errx(1, "%s", tls_config_error(tls_cfg)); if (TLSopt & TLS_ALL) { if (tls_config_set_protocols(tls_cfg, TLS_PROTOCOLS_ALL) != 0) errx(1, "%s", tls_config_error(tls_cfg)); if (tls_config_set_ciphers(tls_cfg, "all") != 0) errx(1, "%s", tls_config_error(tls_cfg)); } if (!lflag && (TLSopt & TLS_CCERT)) errx(1, "clientcert is only valid with -l"); if (TLSopt & TLS_NONAME) tls_config_insecure_noverifyname(tls_cfg); if (TLSopt & TLS_NOVERIFY) { if (tls_expecthash != NULL) errx(1, "-H and -T noverify may not be used" "together"); tls_config_insecure_noverifycert(tls_cfg); } if (TLSopt & TLS_MUSTSTAPLE) tls_config_ocsp_require_stapling(tls_cfg); #ifdef __OpenBSD__ if (Pflag) { if (pledge("stdio inet dns tty", NULL) == -1) err(1, "pledge"); } else if (pledge("stdio inet dns", NULL) == -1) err(1, "pledge"); #endif } #endif if (lflag) { #ifdef CRYPTO struct tls *tls_cctx = NULL; #endif int connfd; ret = 0; if (family == AF_UNIX) { if (uflag) s = unix_bind(host, 0); else s = unix_listen(host); } #ifdef CRYPTO if (usetls) { tls_config_verify_client_optional(tls_cfg); if ((tls_ctx = tls_server()) == NULL) errx(1, "tls server creation failed"); if (tls_configure(tls_ctx, tls_cfg) == -1) errx(1, "tls configuration failed (%s)", tls_error(tls_ctx)); } #endif /* Allow only one connection at a time, but stay alive. */ for (;;) { if (family != AF_UNIX) s = local_listen(host, uport, hints); if (s < 0) err(1, NULL); /* * For UDP and -k, don't connect the socket, let it * receive datagrams from multiple socket pairs. */ if (uflag && kflag) readwrite(s, NULL); /* * For UDP and not -k, we will use recvfrom() initially * to wait for a caller, then use the regular functions * to talk to the caller. */ else if (uflag && !kflag) { int rv, plen; char buf[16384]; struct sockaddr_storage z; len = sizeof(z); plen = 2048; rv = recvfrom(s, buf, plen, MSG_PEEK, (struct sockaddr *)&z, &len); if (rv < 0) err(1, "recvfrom"); rv = connect(s, (struct sockaddr *)&z, len); if (rv < 0) err(1, "connect"); if (vflag) report_connect((struct sockaddr *)&z, len, NULL); readwrite(s, NULL); } else { len = sizeof(cliaddr); connfd = accept4(s, (struct sockaddr *)&cliaddr, &len, SOCK_NONBLOCK); if (connfd == -1) { /* For now, all errnos are fatal */ err(1, "accept"); } if (vflag) report_connect((struct sockaddr *)&cliaddr, len, family == AF_UNIX ? host : NULL); #ifdef CRYPTO if ((usetls) && (tls_cctx = tls_setup_server(tls_ctx, connfd, host))) readwrite(connfd, tls_cctx); if (!usetls) #endif readwrite(connfd, NULL); #ifdef CRYPTO if (tls_cctx) { int i; do { i = tls_close(tls_cctx); } while (i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT); tls_free(tls_cctx); tls_cctx = NULL; } #endif close(connfd); } if (family != AF_UNIX) close(s); else if (uflag) { if (connect(s, NULL, 0) < 0) err(1, "connect"); } if (!kflag) break; } } else if (family == AF_UNIX) { ret = 0; if ((s = unix_connect(host)) > 0 && !zflag) { readwrite(s, NULL); close(s); } else ret = 1; if (uflag) unlink(unix_dg_tmp_socket); exit(ret); } else { int i = 0; /* Construct the portlist[] array. */ build_ports(uport); /* Cycle through portlist, connecting to each port. */ for (s = -1, i = 0; portlist[i] != NULL; i++) { if (s != -1) close(s); #ifdef CRYPTO if (usetls) { if ((tls_ctx = tls_client()) == NULL) errx(1, "tls client creation failed"); if (tls_configure(tls_ctx, tls_cfg) == -1) errx(1, "tls configuration failed (%s)", tls_error(tls_ctx)); } #endif if (xflag) s = socks_connect(host, portlist[i], hints, proxy, proxyport, proxyhints, socksv, Pflag); else s = remote_connect(host, portlist[i], hints); if (s == -1) continue; ret = 0; if (vflag || zflag) { /* For UDP, make sure we are connected. */ if (uflag) { if (udptest(s) == -1) { ret = 1; continue; } } /* Don't look up port if -n. */ if (nflag) sv = NULL; else { sv = getservbyport( ntohs(atoi(portlist[i])), uflag ? "udp" : "tcp"); } fprintf(stderr, "Connection to %s %s port [%s/%s] " "succeeded!\n", host, portlist[i], uflag ? "udp" : "tcp", sv ? sv->s_name : "*"); } if (Fflag) fdpass(s); else { #ifdef CRYPTO if (usetls) tls_setup_client(tls_ctx, s, host); if (!zflag) readwrite(s, tls_ctx); if (tls_ctx) { int j; do { j = tls_close(tls_ctx); } while (j == TLS_WANT_POLLIN || j == TLS_WANT_POLLOUT); tls_free(tls_ctx); tls_ctx = NULL; } #else if (!zflag) readwrite(s, NULL); #endif } } } if (s != -1) close(s); #ifdef CRYPTO tls_config_free(tls_cfg); #endif exit(ret); } /* * unix_bind() * Returns a unix socket bound to the given path */ int unix_bind(char *path, int flags) { struct sockaddr_un s_un; int s, save_errno; /* Create unix domain socket. */ if ((s = socket(AF_UNIX, flags | (uflag ? SOCK_DGRAM : SOCK_STREAM), 0)) < 0) return (-1); memset(&s_un, 0, sizeof(struct sockaddr_un)); s_un.sun_family = AF_UNIX; if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >= sizeof(s_un.sun_path)) { close(s); errno = ENAMETOOLONG; return (-1); } if (bind(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) { save_errno = errno; close(s); errno = save_errno; return (-1); } return (s); } #ifdef CRYPTO void tls_setup_client(struct tls *tls_ctx, int s, char *host) { int i; if (tls_connect_socket(tls_ctx, s, tls_expectname ? tls_expectname : host) == -1) { errx(1, "tls connection failed (%s)", tls_error(tls_ctx)); } do { if ((i = tls_handshake(tls_ctx)) == -1) errx(1, "tls handshake failed (%s)", tls_error(tls_ctx)); } while (i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT); if (vflag) report_tls(tls_ctx, host, tls_expectname); if (tls_expecthash && tls_peer_cert_hash(tls_ctx) && strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0) errx(1, "peer certificate is not %s", tls_expecthash); } struct tls * tls_setup_server(struct tls *tls_ctx, int connfd, char *host) { struct tls *tls_cctx; if (tls_accept_socket(tls_ctx, &tls_cctx, connfd) == -1) { warnx("tls accept failed (%s)", tls_error(tls_ctx)); tls_cctx = NULL; } else { int i; do { if ((i = tls_handshake(tls_cctx)) == -1) warnx("tls handshake failed (%s)", tls_error(tls_cctx)); } while(i == TLS_WANT_POLLIN || i == TLS_WANT_POLLOUT); } if (tls_cctx) { int gotcert = tls_peer_cert_provided(tls_cctx); if (vflag && gotcert) report_tls(tls_cctx, host, tls_expectname); if ((TLSopt & TLS_CCERT) && !gotcert) warnx("No client certificate provided"); else if (gotcert && tls_peer_cert_hash(tls_ctx) && tls_expecthash && strcmp(tls_expecthash, tls_peer_cert_hash(tls_ctx)) != 0) warnx("peer certificate is not %s", tls_expecthash); else if (gotcert && tls_expectname && (!tls_peer_cert_contains_name(tls_cctx, tls_expectname))) warnx("name (%s) not found in client cert", tls_expectname); else { return tls_cctx; } } return NULL; } #endif /* * unix_connect() * Returns a socket connected to a local unix socket. Returns -1 on failure. */ int unix_connect(char *path) { struct sockaddr_un s_un; int s, save_errno; if (uflag) { if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) < 0) return (-1); } else { if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0) return (-1); } memset(&s_un, 0, sizeof(struct sockaddr_un)); s_un.sun_family = AF_UNIX; if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >= sizeof(s_un.sun_path)) { close(s); errno = ENAMETOOLONG; return (-1); } if (connect(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) { save_errno = errno; close(s); errno = save_errno; return (-1); } return (s); } /* * unix_listen() * Create a unix domain socket, and listen on it. */ int unix_listen(char *path) { int s; if ((s = unix_bind(path, 0)) < 0) return (-1); if (listen(s, 5) < 0) { close(s); return (-1); } return (s); } /* * remote_connect() * Returns a socket connected to a remote host. Properly binds to a local * port or source address if needed. Returns -1 on failure. */ int remote_connect(const char *host, const char *port, struct addrinfo hints) { struct addrinfo *res, *res0; int s = -1, error, save_errno; #ifdef SO_BINDANY int on = 1; #endif if ((error = getaddrinfo(host, port, &hints, &res0))) errx(1, "getaddrinfo: %s", gai_strerror(error)); for (res = res0; res; res = res->ai_next) { if ((s = socket(res->ai_family, res->ai_socktype | SOCK_NONBLOCK, res->ai_protocol)) < 0) continue; /* Bind to a local port or source address if specified. */ if (sflag || pflag) { struct addrinfo ahints, *ares; #ifdef SO_BINDANY /* try SO_BINDANY, but don't insist */ setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on)); #endif memset(&ahints, 0, sizeof(struct addrinfo)); ahints.ai_family = res->ai_family; ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM; ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP; ahints.ai_flags = AI_PASSIVE; if ((error = getaddrinfo(sflag, pflag, &ahints, &ares))) errx(1, "getaddrinfo: %s", gai_strerror(error)); if (bind(s, (struct sockaddr *)ares->ai_addr, ares->ai_addrlen) < 0) err(1, "bind failed"); freeaddrinfo(ares); } set_common_sockopts(s, res->ai_family); if (timeout_connect(s, res->ai_addr, res->ai_addrlen) == 0) break; if (vflag) warn("connect to %s port %s (%s) failed", host, port, uflag ? "udp" : "tcp"); save_errno = errno; close(s); errno = save_errno; s = -1; } freeaddrinfo(res0); return (s); } int timeout_connect(int s, const struct sockaddr *name, socklen_t namelen) { struct pollfd pfd; socklen_t optlen; int optval; int ret; if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) { pfd.fd = s; pfd.events = POLLOUT; if ((ret = poll(&pfd, 1, timeout)) == 1) { optlen = sizeof(optval); if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR, &optval, &optlen)) == 0) { errno = optval; ret = optval == 0 ? 0 : -1; } } else if (ret == 0) { errno = ETIMEDOUT; ret = -1; } else err(1, "poll failed"); } return (ret); } /* * local_listen() * Returns a socket listening on a local port, binds to specified source * address. Returns -1 on failure. */ int local_listen(char *host, char *port, struct addrinfo hints) { struct addrinfo *res, *res0; int s = -1, ret, x = 1, save_errno; int error; /* Allow nodename to be null. */ hints.ai_flags |= AI_PASSIVE; /* * In the case of binding to a wildcard address * default to binding to an ipv4 address. */ if (host == NULL && hints.ai_family == AF_UNSPEC) hints.ai_family = AF_INET; if ((error = getaddrinfo(host, port, &hints, &res0))) errx(1, "getaddrinfo: %s", gai_strerror(error)); for (res = res0; res; res = res->ai_next) { if ((s = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) < 0) continue; ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x)); if (ret == -1) err(1, NULL); set_common_sockopts(s, res->ai_family); if (bind(s, (struct sockaddr *)res->ai_addr, res->ai_addrlen) == 0) break; save_errno = errno; close(s); errno = save_errno; s = -1; } if (!uflag && s != -1) { if (listen(s, 1) < 0) err(1, "listen"); } freeaddrinfo(res0); return (s); } /* * readwrite() * Loop that polls on the network file descriptor and stdin. */ void readwrite(int net_fd, struct tls *tls_ctx) { struct pollfd pfd[4]; int stdin_fd = STDIN_FILENO; int stdout_fd = STDOUT_FILENO; unsigned char netinbuf[BUFSIZE]; size_t netinbufpos = 0; unsigned char stdinbuf[BUFSIZE]; size_t stdinbufpos = 0; int n, num_fds; ssize_t ret; /* don't read from stdin if requested */ if (dflag) stdin_fd = -1; /* stdin */ pfd[POLL_STDIN].fd = stdin_fd; pfd[POLL_STDIN].events = POLLIN; /* network out */ pfd[POLL_NETOUT].fd = net_fd; pfd[POLL_NETOUT].events = 0; /* network in */ pfd[POLL_NETIN].fd = net_fd; pfd[POLL_NETIN].events = POLLIN; /* stdout */ pfd[POLL_STDOUT].fd = stdout_fd; pfd[POLL_STDOUT].events = 0; while (1) { /* both inputs are gone, buffers are empty, we are done */ if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 && stdinbufpos == 0 && netinbufpos == 0) { close(net_fd); return; } /* both outputs are gone, we can't continue */ if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1) { close(net_fd); return; } /* listen and net in gone, queues empty, done */ if (lflag && pfd[POLL_NETIN].fd == -1 && stdinbufpos == 0 && netinbufpos == 0) { close(net_fd); return; } /* help says -i is for "wait between lines sent". We read and * write arbitrary amounts of data, and we don't want to start * scanning for newlines, so this is as good as it gets */ if (iflag) sleep(iflag); /* poll */ num_fds = poll(pfd, 4, timeout); /* treat poll errors */ if (num_fds == -1) { close(net_fd); err(1, "polling error"); } /* timeout happened */ if (num_fds == 0) return; /* treat socket error conditions */ for (n = 0; n < 4; n++) { if (pfd[n].revents & (POLLERR|POLLNVAL)) { pfd[n].fd = -1; } } /* reading is possible after HUP */ if (pfd[POLL_STDIN].events & POLLIN && pfd[POLL_STDIN].revents & POLLHUP && !(pfd[POLL_STDIN].revents & POLLIN)) pfd[POLL_STDIN].fd = -1; if (pfd[POLL_NETIN].events & POLLIN && pfd[POLL_NETIN].revents & POLLHUP && !(pfd[POLL_NETIN].revents & POLLIN)) pfd[POLL_NETIN].fd = -1; if (pfd[POLL_NETOUT].revents & POLLHUP) { if (Nflag) shutdown(pfd[POLL_NETOUT].fd, SHUT_WR); pfd[POLL_NETOUT].fd = -1; } /* if HUP, stop watching stdout */ if (pfd[POLL_STDOUT].revents & POLLHUP) pfd[POLL_STDOUT].fd = -1; /* if no net out, stop watching stdin */ if (pfd[POLL_NETOUT].fd == -1) pfd[POLL_STDIN].fd = -1; /* if no stdout, stop watching net in */ if (pfd[POLL_STDOUT].fd == -1) { if (pfd[POLL_NETIN].fd != -1) shutdown(pfd[POLL_NETIN].fd, SHUT_RD); pfd[POLL_NETIN].fd = -1; } /* try to read from stdin */ if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) { ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf, &stdinbufpos, NULL); if (ret == TLS_WANT_POLLIN) pfd[POLL_STDIN].events = POLLIN; else if (ret == TLS_WANT_POLLOUT) pfd[POLL_STDIN].events = POLLOUT; else if (ret == 0 || ret == -1) pfd[POLL_STDIN].fd = -1; /* read something - poll net out */ if (stdinbufpos > 0) pfd[POLL_NETOUT].events = POLLOUT; /* filled buffer - remove self from polling */ if (stdinbufpos == BUFSIZE) pfd[POLL_STDIN].events = 0; } /* try to write to network */ if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) { ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf, &stdinbufpos, tls_ctx); if (ret == TLS_WANT_POLLIN) pfd[POLL_NETOUT].events = POLLIN; else if (ret == TLS_WANT_POLLOUT) pfd[POLL_NETOUT].events = POLLOUT; else if (ret == -1) pfd[POLL_NETOUT].fd = -1; /* buffer empty - remove self from polling */ if (stdinbufpos == 0) pfd[POLL_NETOUT].events = 0; /* buffer no longer full - poll stdin again */ if (stdinbufpos < BUFSIZE) pfd[POLL_STDIN].events = POLLIN; } /* try to read from network */ if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) { ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf, &netinbufpos, tls_ctx); if (ret == TLS_WANT_POLLIN) pfd[POLL_NETIN].events = POLLIN; else if (ret == TLS_WANT_POLLOUT) pfd[POLL_NETIN].events = POLLOUT; else if (ret == -1) pfd[POLL_NETIN].fd = -1; /* eof on net in - remove from pfd */ if (ret == 0) { shutdown(pfd[POLL_NETIN].fd, SHUT_RD); pfd[POLL_NETIN].fd = -1; } /* read something - poll stdout */ if (netinbufpos > 0) pfd[POLL_STDOUT].events = POLLOUT; /* filled buffer - remove self from polling */ if (netinbufpos == BUFSIZE) pfd[POLL_NETIN].events = 0; /* handle telnet */ if (tflag) atelnet(pfd[POLL_NETIN].fd, netinbuf, netinbufpos); } /* try to write to stdout */ if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) { ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf, &netinbufpos, NULL); if (ret == TLS_WANT_POLLIN) pfd[POLL_STDOUT].events = POLLIN; else if (ret == TLS_WANT_POLLOUT) pfd[POLL_STDOUT].events = POLLOUT; else if (ret == -1) pfd[POLL_STDOUT].fd = -1; /* buffer empty - remove self from polling */ if (netinbufpos == 0) pfd[POLL_STDOUT].events = 0; /* buffer no longer full - poll net in again */ if (netinbufpos < BUFSIZE) pfd[POLL_NETIN].events = POLLIN; } /* stdin gone and queue empty? */ if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) { if (pfd[POLL_NETOUT].fd != -1 && Nflag) shutdown(pfd[POLL_NETOUT].fd, SHUT_WR); pfd[POLL_NETOUT].fd = -1; } /* net in gone and queue empty? */ if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) { pfd[POLL_STDOUT].fd = -1; } } } ssize_t drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls) { ssize_t n; ssize_t adjust; #ifdef CRYPTO if (tls) n = tls_write(tls, buf, *bufpos); else #endif { n = write(fd, buf, *bufpos); /* don't treat EAGAIN, EINTR as error */ if (n == -1 && (errno == EAGAIN || errno == EINTR)) n = TLS_WANT_POLLOUT; } if (n <= 0) return n; /* adjust buffer */ adjust = *bufpos - n; if (adjust > 0) memmove(buf, buf + n, adjust); *bufpos -= n; return n; } ssize_t fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls) { size_t num = BUFSIZE - *bufpos; ssize_t n; #ifdef CRYPTO if (tls) n = tls_read(tls, buf + *bufpos, num); else #endif { n = read(fd, buf + *bufpos, num); /* don't treat EAGAIN, EINTR as error */ if (n == -1 && (errno == EAGAIN || errno == EINTR)) n = TLS_WANT_POLLIN; } if (n <= 0) return n; *bufpos += n; return n; } /* * fdpass() * Pass the connected file descriptor to stdout and exit. */ void fdpass(int nfd) { struct msghdr mh; union { struct cmsghdr hdr; char buf[CMSG_SPACE(sizeof(int))]; } cmsgbuf; struct cmsghdr *cmsg; struct iovec iov; char c = '\0'; ssize_t r; struct pollfd pfd; /* Avoid obvious stupidity */ if (isatty(STDOUT_FILENO)) errx(1, "Cannot pass file descriptor to tty"); bzero(&mh, sizeof(mh)); bzero(&cmsgbuf, sizeof(cmsgbuf)); bzero(&iov, sizeof(iov)); mh.msg_control = (caddr_t)&cmsgbuf.buf; mh.msg_controllen = sizeof(cmsgbuf.buf); cmsg = CMSG_FIRSTHDR(&mh); cmsg->cmsg_len = CMSG_LEN(sizeof(int)); cmsg->cmsg_level = SOL_SOCKET; cmsg->cmsg_type = SCM_RIGHTS; *(int *)CMSG_DATA(cmsg) = nfd; iov.iov_base = &c; iov.iov_len = 1; mh.msg_iov = &iov; mh.msg_iovlen = 1; bzero(&pfd, sizeof(pfd)); pfd.fd = STDOUT_FILENO; pfd.events = POLLOUT; for (;;) { r = sendmsg(STDOUT_FILENO, &mh, 0); if (r == -1) { if (errno == EAGAIN || errno == EINTR) { if (poll(&pfd, 1, -1) == -1) err(1, "poll"); continue; } err(1, "sendmsg"); } else if (r != 1) errx(1, "sendmsg: unexpected return value %zd", r); else break; } exit(0); } /* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */ void atelnet(int nfd, unsigned char *buf, unsigned int size) { unsigned char *p, *end; unsigned char obuf[4]; if (size < 3) return; end = buf + size - 2; for (p = buf; p < end; p++) { if (*p != IAC) continue; obuf[0] = IAC; p++; if ((*p == WILL) || (*p == WONT)) obuf[1] = DONT; else if ((*p == DO) || (*p == DONT)) obuf[1] = WONT; else continue; p++; obuf[2] = *p; if (atomicio(vwrite, nfd, obuf, 3) != 3) warn("Write Error!"); } } static int strtoport(const char *portstr, int udp) { struct servent *entry; int errnum; const char *proto; int port; proto = udp ? "udp" : "tcp"; port = strtoi(portstr, NULL, 0, 1, PORT_MAX, &errnum); if (errnum == 0) return port; if ((entry = getservbyname(portstr, proto)) == NULL) errx(1, "service \"%s\" unknown", portstr); return ntohs(entry->s_port); } /* * build_ports() * Build an array of ports in portlist[], listing each port * that we should try to connect to. */ void build_ports(char *p) { char *n; int hi, lo, cp; int x = 0; if ((n = strchr(p, '-')) != NULL) { *n = '\0'; n++; /* Make sure the ports are in order: lowest->highest. */ hi = strtoport(n, uflag); lo = strtoport(p, uflag); if (lo > hi) { cp = hi; hi = lo; lo = cp; } /* * Initialize portlist with a random permutation. Based on * Knuth, as in ip_randomid() in sys/netinet/ip_id.c. */ if (rflag) { for (x = 0; x <= hi - lo; x++) { cp = arc4random_uniform(x + 1); portlist[x] = portlist[cp]; if (asprintf(&portlist[cp], "%d", x + lo) < 0) err(1, "asprintf"); } } else { /* Load ports sequentially. */ for (cp = lo; cp <= hi; cp++) { if (asprintf(&portlist[x], "%d", cp) < 0) err(1, "asprintf"); x++; } } } else { char *tmp; hi = strtoport(p, uflag); if (asprintf(&tmp, "%d", hi) != -1) portlist[0] = tmp; else err(1, NULL); } } /* * udptest() * Do a few writes to see if the UDP port is there. * Fails once PF state table is full. */ int udptest(int s) { int i, ret; for (i = 0; i <= 3; i++) { if (write(s, "X", 1) == 1) ret = 1; else ret = -1; } return (ret); } void set_common_sockopts(int s, int af) { int x = 1; if (Sflag) { if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG, &x, sizeof(x)) == -1) err(1, NULL); } if (Dflag) { if (setsockopt(s, SOL_SOCKET, SO_DEBUG, &x, sizeof(x)) == -1) err(1, NULL); } if (Tflag != -1) { if (af == AF_INET && setsockopt(s, IPPROTO_IP, IP_TOS, &Tflag, sizeof(Tflag)) == -1) err(1, "set IP ToS"); else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6, IPV6_TCLASS, &Tflag, sizeof(Tflag)) == -1) err(1, "set IPv6 traffic class"); } if (Iflag) { if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, &Iflag, sizeof(Iflag)) == -1) err(1, "set TCP receive buffer size"); } if (Oflag) { if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &Oflag, sizeof(Oflag)) == -1) err(1, "set TCP send buffer size"); } if (ttl != -1) { if (af == AF_INET && setsockopt(s, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl))) err(1, "set IP TTL"); else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl))) err(1, "set IPv6 unicast hops"); } if (minttl != -1) { if (af == AF_INET && setsockopt(s, IPPROTO_IP, IP_MINTTL, &minttl, sizeof(minttl))) err(1, "set IP min TTL"); #ifdef IPV6_MINHOPCOUNT else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6, IPV6_MINHOPCOUNT, &minttl, sizeof(minttl))) err(1, "set IPv6 min hop count"); #endif } } int map_tos(char *s, int *val) { /* DiffServ Codepoints and other TOS mappings */ const struct toskeywords { const char *keyword; int val; } *t, toskeywords[] = { { "af11", IPTOS_DSCP_AF11 }, { "af12", IPTOS_DSCP_AF12 }, { "af13", IPTOS_DSCP_AF13 }, { "af21", IPTOS_DSCP_AF21 }, { "af22", IPTOS_DSCP_AF22 }, { "af23", IPTOS_DSCP_AF23 }, { "af31", IPTOS_DSCP_AF31 }, { "af32", IPTOS_DSCP_AF32 }, { "af33", IPTOS_DSCP_AF33 }, { "af41", IPTOS_DSCP_AF41 }, { "af42", IPTOS_DSCP_AF42 }, { "af43", IPTOS_DSCP_AF43 }, { "critical", IPTOS_PREC_CRITIC_ECP }, { "cs0", IPTOS_DSCP_CS0 }, { "cs1", IPTOS_DSCP_CS1 }, { "cs2", IPTOS_DSCP_CS2 }, { "cs3", IPTOS_DSCP_CS3 }, { "cs4", IPTOS_DSCP_CS4 }, { "cs5", IPTOS_DSCP_CS5 }, { "cs6", IPTOS_DSCP_CS6 }, { "cs7", IPTOS_DSCP_CS7 }, { "ef", IPTOS_DSCP_EF }, { "inetcontrol", IPTOS_PREC_INTERNETCONTROL }, { "lowdelay", IPTOS_LOWDELAY }, { "netcontrol", IPTOS_PREC_NETCONTROL }, { "reliability", IPTOS_RELIABILITY }, { "throughput", IPTOS_THROUGHPUT }, { NULL, -1 }, }; for (t = toskeywords; t->keyword != NULL; t++) { if (strcmp(s, t->keyword) == 0) { *val = t->val; return (1); } } return (0); } #ifdef CRYPTO int map_tls(char *s, int *val) { const struct tlskeywords { const char *keyword; int val; } *t, tlskeywords[] = { { "tlsall", TLS_ALL }, { "noverify", TLS_NOVERIFY }, { "noname", TLS_NONAME }, { "clientcert", TLS_CCERT}, { "muststaple", TLS_MUSTSTAPLE}, { NULL, -1 }, }; for (t = tlskeywords; t->keyword != NULL; t++) { if (strcmp(s, t->keyword) == 0) { *val |= t->val; return (1); } } return (0); } void report_tls(struct tls * tls_ctx, char * host, char *tlsexpectname) { time_t t; const char *ocsp_url; fprintf(stderr, "TLS handshake negotiated %s/%s with host %s\n", tls_conn_version(tls_ctx), tls_conn_cipher(tls_ctx), host); fprintf(stderr, "Peer name: %s\n", tlsexpectname ? tlsexpectname : host); if (tls_peer_cert_subject(tls_ctx)) fprintf(stderr, "Subject: %s\n", tls_peer_cert_subject(tls_ctx)); if (tls_peer_cert_issuer(tls_ctx)) fprintf(stderr, "Issuer: %s\n", tls_peer_cert_issuer(tls_ctx)); if ((t = tls_peer_cert_notbefore(tls_ctx)) != -1) fprintf(stderr, "Valid From: %s", ctime(&t)); if ((t = tls_peer_cert_notafter(tls_ctx)) != -1) fprintf(stderr, "Valid Until: %s", ctime(&t)); if (tls_peer_cert_hash(tls_ctx)) fprintf(stderr, "Cert Hash: %s\n", tls_peer_cert_hash(tls_ctx)); ocsp_url = tls_peer_ocsp_url(tls_ctx); if (ocsp_url != NULL) fprintf(stderr, "OCSP URL: %s\n", ocsp_url); switch (tls_peer_ocsp_response_status(tls_ctx)) { case TLS_OCSP_RESPONSE_SUCCESSFUL: fprintf(stderr, "OCSP Stapling: %s\n", tls_peer_ocsp_result(tls_ctx) == NULL ? "" : tls_peer_ocsp_result(tls_ctx)); fprintf(stderr, " response_status=%d cert_status=%d crl_reason=%d\n", tls_peer_ocsp_response_status(tls_ctx), tls_peer_ocsp_cert_status(tls_ctx), tls_peer_ocsp_crl_reason(tls_ctx)); t = tls_peer_ocsp_this_update(tls_ctx); fprintf(stderr, " this update: %s", t != -1 ? ctime(&t) : "\n"); t = tls_peer_ocsp_next_update(tls_ctx); fprintf(stderr, " next update: %s", t != -1 ? ctime(&t) : "\n"); t = tls_peer_ocsp_revocation_time(tls_ctx); fprintf(stderr, " revocation: %s", t != -1 ? ctime(&t) : "\n"); break; case -1: break; default: fprintf(stderr, "OCSP Stapling: failure - response_status %d (%s)\n", tls_peer_ocsp_response_status(tls_ctx), tls_peer_ocsp_result(tls_ctx) == NULL ? "" : tls_peer_ocsp_result(tls_ctx)); break; } } #endif void report_connect(const struct sockaddr *sa, socklen_t salen, char *path) { char remote_host[NI_MAXHOST]; char remote_port[NI_MAXSERV]; int herr; int flags = NI_NUMERICSERV; if (path != NULL) { fprintf(stderr, "Connection on %s received!\n", path); return; } if (nflag) flags |= NI_NUMERICHOST; if ((herr = getnameinfo(sa, salen, remote_host, sizeof(remote_host), remote_port, sizeof(remote_port), flags)) != 0) { if (herr == EAI_SYSTEM) err(1, "getnameinfo"); else errx(1, "getnameinfo: %s", gai_strerror(herr)); } fprintf(stderr, "Connection from %s %s " "received!\n", remote_host, remote_port); } void help(void) { usage(0); fprintf(stderr, "\tCommand Summary:\n" "\t-4 Use IPv4\n" "\t-6 Use IPv6\n" #ifdef CRYPTO "\t-C certfile Public key file\n" "\t-c Use TLS\n" #endif "\t-D Enable the debug socket option\n" "\t-d Detach from stdin\n" #ifdef CRYPTO "\t-e name\t Required name in peer certificate\n" #endif "\t-F Pass socket fd\n" #ifdef CRYPTO "\t-H hash\t Hash string of peer certificate\n" #endif "\t-h This help text\n" "\t-I length TCP receive buffer length\n" "\t-i interval Delay interval for lines sent, ports scanned\n" #ifdef CRYPTO "\t-K keyfile Private key file\n" #endif "\t-k Keep inbound sockets open for multiple connects\n" "\t-l Listen mode, for inbound connects\n" "\t-M ttl Outgoing TTL / Hop Limit\n" "\t-m minttl Minimum incoming TTL / Hop Limit\n" "\t-N Shutdown the network socket after EOF on stdin\n" "\t-n Suppress name/port resolutions\n" "\t-O length TCP send buffer length\n" #ifdef CRYPTO "\t-o staplefile Staple file\n" #endif "\t-P proxyuser\tUsername for proxy authentication\n" "\t-p port\t Specify local port for remote connects\n" #ifdef CRYPTO "\t-R CAfile CA bundle\n" #endif "\t-r Randomize remote ports\n" "\t-S Enable the TCP MD5 signature option\n" "\t-s source Local source address\n" #ifdef CRYPTO "\t-T keyword TOS value or TLS options\n" #endif "\t-t Answer TELNET negotiation\n" "\t-U Use UNIX domain socket\n" "\t-u UDP mode\n" #ifdef __OpenBSD__ "\t-V rtable Specify alternate routing table\n" #endif "\t-v Verbose\n" "\t-w timeout Timeout for connects and final net reads\n" "\t-X proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n" "\t-x addr[:port]\tSpecify proxy address and port\n" "\t-z Zero-I/O mode [used for scanning]\n" "Port numbers can be individual or ranges: lo-hi [inclusive]\n"); exit(1); } void usage(int ret) { fprintf(stderr, "Usage: %s [-46%sDdFhklNnrStUuvz] [-e name] [-I length]\n" #ifdef CRYPTO "\t [-C certfile] [-H hash] [-K keyfile] [-R CAfile] " "[-T keyword] [-o staplefile]\n" #endif "\t [-i interval] [-M ttl] [-m minttl] [-O length]\n" "\t [-P proxy_username] [-p source_port]\n" "\t [-s source] " #ifdef __OpenBSD__ "[-V rtable] " #endif "[-w timeout] [-X proxy_protocol]\n" "\t [-x proxy_address[:port]] [destination] [port]\n", getprogname(), #ifdef CRYPTO "c" #else "" #endif ); if (ret) exit(1); }