diff options
Diffstat (limited to 'remote_cmds/telnetd.tproj/telnetd.c')
| -rw-r--r-- | remote_cmds/telnetd.tproj/telnetd.c | 1330 |
1 files changed, 1330 insertions, 0 deletions
diff --git a/remote_cmds/telnetd.tproj/telnetd.c b/remote_cmds/telnetd.tproj/telnetd.c new file mode 100644 index 0000000..a952a93 --- /dev/null +++ b/remote_cmds/telnetd.tproj/telnetd.c @@ -0,0 +1,1330 @@ +/* + * Copyright (c) 1989, 1993 + * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. + */ + +#if 0 +#ifndef lint +static const char sccsid[] = "@(#)telnetd.c 8.4 (Berkeley) 5/30/95"; +#endif +#endif +#include <sys/cdefs.h> +__FBSDID("$FreeBSD: src/contrib/telnet/telnetd/telnetd.c,v 1.29 2006/09/26 21:46:11 ru Exp $"); + +#include "telnetd.h" +#include "pathnames.h" + +#include <sys/mman.h> +#include <err.h> +#ifndef __APPLE__ +#include <libutil.h> +#endif +#include <paths.h> +#include <termcap.h> +#ifndef __APPLE__ +#include <utmp.h> +#endif + +#include <arpa/inet.h> + +#ifdef AUTHENTICATION +#include <libtelnet/auth.h> +int auth_level = 0; +#endif +#ifdef ENCRYPTION +#include <libtelnet/encrypt.h> +#endif +#include <libtelnet/misc.h> + +char remote_hostname[MAXHOSTNAMELEN]; +size_t utmp_len = sizeof(remote_hostname) - 1; +int registerd_host_only = 0; + + +/* + * I/O data buffers, + * pointers, and counters. + */ +char ptyibuf[BUFSIZ], *ptyip = ptyibuf; +char ptyibuf2[BUFSIZ]; + +int readstream(int, char *, int); +void doit(struct sockaddr *); +int terminaltypeok(char *); + +int hostinfo = 1; /* do we print login banner? */ + +static int debug = 0; +int keepalive = 1; +const char *altlogin; + +void doit(struct sockaddr *); +int terminaltypeok(char *); +void startslave(char *, int, char *); +extern void usage(void); +static void _gettermname(void); + +/* + * The string to pass to getopt(). We do it this way so + * that only the actual options that we support will be + * passed off to getopt(). + */ +char valid_opts[] = { + 'd', ':', 'h', 'k', 'n', 'p', ':', 'S', ':', 'u', ':', 'U', + '4', '6', +#ifdef AUTHENTICATION + 'a', ':', 'X', ':', +#endif +#ifdef BFTPDAEMON + 'B', +#endif +#ifdef DIAGNOSTICS + 'D', ':', +#endif +#ifdef ENCRYPTION + 'e', ':', +#endif +#ifdef LINEMODE + 'l', +#endif + '\0' +}; + +int family = AF_INET; + +#ifndef MAXHOSTNAMELEN +#define MAXHOSTNAMELEN 256 +#endif /* MAXHOSTNAMELEN */ + +char *hostname; +char host_name[MAXHOSTNAMELEN]; + +extern void telnet(int, int, char *); + +int level; +char user_name[256]; + +int +main(int argc, char *argv[]) +{ + u_long ultmp; + struct sockaddr_storage from; +#ifdef __APPLE__ + int on = 1; + socklen_t fromlen; +#else + int on = 1, fromlen; +#endif + int ch; +#if defined(IPPROTO_IP) && defined(IP_TOS) + int tos = -1; +#endif + char *ep; + + // radar:17828581 + (void)signal(SIGTERM, SIG_DFL); + + pfrontp = pbackp = ptyobuf; + netip = netibuf; + nfrontp = nbackp = netobuf; +#ifdef ENCRYPTION + nclearto = 0; +#endif /* ENCRYPTION */ + + /* + * This initialization causes linemode to default to a configuration + * that works on all telnet clients, including the FreeBSD client. + * This is not quite the same as the telnet client issuing a "mode + * character" command, but has most of the same benefits, and is + * preferable since some clients (like usofts) don't have the + * mode character command anyway and linemode breaks things. + * The most notable symptom of fix is that csh "set filec" operations + * like <ESC> (filename completion) and ^D (choices) keys now work + * in telnet sessions and can be used more than once on the same line. + * CR/LF handling is also corrected in some termio modes. This + * change resolves problem reports bin/771 and bin/1037. + */ + + linemode=1; /*Default to mode that works on bulk of clients*/ + + while ((ch = getopt(argc, argv, valid_opts)) != -1) { + switch(ch) { + +#ifdef AUTHENTICATION + case 'a': + /* + * Check for required authentication level + */ + if (strcmp(optarg, "debug") == 0) { + extern int auth_debug_mode; + auth_debug_mode = 1; + } else if (strcasecmp(optarg, "none") == 0) { + auth_level = 0; + } else if (strcasecmp(optarg, "other") == 0) { + auth_level = AUTH_OTHER; + } else if (strcasecmp(optarg, "user") == 0) { + auth_level = AUTH_USER; + } else if (strcasecmp(optarg, "valid") == 0) { + auth_level = AUTH_VALID; + } else if (strcasecmp(optarg, "off") == 0) { + /* + * This hack turns off authentication + */ + auth_level = -1; + } else { + warnx("unknown authorization level for -a"); + } + break; +#endif /* AUTHENTICATION */ + +#ifdef BFTPDAEMON + case 'B': + bftpd++; + break; +#endif /* BFTPDAEMON */ + + case 'd': + if (strcmp(optarg, "ebug") == 0) { + debug++; + break; + } + usage(); + /* NOTREACHED */ + break; + +#ifdef DIAGNOSTICS + case 'D': + /* + * Check for desired diagnostics capabilities. + */ + if (!strcmp(optarg, "report")) { + diagnostic |= TD_REPORT|TD_OPTIONS; + } else if (!strcmp(optarg, "exercise")) { + diagnostic |= TD_EXERCISE; + } else if (!strcmp(optarg, "netdata")) { + diagnostic |= TD_NETDATA; + } else if (!strcmp(optarg, "ptydata")) { + diagnostic |= TD_PTYDATA; + } else if (!strcmp(optarg, "options")) { + diagnostic |= TD_OPTIONS; + } else { + usage(); + /* NOT REACHED */ + } + break; +#endif /* DIAGNOSTICS */ + +#ifdef ENCRYPTION + case 'e': + if (strcmp(optarg, "debug") == 0) { + extern int encrypt_debug_mode; + encrypt_debug_mode = 1; + break; + } + usage(); + /* NOTREACHED */ + break; +#endif /* ENCRYPTION */ + + case 'h': + hostinfo = 0; + break; + +#ifdef LINEMODE + case 'l': + alwayslinemode = 1; + break; +#endif /* LINEMODE */ + + case 'k': +#if defined(LINEMODE) && defined(KLUDGELINEMODE) + lmodetype = NO_AUTOKLUDGE; +#else + /* ignore -k option if built without kludge linemode */ +#endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */ + break; + + case 'n': + keepalive = 0; + break; + + case 'p': + altlogin = optarg; + break; + + case 'S': +#ifdef HAS_GETTOS + if ((tos = parsetos(optarg, "tcp")) < 0) + warnx("%s%s%s", + "bad TOS argument '", optarg, + "'; will try to use default TOS"); +#else +#define MAXTOS 255 + ultmp = strtoul(optarg, &ep, 0); + if (*ep || ep == optarg || ultmp > MAXTOS) + warnx("%s%s%s", + "bad TOS argument '", optarg, + "'; will try to use default TOS"); + else + tos = ultmp; +#endif + break; + + case 'u': + utmp_len = (size_t)atoi(optarg); + if (utmp_len >= sizeof(remote_hostname)) + utmp_len = sizeof(remote_hostname) - 1; + break; + + case 'U': + registerd_host_only = 1; + break; + +#ifdef AUTHENTICATION + case 'X': + /* + * Check for invalid authentication types + */ + auth_disable_name(optarg); + break; +#endif /* AUTHENTICATION */ + + case '4': + family = AF_INET; + break; + +#ifdef INET6 + case '6': + family = AF_INET6; + break; +#endif + + default: + warnx("%c: unknown option", ch); + /* FALLTHROUGH */ + case '?': + usage(); + /* NOTREACHED */ + } + } + + argc -= optind; + argv += optind; + + if (debug) { +#ifdef __APPLE__ + int s, ns, error; + socklen_t foo; +#else + int s, ns, foo, error; +#endif + const char *service = "telnet"; + struct addrinfo hints, *res; + + if (argc > 1) { + usage(); + /* NOT REACHED */ + } else if (argc == 1) + service = *argv; + + memset(&hints, 0, sizeof(hints)); + hints.ai_flags = AI_PASSIVE; + hints.ai_family = family; + hints.ai_socktype = SOCK_STREAM; + hints.ai_protocol = 0; + error = getaddrinfo(NULL, service, &hints, &res); + + if (error) { + errx(1, "tcp/%s: %s\n", service, gai_strerror(error)); + if (error == EAI_SYSTEM) + errx(1, "tcp/%s: %s\n", service, strerror(errno)); + usage(); + } + + s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); + if (s < 0) + err(1, "socket"); + (void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR, + (char *)&on, sizeof(on)); + if (debug > 1) + (void) setsockopt(s, SOL_SOCKET, SO_DEBUG, + (char *)&on, sizeof(on)); + if (bind(s, res->ai_addr, res->ai_addrlen) < 0) + err(1, "bind"); + if (listen(s, 1) < 0) + err(1, "listen"); + foo = res->ai_addrlen; + ns = accept(s, res->ai_addr, &foo); + if (ns < 0) + err(1, "accept"); + (void) setsockopt(ns, SOL_SOCKET, SO_DEBUG, + (char *)&on, sizeof(on)); + (void) dup2(ns, 0); + (void) close(ns); + (void) close(s); +#ifdef convex + } else if (argc == 1) { + ; /* VOID*/ /* Just ignore the host/port name */ +#endif + } else if (argc > 0) { + usage(); + /* NOT REACHED */ + } + + openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON); + fromlen = sizeof (from); + if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) { + warn("getpeername"); + _exit(1); + } + if (keepalive && + setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, + (char *)&on, sizeof (on)) < 0) { + syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); + } + +#if defined(IPPROTO_IP) && defined(IP_TOS) + if (from.ss_family == AF_INET) { +# if defined(HAS_GETTOS) + struct tosent *tp; + if (tos < 0 && (tp = gettosbyname("telnet", "tcp"))) + tos = tp->t_tos; +# endif + if (tos < 0) + tos = 020; /* Low Delay bit */ + if (tos + && (setsockopt(0, IPPROTO_IP, IP_TOS, + (char *)&tos, sizeof(tos)) < 0) + && (errno != ENOPROTOOPT) ) + syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); + } +#endif /* defined(IPPROTO_IP) && defined(IP_TOS) */ + net = 0; + doit((struct sockaddr *)&from); + /* NOTREACHED */ + return(0); +} /* end of main */ + + void +usage() +{ + fprintf(stderr, "usage: telnetd"); +#ifdef AUTHENTICATION + fprintf(stderr, + " [-4] [-6] [-a (debug|other|user|valid|off|none)]\n\t"); +#endif +#ifdef BFTPDAEMON + fprintf(stderr, " [-B]"); +#endif + fprintf(stderr, " [-debug]"); +#ifdef DIAGNOSTICS + fprintf(stderr, " [-D (options|report|exercise|netdata|ptydata)]\n\t"); +#endif +#ifdef AUTHENTICATION + fprintf(stderr, " [-edebug]"); +#endif + fprintf(stderr, " [-h]"); +#if defined(LINEMODE) && defined(KLUDGELINEMODE) + fprintf(stderr, " [-k]"); +#endif +#ifdef LINEMODE + fprintf(stderr, " [-l]"); +#endif + fprintf(stderr, " [-n]"); + fprintf(stderr, "\n\t"); +#ifdef HAS_GETTOS + fprintf(stderr, " [-S tos]"); +#endif +#ifdef AUTHENTICATION + fprintf(stderr, " [-X auth-type]"); +#endif + fprintf(stderr, " [-u utmp_hostname_length] [-U]"); + fprintf(stderr, " [port]\n"); + exit(1); +} + +/* + * getterminaltype + * + * Ask the other end to send along its terminal type and speed. + * Output is the variable terminaltype filled in. + */ +static unsigned char ttytype_sbbuf[] = { + IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE +}; + + +#ifndef AUTHENTICATION +#define undef2 __unused +#else +#define undef2 +#endif + +static int +getterminaltype(char *name undef2) +{ + int retval = -1; + + settimer(baseline); +#ifdef AUTHENTICATION + /* + * Handle the Authentication option before we do anything else. + */ + send_do(TELOPT_AUTHENTICATION, 1); + while (his_will_wont_is_changing(TELOPT_AUTHENTICATION)) + ttloop(); + if (his_state_is_will(TELOPT_AUTHENTICATION)) { + retval = auth_wait(name); + } +#endif + +#ifdef ENCRYPTION + send_will(TELOPT_ENCRYPT, 1); +#endif /* ENCRYPTION */ + send_do(TELOPT_TTYPE, 1); + send_do(TELOPT_TSPEED, 1); + send_do(TELOPT_XDISPLOC, 1); + send_do(TELOPT_NEW_ENVIRON, 1); + send_do(TELOPT_OLD_ENVIRON, 1); + while ( +#ifdef ENCRYPTION + his_do_dont_is_changing(TELOPT_ENCRYPT) || +#endif /* ENCRYPTION */ + his_will_wont_is_changing(TELOPT_TTYPE) || + his_will_wont_is_changing(TELOPT_TSPEED) || + his_will_wont_is_changing(TELOPT_XDISPLOC) || + his_will_wont_is_changing(TELOPT_NEW_ENVIRON) || + his_will_wont_is_changing(TELOPT_OLD_ENVIRON)) { + ttloop(); + } +#ifdef ENCRYPTION + /* + * Wait for the negotiation of what type of encryption we can + * send with. If autoencrypt is not set, this will just return. + */ + if (his_state_is_will(TELOPT_ENCRYPT)) { + encrypt_wait(); + } +#endif /* ENCRYPTION */ + if (his_state_is_will(TELOPT_TSPEED)) { + static unsigned char sb[] = + { IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE }; + + output_datalen((char*)sb, sizeof sb); + DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); + } + if (his_state_is_will(TELOPT_XDISPLOC)) { + static unsigned char sb[] = + { IAC, SB, TELOPT_XDISPLOC, TELQUAL_SEND, IAC, SE }; + + output_datalen((char*)sb, sizeof sb); + DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); + } + if (his_state_is_will(TELOPT_NEW_ENVIRON)) { + static unsigned char sb[] = + { IAC, SB, TELOPT_NEW_ENVIRON, TELQUAL_SEND, IAC, SE }; + + output_datalen((char*)sb, sizeof sb); + DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); + } + else if (his_state_is_will(TELOPT_OLD_ENVIRON)) { + static unsigned char sb[] = + { IAC, SB, TELOPT_OLD_ENVIRON, TELQUAL_SEND, IAC, SE }; + + output_datalen((char*)sb, sizeof sb); + DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); + } + if (his_state_is_will(TELOPT_TTYPE)) { + + output_datalen((char*)ttytype_sbbuf, sizeof ttytype_sbbuf); + DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2, + sizeof ttytype_sbbuf - 2);); + } + if (his_state_is_will(TELOPT_TSPEED)) { + while (sequenceIs(tspeedsubopt, baseline)) + ttloop(); + } + if (his_state_is_will(TELOPT_XDISPLOC)) { + while (sequenceIs(xdisplocsubopt, baseline)) + ttloop(); + } + if (his_state_is_will(TELOPT_NEW_ENVIRON)) { + while (sequenceIs(environsubopt, baseline)) + ttloop(); + } + if (his_state_is_will(TELOPT_OLD_ENVIRON)) { + while (sequenceIs(oenvironsubopt, baseline)) + ttloop(); + } + if (his_state_is_will(TELOPT_TTYPE)) { + char first[256], last[256]; + + while (sequenceIs(ttypesubopt, baseline)) + ttloop(); + + /* + * If the other side has already disabled the option, then + * we have to just go with what we (might) have already gotten. + */ + if (his_state_is_will(TELOPT_TTYPE) && !terminaltypeok(terminaltype)) { + (void) strncpy(first, terminaltype, sizeof(first)-1); + first[sizeof(first)-1] = '\0'; + for(;;) { + /* + * Save the unknown name, and request the next name. + */ + (void) strncpy(last, terminaltype, sizeof(last)-1); + last[sizeof(last)-1] = '\0'; + _gettermname(); + if (terminaltypeok(terminaltype)) + break; + if ((strncmp(last, terminaltype, sizeof(last)) == 0) || + his_state_is_wont(TELOPT_TTYPE)) { + /* + * We've hit the end. If this is the same as + * the first name, just go with it. + */ + if (strncmp(first, terminaltype, sizeof(first)) == 0) + break; + /* + * Get the terminal name one more time, so that + * RFC1091 compliant telnets will cycle back to + * the start of the list. + */ + _gettermname(); + if (strncmp(first, terminaltype, sizeof(first)) != 0) { + (void) strncpy(terminaltype, first, sizeof(terminaltype)-1); + terminaltype[sizeof(terminaltype)-1] = '\0'; + } + break; + } + } + } + } + return(retval); +} /* end of getterminaltype */ + +static void +_gettermname(void) +{ + /* + * If the client turned off the option, + * we can't send another request, so we + * just return. + */ + if (his_state_is_wont(TELOPT_TTYPE)) + return; + settimer(baseline); + output_datalen((char*)ttytype_sbbuf, sizeof ttytype_sbbuf); + DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2, + sizeof ttytype_sbbuf - 2);); + while (sequenceIs(ttypesubopt, baseline)) + ttloop(); +} + +int +terminaltypeok(char *s) +{ + char buf[1024]; + + if (terminaltype == NULL) + return(1); + + /* + * tgetent() will return 1 if the type is known, and + * 0 if it is not known. If it returns -1, it couldn't + * open the database. But if we can't open the database, + * it won't help to say we failed, because we won't be + * able to verify anything else. So, we treat -1 like 1. + */ + if (tgetent(buf, s) == 0) + return(0); + return(1); +} + +#ifdef __APPLE__ +#ifndef MAXHOSTNAMELEN +#define MAXHOSTNAMELEN 256 +#endif /* MAXHOSTNAMELEN */ + +char *hostname; +char host_name[MAXHOSTNAMELEN]; + +int level; +char user_name[256]; +#endif /* __APPLE__ */ + +/* + * Get a pty, scan input lines. + */ +void +doit(struct sockaddr *who) +{ +#ifndef __APPLE__ + int err_; /* XXX */ +#else + char *host = NULL; + struct hostent *hp; +#endif + int ptynum; + + /* + * Find an available pty to use. + */ +#ifndef convex + spty = -1; + mpty = getpty(&ptynum, &spty); + if (mpty < 0) + fatal(net, "All network ports in use"); +#else + for (;;) { + char *lp; + + if ((lp = getpty()) == NULL) + fatal(net, "Out of ptys"); + + if ((pty = open(lp, 2)) >= 0) { + strlcpy(line,lp,sizeof(line)); + line[5] = 't'; + break; + } + } +#endif + +#ifdef __APPLE__ + /* get name of connected client */ + hp = gethostbyaddr((char *)&((struct sockaddr_in *)who)->sin_addr, sizeof (struct in_addr), + ((struct sockaddr_in *)who)->sin_family); + + if (hp == NULL && registerd_host_only) { + fatal(net, "Couldn't resolve your address into a host name.\r\n\ + Please contact your net administrator"); + } else if (hp && + (strlen(hp->h_name) <= utmp_len)) { + host = hp->h_name; + } else { + host = inet_ntoa(((struct sockaddr_in *)who)->sin_addr); + } + /* + * We must make a copy because Kerberos is probably going + * to also do a gethost* and overwrite the static data... + */ + strncpy(remote_hostname, host, sizeof(remote_hostname)-1); + remote_hostname[sizeof(remote_hostname)-1] = 0; + host = remote_hostname; + + (void) gethostname(host_name, sizeof(host_name) - 1); + host_name[sizeof(host_name) - 1] = '\0'; + hostname = host_name; +#else /* __APPLE__ */ + /* get name of connected client */ + if (realhostname_sa(remote_hostname, sizeof(remote_hostname) - 1, + who, who->sa_len) == HOSTNAME_INVALIDADDR && registerd_host_only) + fatal(net, "Couldn't resolve your address into a host name.\r\n\ + Please contact your net administrator"); + remote_hostname[sizeof(remote_hostname) - 1] = '\0'; + + trimdomain(remote_hostname, UT_HOSTSIZE); + if (!isdigit(remote_hostname[0]) && strlen(remote_hostname) > utmp_len) + err_ = getnameinfo(who, who->sa_len, remote_hostname, + sizeof(remote_hostname), NULL, 0, + NI_NUMERICHOST); + /* XXX: do 'err_' check */ + + (void) gethostname(host_name, sizeof(host_name) - 1); + host_name[sizeof(host_name) - 1] = '\0'; + hostname = host_name; +#endif /* __APPLE__ */ + +#ifdef AUTHENTICATION +#ifdef ENCRYPTION +/* The above #ifdefs should actually be "or"'ed, not "and"'ed. + * This is a byproduct of needing "#ifdef" and not "#if defined()" + * for unifdef. XXX MarkM + */ + auth_encrypt_init(hostname, remote_hostname, "TELNETD", 1); +#endif +#endif + + init_env(); + /* + * get terminal type. + */ + *user_name = 0; + level = getterminaltype(user_name); + setenv("TERM", terminaltype ? terminaltype : "network", 1); + + telnet(net, mpty, remote_hostname); /* begin server process */ + + /*NOTREACHED*/ +} /* end of doit */ + +/* + * Main loop. Select from pty and network, and + * hand data to telnet receiver finite state machine. + */ +void +telnet(int f, int p, char *host) +{ + int on = 1; +#define TABBUFSIZ 512 + char defent[TABBUFSIZ]; + char defstrs[TABBUFSIZ]; +#undef TABBUFSIZ + char *HE; + char *HN; + char *IM; +#ifdef __APPLE__ + char *IF = NULL; + int if_fd = -1; + char *if_buf; + struct stat statbuf; +#endif + int nfd; + + /* + * Initialize the slc mapping table. + */ + get_slc_defaults(); + + /* + * Do some tests where it is desireable to wait for a response. + * Rather than doing them slowly, one at a time, do them all + * at once. + */ + if (my_state_is_wont(TELOPT_SGA)) + send_will(TELOPT_SGA, 1); + /* + * Is the client side a 4.2 (NOT 4.3) system? We need to know this + * because 4.2 clients are unable to deal with TCP urgent data. + * + * To find out, we send out a "DO ECHO". If the remote system + * answers "WILL ECHO" it is probably a 4.2 client, and we note + * that fact ("WILL ECHO" ==> that the client will echo what + * WE, the server, sends it; it does NOT mean that the client will + * echo the terminal input). + */ + send_do(TELOPT_ECHO, 1); + +#ifdef LINEMODE + if (his_state_is_wont(TELOPT_LINEMODE)) { + /* Query the peer for linemode support by trying to negotiate + * the linemode option. + */ + linemode = 0; + editmode = 0; + send_do(TELOPT_LINEMODE, 1); /* send do linemode */ + } +#endif /* LINEMODE */ + + /* + * Send along a couple of other options that we wish to negotiate. + */ + send_do(TELOPT_NAWS, 1); + send_will(TELOPT_STATUS, 1); + flowmode = 1; /* default flow control state */ + restartany = -1; /* uninitialized... */ + send_do(TELOPT_LFLOW, 1); + + /* + * Spin, waiting for a response from the DO ECHO. However, + * some REALLY DUMB telnets out there might not respond + * to the DO ECHO. So, we spin looking for NAWS, (most dumb + * telnets so far seem to respond with WONT for a DO that + * they don't understand...) because by the time we get the + * response, it will already have processed the DO ECHO. + * Kludge upon kludge. + */ + while (his_will_wont_is_changing(TELOPT_NAWS)) + ttloop(); + + /* + * But... + * The client might have sent a WILL NAWS as part of its + * startup code; if so, we'll be here before we get the + * response to the DO ECHO. We'll make the assumption + * that any implementation that understands about NAWS + * is a modern enough implementation that it will respond + * to our DO ECHO request; hence we'll do another spin + * waiting for the ECHO option to settle down, which is + * what we wanted to do in the first place... + */ + if (his_want_state_is_will(TELOPT_ECHO) && + his_state_is_will(TELOPT_NAWS)) { + while (his_will_wont_is_changing(TELOPT_ECHO)) + ttloop(); + } + /* + * On the off chance that the telnet client is broken and does not + * respond to the DO ECHO we sent, (after all, we did send the + * DO NAWS negotiation after the DO ECHO, and we won't get here + * until a response to the DO NAWS comes back) simulate the + * receipt of a will echo. This will also send a WONT ECHO + * to the client, since we assume that the client failed to + * respond because it believes that it is already in DO ECHO + * mode, which we do not want. + */ + if (his_want_state_is_will(TELOPT_ECHO)) { + DIAG(TD_OPTIONS, output_data("td: simulating recv\r\n")); + willoption(TELOPT_ECHO); + } + + /* + * Finally, to clean things up, we turn on our echo. This + * will break stupid 4.2 telnets out of local terminal echo. + */ + + if (my_state_is_wont(TELOPT_ECHO)) + send_will(TELOPT_ECHO, 1); + + /* + * Turn on packet mode + */ + (void) ioctl(p, TIOCPKT, (char *)&on); + +#if defined(LINEMODE) && defined(KLUDGELINEMODE) + /* + * Continuing line mode support. If client does not support + * real linemode, attempt to negotiate kludge linemode by sending + * the do timing mark sequence. + */ + if (lmodetype < REAL_LINEMODE) + send_do(TELOPT_TM, 1); +#endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */ + + /* + * Call telrcv() once to pick up anything received during + * terminal type negotiation, 4.2/4.3 determination, and + * linemode negotiation. + */ + telrcv(); + + (void) ioctl(f, FIONBIO, (char *)&on); + (void) ioctl(p, FIONBIO, (char *)&on); + +#if defined(SO_OOBINLINE) + (void) setsockopt(net, SOL_SOCKET, SO_OOBINLINE, + (char *)&on, sizeof on); +#endif /* defined(SO_OOBINLINE) */ + +#ifdef SIGTSTP + (void) signal(SIGTSTP, SIG_IGN); +#endif +#ifdef SIGTTOU + /* + * Ignoring SIGTTOU keeps the kernel from blocking us + * in ttioct() in /sys/tty.c. + */ + (void) signal(SIGTTOU, SIG_IGN); +#endif + + (void) signal(SIGCHLD, cleanup); + +#ifdef TIOCNOTTY + { + int t; + t = open(_PATH_TTY, O_RDWR); + if (t >= 0) { + (void) ioctl(t, TIOCNOTTY, (char *)0); + (void) close(t); + } + } +#endif + + /* + * Show banner that getty never gave. + * + * We put the banner in the pty input buffer. This way, it + * gets carriage return null processing, etc., just like all + * other pty --> client data. + */ + +#ifdef __APPLE__ + if (getenv("USER")) + hostinfo = 0; +#endif + if (getent(defent, "default") == 1) { + char *cp=defstrs; + + HE = Getstr("he", &cp); + HN = Getstr("hn", &cp); + IM = Getstr("im", &cp); +#ifdef __APPLE__ + IF = Getstr("if", &cp); +#endif + if (HN && *HN) + (void) strlcpy(host_name, HN, sizeof(host_name)); +#ifdef __APPLE__ + if (IF && (if_fd = open(IF, O_RDONLY, 000)) != -1) + IM = 0; +#endif + if (IM == 0) + IM = strdup(""); + } else { + IM = strdup(DEFAULT_IM); + HE = 0; + } + edithost(HE, host_name); + if (hostinfo && *IM) + putf(IM, ptyibuf2); +#ifdef __APPLE__ + else if (IF && if_fd != -1) { + fstat (if_fd, &statbuf); + if_buf = (char *) mmap (0, statbuf.st_size, PROT_READ, + 0, if_fd, 0); + putf(if_buf, ptyibuf2); + munmap (if_buf, statbuf.st_size); + close (if_fd); + } +#endif + + if (pcc) + (void) strncat(ptyibuf2, ptyip, pcc+1); + ptyip = ptyibuf2; + pcc = strlen(ptyip); +#ifdef LINEMODE + /* + * Last check to make sure all our states are correct. + */ + init_termbuf(); + localstat(); +#endif /* LINEMODE */ + + DIAG(TD_REPORT, output_data("td: Entering processing loop\r\n")); + + /* + * Startup the login process on the slave side of the terminal + * now. We delay this until here to insure option negotiation + * is complete. + */ + startslave(host, level, user_name); + + nfd = ((f > p) ? f : p) + 1; + for (;;) { + fd_set ibits, obits, xbits; + int c; + + if (ncc < 0 && pcc < 0) + break; + + FD_ZERO(&ibits); + FD_ZERO(&obits); + FD_ZERO(&xbits); + /* + * Never look for input if there's still + * stuff in the corresponding output buffer + */ + if (nfrontp - nbackp || pcc > 0) { + FD_SET(f, &obits); + } else { + FD_SET(p, &ibits); + } + if (pfrontp - pbackp || ncc > 0) { + FD_SET(p, &obits); + } else { + FD_SET(f, &ibits); + } + if (!SYNCHing) { + FD_SET(f, &xbits); + } + if ((c = select(nfd, &ibits, &obits, &xbits, + (struct timeval *)0)) < 1) { + if (c == -1) { + if (errno == EINTR) { + continue; + } + } + sleep(5); + continue; + } + + /* + * Any urgent data? + */ + if (FD_ISSET(net, &xbits)) { + SYNCHing = 1; + } + + /* + * Something to read from the network... + */ + if (FD_ISSET(net, &ibits)) { +#if !defined(SO_OOBINLINE) + /* + * In 4.2 (and 4.3 beta) systems, the + * OOB indication and data handling in the kernel + * is such that if two separate TCP Urgent requests + * come in, one byte of TCP data will be overlaid. + * This is fatal for Telnet, but we try to live + * with it. + * + * In addition, in 4.2 (and...), a special protocol + * is needed to pick up the TCP Urgent data in + * the correct sequence. + * + * What we do is: if we think we are in urgent + * mode, we look to see if we are "at the mark". + * If we are, we do an OOB receive. If we run + * this twice, we will do the OOB receive twice, + * but the second will fail, since the second + * time we were "at the mark", but there wasn't + * any data there (the kernel doesn't reset + * "at the mark" until we do a normal read). + * Once we've read the OOB data, we go ahead + * and do normal reads. + * + * There is also another problem, which is that + * since the OOB byte we read doesn't put us + * out of OOB state, and since that byte is most + * likely the TELNET DM (data mark), we would + * stay in the TELNET SYNCH (SYNCHing) state. + * So, clocks to the rescue. If we've "just" + * received a DM, then we test for the + * presence of OOB data when the receive OOB + * fails (and AFTER we did the normal mode read + * to clear "at the mark"). + */ + if (SYNCHing) { + int atmark; + + (void) ioctl(net, SIOCATMARK, (char *)&atmark); + if (atmark) { + ncc = recv(net, netibuf, sizeof (netibuf), MSG_OOB); + if ((ncc == -1) && (errno == EINVAL)) { + ncc = read(net, netibuf, sizeof (netibuf)); + if (sequenceIs(didnetreceive, gotDM)) { + SYNCHing = stilloob(net); + } + } + } else { + ncc = read(net, netibuf, sizeof (netibuf)); + } + } else { + ncc = read(net, netibuf, sizeof (netibuf)); + } + settimer(didnetreceive); +#else /* !defined(SO_OOBINLINE)) */ + ncc = read(net, netibuf, sizeof (netibuf)); +#endif /* !defined(SO_OOBINLINE)) */ + if (ncc < 0 && errno == EWOULDBLOCK) + ncc = 0; + else { + if (ncc <= 0) { + break; + } + netip = netibuf; + } + DIAG((TD_REPORT | TD_NETDATA), + output_data("td: netread %d chars\r\n", ncc)); + DIAG(TD_NETDATA, printdata("nd", netip, ncc)); + } + + /* + * Something to read from the pty... + */ + if (FD_ISSET(p, &ibits)) { + pcc = read(p, ptyibuf, BUFSIZ); + /* + * On some systems, if we try to read something + * off the master side before the slave side is + * opened, we get EIO. + */ + if (pcc < 0 && (errno == EWOULDBLOCK || +#ifdef EAGAIN + errno == EAGAIN || +#endif + errno == EIO)) { + pcc = 0; + } else { + if (pcc <= 0) + break; +#ifdef LINEMODE + /* + * If ioctl from pty, pass it through net + */ + if (ptyibuf[0] & TIOCPKT_IOCTL) { + copy_termbuf(ptyibuf+1, pcc-1); + localstat(); + pcc = 1; + } +#endif /* LINEMODE */ + if (ptyibuf[0] & TIOCPKT_FLUSHWRITE) { + netclear(); /* clear buffer back */ +#ifndef NO_URGENT + /* + * There are client telnets on some + * operating systems get screwed up + * royally if we send them urgent + * mode data. + */ + output_data("%c%c", IAC, DM); + neturg = nfrontp-1; /* off by one XXX */ + DIAG(TD_OPTIONS, + printoption("td: send IAC", DM)); + +#endif + } + if (his_state_is_will(TELOPT_LFLOW) && + (ptyibuf[0] & + (TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) { + int newflow = + ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0; + if (newflow != flowmode) { + flowmode = newflow; + output_data("%c%c%c%c%c%c", + IAC, SB, TELOPT_LFLOW, + flowmode ? LFLOW_ON + : LFLOW_OFF, + IAC, SE); + DIAG(TD_OPTIONS, printsub('>', + (unsigned char *)nfrontp-4, + 4);); + } + } + pcc--; + ptyip = ptyibuf+1; + } + } + + while (pcc > 0) { + if ((&netobuf[BUFSIZ] - nfrontp) < 2) + break; + c = *ptyip++ & 0377, pcc--; + if (c == IAC) + output_data("%c", c); + output_data("%c", c); + if ((c == '\r') && (my_state_is_wont(TELOPT_BINARY))) { + if (pcc > 0 && ((*ptyip & 0377) == '\n')) { + output_data("%c", *ptyip++ & 0377); + pcc--; + } else + output_data("%c", '\0'); + } + } + + if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0) + netflush(); + if (ncc > 0) + telrcv(); + if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0) + ptyflush(); + } + cleanup(0); +} /* end of telnet */ + +#ifndef TCSIG +# ifdef TIOCSIG +# define TCSIG TIOCSIG +# endif +#endif + +/* + * Send interrupt to process on other side of pty. + * If it is in raw mode, just write NULL; + * otherwise, write intr char. + */ +void +interrupt(void) +{ + ptyflush(); /* half-hearted */ + +#ifdef TCSIG + (void) ioctl(mpty, TCSIG, (char *)SIGINT); +#else /* TCSIG */ + init_termbuf(); + *pfrontp++ = slctab[SLC_IP].sptr ? + (unsigned char)*slctab[SLC_IP].sptr : '\177'; +#endif /* TCSIG */ +} + +/* + * Send quit to process on other side of pty. + * If it is in raw mode, just write NULL; + * otherwise, write quit char. + */ +void +sendbrk(void) +{ + ptyflush(); /* half-hearted */ +#ifdef TCSIG + (void) ioctl(mpty, TCSIG, (char *)SIGQUIT); +#else /* TCSIG */ + init_termbuf(); + *pfrontp++ = slctab[SLC_ABORT].sptr ? + (unsigned char)*slctab[SLC_ABORT].sptr : '\034'; +#endif /* TCSIG */ +} + +void +sendsusp(void) +{ +#ifdef SIGTSTP + ptyflush(); /* half-hearted */ +# ifdef TCSIG + (void) ioctl(mpty, TCSIG, (char *)SIGTSTP); +# else /* TCSIG */ + *pfrontp++ = slctab[SLC_SUSP].sptr ? + (unsigned char)*slctab[SLC_SUSP].sptr : '\032'; +# endif /* TCSIG */ +#endif /* SIGTSTP */ +} + +/* + * When we get an AYT, if ^T is enabled, use that. Otherwise, + * just send back "[Yes]". + */ +void +recv_ayt(void) +{ +#if defined(SIGINFO) && defined(TCSIG) + if (slctab[SLC_AYT].sptr && *slctab[SLC_AYT].sptr != _POSIX_VDISABLE) { + (void) ioctl(spty, TCSIG, (char *)SIGINFO); + return; + } +#endif + output_data("\r\n[Yes]\r\n"); +} + +void +doeof(void) +{ + init_termbuf(); + +#if defined(LINEMODE) && defined(USE_TERMIO) && (VEOF == VMIN) + if (!tty_isediting()) { + extern char oldeofc; + *pfrontp++ = oldeofc; + return; + } +#endif + *pfrontp++ = slctab[SLC_EOF].sptr ? + (unsigned char)*slctab[SLC_EOF].sptr : '\004'; +} |