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-rw-r--r--WWW/Library/Implementation/HTTelnet.c553
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diff --git a/WWW/Library/Implementation/HTTelnet.c b/WWW/Library/Implementation/HTTelnet.c
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+/*
+ * $LynxId: HTTelnet.c,v 1.41 2013/11/28 11:15:19 tom Exp $
+ *
+ * Telnet Access, Rlogin, etc HTTelnet.c
+ * ==========================
+ *
+ * Authors
+ * TBL Tim Berners-Lee timbl@info.cern.ch
+ * JFG Jean-Francois Groff jgh@next.com
+ * DD Denis DeLaRoca (310) 825-4580 <CSP1DWD@mvs.oac.ucla.edu>
+ * History
+ * 8 Jun 92 Telnet hopping prohibited as telnet is not secure (TBL)
+ * 26 Jun 92 When over DECnet, suppressed FTP, Gopher and News. (JFG)
+ * 6 Oct 92 Moved HTClientHost and logfile into here. (TBL)
+ * 17 Dec 92 Tn3270 added, bug fix. (DD)
+ * 2 Feb 93 Split from HTAccess.c. Registration.(TBL)
+ */
+
+#include <HTUtils.h>
+#include <LYUtils.h>
+
+/* Implements:
+*/
+#include <HTTelnet.h>
+
+#include <HTParse.h>
+#include <HTAnchor.h>
+#include <HTTP.h>
+#include <HTFile.h>
+
+#include <HTTCP.h>
+#include <HText.h>
+
+#include <HTAccess.h>
+#include <HTAlert.h>
+
+#include <LYStrings.h>
+#include <LYClean.h>
+#include <LYLeaks.h>
+
+#ifdef __GNUC__
+static void do_system(char *) GCC_UNUSED;
+#endif
+
+static void do_system(char *command)
+{
+ if (non_empty(command)) {
+ CTRACE((tfp, "HTTelnet: Command is: %s\n\n", command));
+ LYSystem(command);
+ }
+ FREE(command);
+}
+
+/* Telnet or "rlogin" access
+ * -------------------------
+ */
+static int remote_session(char *acc_method, char *host)
+{
+ const char *program;
+ char *user = host;
+ char *password = NULL;
+ char *cp;
+ char *hostname;
+ char *port;
+ char *command = NULL;
+ enum _login_protocol {
+ telnet,
+ rlogin,
+ tn3270
+ } login_protocol =
+ strcmp(acc_method, "rlogin") == 0 ? rlogin :
+ strcmp(acc_method, "tn3270") == 0 ? tn3270 : telnet;
+
+ /*
+ * Modified to allow for odd chars in a username only if exists.
+ * 05-28-94 Lynx 2-3-1 Garrett Arch Blythe
+ */
+ /* prevent telnet://hostname;rm -rf * URL's (VERY BAD)
+ * *cp=0; // terminate at any ;,<,>,`,|,",' or space or return
+ * or tab to prevent security hole
+ */
+ for (cp = (StrChr(host, '@') ? StrChr(host, '@') : host); *cp != '\0';
+ cp++) {
+ if (!isalnum(UCH(*cp)) && *cp != '_' && *cp != '-' &&
+ *cp != ':' && *cp != '.' && *cp != '@') {
+ *cp = '\0';
+ break;
+ }
+ }
+
+ hostname = StrChr(host, '@');
+
+ if (hostname) {
+ *hostname++ = '\0'; /* Split */
+ } else {
+ hostname = host;
+ user = NULL; /* No user specified */
+ }
+
+ port = StrChr(hostname, ':');
+ if (port)
+ *port++ = '\0'; /* Split */
+
+ if (*hostname == '\0') {
+ CTRACE((tfp, "HTTelnet: No host specified!\n"));
+ return HT_NO_DATA;
+ } else if (!valid_hostname(hostname)) {
+ char *prefix = NULL;
+ char *line = NULL;
+
+ CTRACE((tfp, "HTTelnet: Invalid hostname %s!\n", host));
+ HTSprintf0(&prefix,
+ gettext("remote %s session:"), acc_method);
+ HTSprintf0(&line,
+ gettext("Invalid hostname %s"), host);
+ HTAlwaysAlert(prefix, line);
+ FREE(prefix);
+ FREE(line);
+ return HT_NO_DATA;
+ }
+
+ if (user) {
+ password = StrChr(user, ':');
+ if (password) {
+ *password++ = '\0';
+ }
+ }
+
+ /* If the person is already telnetting etc, forbid hopping */
+ /* This is a security precaution, for us and remote site */
+
+ if (HTSecure) {
+
+#ifdef TELNETHOPPER_MAIL
+ HTSprintf0(&command,
+ "finger @%s | mail -s \"**telnethopper %s\" tbl@dxcern.cern.ch",
+ HTClientHost, HTClientHost);
+ do_system(command);
+#endif
+ printf("\n\nSorry, but the service you have selected is one\n");
+ printf("to which you have to log in. If you were running www\n");
+ printf("on your own computer, you would be automatically connected.\n");
+ printf("For security reasons, this is not allowed when\n");
+ printf("you log in to this information service remotely.\n\n");
+
+ printf("You can manually connect to this service using %s\n",
+ acc_method);
+ printf("to host %s", hostname);
+ if (user)
+ printf(", user name %s", user);
+ if (password)
+ printf(", password %s", password);
+ if (port)
+ printf(", port %s", port);
+ printf(".\n\n");
+ return HT_NO_DATA;
+ }
+
+ /* Not all telnet servers get it even if user name is specified so we
+ * always tell the guy what to log in as.
+ */
+ if (user && login_protocol != rlogin)
+ printf("When you are connected, log in as: %s\n", user);
+ if (password && login_protocol != rlogin)
+ printf(" The password is: %s\n", password);
+ fflush(stdout);
+
+/*
+ * NeXTSTEP is the implied version of the NeXT operating system.
+ * You may need to define this yourself.
+ */
+#if !defined(TELNET_DONE) && (defined(NeXT) && defined(NeXTSTEP) && NeXTSTEP<=20100)
+#define FMT_TELNET "%s%s%s %s %s"
+
+ if ((program = HTGetProgramPath(ppTELNET)) != NULL) {
+ HTAddParam(&command, FMT_TELNET, 1, program);
+ HTOptParam(&command, FMT_TELNET, 2, user ? " -l " : "");
+ HTAddParam(&command, FMT_TELNET, 3, user);
+ HTAddParam(&command, FMT_TELNET, 4, hostname);
+ HTAddParam(&command, FMT_TELNET, 5, port);
+ HTEndParam(&command, FMT_TELNET, 5);
+ }
+ do_system(command);
+#define TELNET_DONE
+#endif
+
+/* Most unix machines support username only with rlogin */
+#if !defined(TELNET_DONE) && (defined(UNIX) || defined(DOSPATH) || defined(__CYGWIN__))
+
+#define FMT_RLOGIN "%s %s%s%s"
+#define FMT_TN3270 "%s %s %s"
+#define FMT_TELNET "%s %s %s"
+
+ switch (login_protocol) {
+ case rlogin:
+ if ((program = HTGetProgramPath(ppRLOGIN)) != NULL) {
+ HTAddParam(&command, FMT_RLOGIN, 1, program);
+ HTAddParam(&command, FMT_RLOGIN, 2, hostname);
+ HTOptParam(&command, FMT_RLOGIN, 3, user ? " -l " : "");
+ HTAddParam(&command, FMT_RLOGIN, 4, user);
+ HTEndParam(&command, FMT_RLOGIN, 4);
+ }
+ break;
+
+ case tn3270:
+ if ((program = HTGetProgramPath(ppTN3270)) != NULL) {
+ HTAddParam(&command, FMT_TN3270, 1, program);
+ HTAddParam(&command, FMT_TN3270, 2, hostname);
+ HTAddParam(&command, FMT_TN3270, 3, port);
+ HTEndParam(&command, FMT_TN3270, 3);
+ }
+ break;
+
+ case telnet:
+ if ((program = HTGetProgramPath(ppTELNET)) != NULL) {
+ HTAddParam(&command, FMT_TELNET, 1, program);
+ HTAddParam(&command, FMT_TELNET, 2, hostname);
+ HTAddParam(&command, FMT_TELNET, 3, port);
+ HTEndParam(&command, FMT_TELNET, 3);
+ }
+ break;
+ }
+
+ LYSystem(command);
+#define TELNET_DONE
+#endif /* unix */
+
+/* VMS varieties */
+#if !defined(TELNET_DONE) && (defined(MULTINET))
+ if (login_protocol == rlogin) {
+ HTSprintf0(&command, "RLOGIN%s%s%s%s%s %s", /*lm 930713 */
+ user ? "/USERNAME=\"" : "",
+ NonNull(user),
+ user ? "\"" : "",
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+
+ } else if (login_protocol == tn3270) {
+ HTSprintf0(&command, "TELNET/TN3270 %s%s %s",
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+
+ } else { /* TELNET */
+ HTSprintf0(&command, "TELNET %s%s %s",
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+ }
+
+ do_system(command);
+#define TELNET_DONE
+#endif /* MULTINET */
+
+#if !defined(TELNET_DONE) && defined(WIN_TCP)
+ if ((cp = getenv("WINTCP_COMMAND_STYLE")) != NULL &&
+ 0 == strncasecomp(cp, "VMS", 3)) { /* VMS command syntax */
+ if (login_protocol == rlogin) {
+ HTSprintf0(&command, "RLOGIN%s%s%s%s%s %s", /*lm 930713 */
+ user ? "/USERNAME=\"" : "",
+ NonNull(user),
+ user ? "\"" : "",
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+
+ } else if (login_protocol == tn3270) {
+ HTSprintf0(&command, "TELNET/TN3270 %s%s %s",
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+
+ } else { /* TELNET */
+ HTSprintf0(&command, "TELNET %s%s %s",
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+ }
+
+ } else { /* UNIX command syntax */
+ if (login_protocol == rlogin) {
+ HTSprintf0(&command, "RLOGIN %s%s%s%s%s",
+ hostname,
+ user ? " -l " : "",
+ user ? "\"" : "",
+ NonNull(user),
+ user ? "\"" : "");
+
+ } else if (login_protocol == tn3270) {
+ HTSprintf0(&command, "TN3270 %s %s",
+ hostname,
+ NonNull(port));
+
+ } else { /* TELNET */
+ HTSprintf0(&command, "TELNET %s %s",
+ hostname,
+ NonNull(port));
+ }
+ }
+
+ do_system(command);
+#define TELNET_DONE
+#endif /* WIN_TCP */
+
+#if !defined(TELNET_DONE) && defined(UCX)
+ if (login_protocol == rlogin) {
+ HTSprintf0(&command, "RLOGIN%s%s%s %s %s",
+ user ? "/USERNAME=\"" : "",
+ NonNull(user),
+ user ? "\"" : "",
+ hostname,
+ NonNull(port));
+
+ } else if (login_protocol == tn3270) {
+ HTSprintf0(&command, "TN3270 %s %s",
+ hostname,
+ NonNull(port));
+
+ } else { /* TELNET */
+ HTSprintf0(&command, "TELNET %s %s",
+ hostname,
+ NonNull(port));
+ }
+
+ do_system(command);
+#define TELNET_DONE
+#endif /* UCX */
+
+#if !defined(TELNET_DONE) && defined(CMU_TCP)
+ if (login_protocol == telnet) {
+ HTSprintf0(&command, "TELNET %s%s %s",
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+ do_system(command);
+ } else {
+ printf("\nSorry, this browser was compiled without the %s access option.\n",
+ acc_method);
+ printf("\nPress <return> to return to Lynx.");
+ LYgetch();
+ HadVMSInterrupt = FALSE;
+ }
+#define TELNET_DONE
+#endif /* CMU_TCP */
+
+#if !defined(TELNET_DONE) && defined(SOCKETSHR_TCP)
+ if (getenv("MULTINET_SOCKET_LIBRARY") != NULL) {
+ if (login_protocol == rlogin) {
+ HTSprintf0(&command, "MULTINET RLOGIN%s%s%s%s %s", /*lm 930713 */
+ user ? "/USERNAME=" : "",
+ NonNull(user),
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+
+ } else if (login_protocol == tn3270) {
+ HTSprintf0(&command, "MULTINET TELNET/TN3270 %s%s %s",
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+
+ } else { /* TELNET */
+ HTSprintf0(&command, "MULTINET TELNET %s%s %s",
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+ }
+
+ do_system(command);
+ return HT_NO_DATA; /* Ok - it was done but no data */
+ } else if ((cp = getenv("WINTCP_COMMAND_STYLE")) != NULL) {
+ if (0 == strncasecomp(cp, "VMS", 3)) { /* VMS command syntax */
+ if (login_protocol == rlogin) {
+ HTSprintf0(&command, "RLOGIN%s%s%s%s %s", /*lm 930713 */
+ user ? "/USERNAME=" : "",
+ NonNull(user),
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+ } else if (login_protocol == tn3270) {
+ HTSprintf0(&command, "TELNET/TN3270 %s%s %s",
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+ } else { /* TELNET */
+ HTSprintf0(&command, "TELNET %s%s %s",
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+ }
+ } else { /* UNIX command syntax */
+ if (login_protocol == rlogin) {
+ HTSprintf0(&command, "RLOGIN %s%s%s",
+ hostname,
+ user ? " -l " : "",
+ NonNull(user));
+ } else if (login_protocol == tn3270) {
+ HTSprintf0(&command, "TN3270 %s %s",
+ hostname,
+ NonNull(port));
+ } else { /* TELNET */
+ HTSprintf0(&command, "TELNET %s %s",
+ hostname,
+ NonNull(port));
+ }
+ }
+
+ do_system(command);
+ return HT_NO_DATA; /* Ok - it was done but no data */
+ } else if (getenv("UCX$DEVICE") != NULL
+ || getenv("TCPIP$DEVICE") != NULL) {
+ if (login_protocol == rlogin) {
+ HTSprintf0(&command, "RLOGIN%s%s %s %s",
+ user ? "/USERNAME=" : "",
+ NonNull(user),
+ hostname,
+ NonNull(port));
+
+ } else if (login_protocol == tn3270) {
+ HTSprintf0(&command, "TN3270 %s %s",
+ hostname,
+ NonNull(port));
+
+ } else { /* TELNET */
+ HTSprintf0(&command, "TELNET %s %s",
+ hostname,
+ NonNull(port));
+ }
+
+ do_system(command);
+ return HT_NO_DATA; /* Ok - it was done but no data */
+ } else if (getenv("CMUTEK_ROOT") != NULL) {
+ if (login_protocol == telnet) {
+ HTSprintf0(&command, "TELNET %s%s %s",
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+ do_system(command);
+ } else {
+ printf("\nSorry, this browser was compiled without the %s access option.\n",
+ acc_method);
+ printf("\nPress <return> to return to Lynx.");
+ LYgetch();
+ HadVMSInterrupt = FALSE;
+ }
+ } else {
+ if (login_protocol == telnet) {
+ HTSprintf0(&command, "TELNET %s%s %s",
+ port ? "/PORT=" : "",
+ NonNull(port),
+ hostname);
+ do_system(command);
+ } else {
+ printf("\nSorry, this browser was compiled without the %s access option.\n",
+ acc_method);
+ printf("\nPress <return> to return to Lynx.");
+ LYgetch();
+ HadVMSInterrupt = FALSE;
+ }
+ }
+#define TELNET_DONE
+#endif /* SOCKETSHR_TCP */
+
+#if !defined(TELNET_DONE) && (defined(SIMPLE_TELNET) || defined(VM))
+ if (login_protocol == telnet) { /* telnet only */
+ HTSprintf0(&command, "TELNET %s", /* @@ Bug: port ignored */
+ hostname);
+ do_system(command);
+ return HT_NO_DATA; /* Ok - it was done but no data */
+ }
+#define TELNET_DONE
+#endif
+
+#ifndef TELNET_DONE
+ printf("\nSorry, this browser was compiled without the %s access option.\n",
+ acc_method);
+ printf("\nTo access the information you must %s to %s", acc_method, hostname);
+ if (port)
+ printf(" (port %s)", port);
+ if (user)
+ printf("\nlogging in with username %s", user);
+ printf(".\n");
+ {
+ printf("\nPress <return> to return to Lynx.");
+ fflush(stdout);
+ LYgetch();
+#ifdef VMS
+ HadVMSInterrupt = FALSE;
+#endif /* VMS */
+ }
+#endif /* !TELNET_DONE */
+ return HT_NO_DATA;
+}
+
+/* "Load a document" -- establishes a session
+ * ------------------------------------------
+ *
+ * On entry,
+ * addr must point to the fully qualified hypertext reference.
+ *
+ * On exit,
+ * returns <0 Error has occurred.
+ * >=0 Value of file descriptor or socket to be used
+ * to read data.
+ * *pFormat Set to the format of the file, if known.
+ * (See WWW.h)
+ *
+ */
+static int HTLoadTelnet(const char *addr,
+ HTParentAnchor *anchor GCC_UNUSED,
+ HTFormat format_out GCC_UNUSED,
+ HTStream *sink) /* Ignored */
+{
+ char *acc_method;
+ char *host;
+ int status;
+
+ if (sink) {
+ CTRACE((tfp,
+ "HTTelnet: Can't output a live session -- must be interactive!\n"));
+ return HT_NO_DATA;
+ }
+ acc_method = HTParse(addr, STR_FILE_URL, PARSE_ACCESS);
+
+ host = HTParse(addr, "", PARSE_HOST);
+ if (!host || *host == '\0') {
+ status = HT_NO_DATA;
+ CTRACE((tfp, "HTTelnet: No host specified!\n"));
+ } else {
+ status = remote_session(acc_method, host);
+ }
+
+ FREE(host);
+ FREE(acc_method);
+ return status;
+}
+
+#ifdef GLOBALDEF_IS_MACRO
+#define _HTTELNET_C_1_INIT { "telnet", HTLoadTelnet, NULL }
+#define _HTTELNET_C_2_INIT { "rlogin", HTLoadTelnet, NULL }
+#define _HTTELNET_C_3_INIT { "tn3270", HTLoadTelnet, NULL }
+GLOBALDEF(HTProtocol, HTTelnet, _HTTELNET_C_1_INIT);
+GLOBALDEF(HTProtocol, HTRlogin, _HTTELNET_C_2_INIT);
+GLOBALDEF(HTProtocol, HTTn3270, _HTTELNET_C_3_INIT);
+#else
+GLOBALDEF HTProtocol HTTelnet =
+{"telnet", HTLoadTelnet, NULL};
+GLOBALDEF HTProtocol HTRlogin =
+{"rlogin", HTLoadTelnet, NULL};
+GLOBALDEF HTProtocol HTTn3270 =
+{"tn3270", HTLoadTelnet, NULL};
+#endif /* GLOBALDEF_IS_MACRO */
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