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- /* Telnet Acees, Roligin, etc HTAccess.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)
- */
-
- /* Implements:
- */
- #include"capalloc.h"
- #include "HTTelnet.h"
- #include"capstdio.h"
-
- #include "HTParse.h"
- #include "HTUtils.h"
- #include "HTAnchor.h"
- #include "HTTP.h"
- #include "HTFile.h"
- #include <errno.h>
- #include <stdio.h>
-
- #include "tcp.h"
- #include "HText.h"
-
- #include "HTAccess.h"
- #include "HTAlert.h"
-
- #define HT_NO_DATA -9999
-
-
- /* Telnet or "rlogin" access
- ** -------------------------
- */
- PRIVATE int remote_session ARGS2(char *, access, char *, host)
- {
- char * user = host;
- char * hostname = strchr(host, '@');
- char * port = strchr(host, ':');
- char command[256];
- enum _login_protocol { telnet, rlogin, tn3270 } login_protocol =
- strcmp(access, "rlogin") == 0 ? rlogin :
- strcmp(access, "tn3270") == 0 ? tn3270 : telnet;
-
- if (hostname) {
- *hostname++ = 0; /* Split */
- } else {
- hostname = host;
- user = 0; /* No user specified */
- }
- if (port) *port++ = 0; /* Split */
-
-
- /* If the person is already telnetting etc, forbid hopping */
- /* This is a security precaution, for us and remote site */
-
- if (HTSecure) {
-
- #ifdef TELNETHOPPER_MAIL
- sprintf(command,
- "finger @%s | mail -s \"**telnethopper %s\" tbl@dxcern.cern.ch",
- HTClientHost, HTClientHost);
- 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",
- access);
- printf("to host %s", hostname);
- if (user) printf(", user name %s", user);
- 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) printf("When you are connected, log in as %s\n", user);
-
- #ifdef NeXT
- #define TELNET_MINUS_L
- #endif
- #ifdef ultrix
- #define TELNET_MINUS_L
- #endif
-
- #ifdef TELNET_MINUS_L
- sprintf(command, "%s%s%s %s %s", access,
- user ? " -l " : "",
- user ? user : "",
- hostname,
- port ? port : "");
- #ifndef RELEASE
- if (TRACE) fprintf(stderr, "HTaccess: Command is: %s\n", command);
- #endif /* RELEASE */
- system(command);
- return HT_NO_DATA; /* Ok - it was done but no data */
- #define TELNET_DONE
- #endif
-
- /* Most unix machines suppport username only with rlogin */
- #ifdef unix
- #ifndef TELNET_DONE
- if (login_protocol != rlogin) {
- sprintf(command, "%s %s %s", access,
- hostname,
- port ? port : "");
- } else {
- sprintf(command, "%s%s%s %s %s", access,
- user ? " -l " : "",
- user ? user : "",
- hostname,
- port ? port : "");
- }
- #ifndef RELEASE
- if (TRACE) fprintf(stderr, "HTaccess: Command is: %s\n", command);
- #endif /* RELEASE */
- system(command);
- return HT_NO_DATA; /* Ok - it was done but no data */
- #define TELNET_DONE
- #endif
- #endif
-
- #ifdef MULTINET /* VMS varieties */
- if (login_protocol == telnet) {
- sprintf(command, "TELNET %s%s %s",
- port ? "/PORT=" : "",
- port ? port : "",
- hostname);
- } else if (login_protocol == tn3270) {
- sprintf(command, "TELNET/TN3270 %s%s %s",
- port ? "/PORT=" : "",
- port ? port : "",
- hostname);
- } else {
- sprintf(command, "RLOGIN%s%s%s%s %s", /*lm 930713 */
- user ? "/USERNAME=" : "",
- user ? user : "",
- port ? "/PORT=" : "",
- port ? port : "",
- hostname);
- }
- #ifndef RELEASE
- if (TRACE) fprintf(stderr, "HTaccess: Command is: %s\n", command);
- #endif /* RELEASE */
- system(command);
- return HT_NO_DATA; /* Ok - it was done but no data */
- #define TELNET_DONE
- #endif
-
- #ifdef UCX
- #define SIMPLE_TELNET
- #endif
- #ifdef VM
- #define SIMPLE_TELNET
- #endif
- #ifdef SIMPLE_TELNET
- if (login_protocol == telnet) { /* telnet only */
- sprintf(command, "TELNET %s", /* @@ Bug: port ignored */
- hostname);
- #ifndef RELEASE
- if (TRACE) fprintf(stderr, "HTaccess: Command is: %s\n", command);
- #endif /* RELEASE */
- system(command);
- return HT_NO_DATA; /* Ok - it was done but no data */
- }
- #endif
-
- #ifndef TELNET_DONE
- fprintf(stderr,
- "Sorry, DosLynx was compiled without the %s access option.\n",
- access);
- fprintf(stderr,
- "\nTo access the information:\n %s to %s", access, hostname);
- if (port) fprintf(stderr," (port %s)\n", port);
- if (user) fprintf(stderr," Log in with username %s", user);
- fprintf(stderr, ".\n");
- return -1;
- #endif
- }
-
- /* "Load a document" -- establishes a session
- ** ------------------------------------------
- **
- ** On entry,
- ** addr must point to the fully qualified hypertext reference.
- **
- ** On exit,
- ** returns <0 Error has occured.
- ** >=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)
- **
- */
- PRIVATE int HTLoadTelnet
- ARGS4
- (
- CONST char *, addr,
- HTParentAnchor *, anchor,
- HTFormat, format_out,
- HTStream *, sink /* Ignored */
- )
- {
- char * access;
-
- char * host;
- int status;
-
- if (sink) {
- HTAlert("Can't output a live session -- it has to be interactive");
- return HT_NO_ACCESS;
- }
- access = HTParse(addr, "file:", PARSE_ACCESS);
-
- host = HTParse(addr, "", PARSE_HOST);
- status = remote_session(access, host);
-
- free(host);
- free(access);
- return status;
- }
-
-
- GLOBALDEF PUBLIC HTProtocol HTTelnet = { "telnet", HTLoadTelnet, NULL };
- GLOBALDEF PUBLIC HTProtocol HTRlogin = { "rlogin", HTLoadTelnet, NULL };
- GLOBALDEF PUBLIC HTProtocol HTTn3270 = { "tn3270", HTLoadTelnet, NULL };
-
-
-