Annotation of libwww/Library/src/HTTelnet.c, revision 1.1
1.1 ! timbl 1: /* Telnet Acees, Roligin, etc HTAccess.c
! 2: ** ==========================
! 3: **
! 4: ** Authors
! 5: ** TBL Tim Berners-Lee timbl@info.cern.ch
! 6: ** JFG Jean-Francois Groff jgh@next.com
! 7: ** DD Denis DeLaRoca (310) 825-4580 <CSP1DWD@mvs.oac.ucla.edu>
! 8: ** History
! 9: ** 8 Jun 92 Telnet hopping prohibited as telnet is not secure (TBL)
! 10: ** 26 Jun 92 When over DECnet, suppressed FTP, Gopher and News. (JFG)
! 11: ** 6 Oct 92 Moved HTClientHost and logfile into here. (TBL)
! 12: ** 17 Dec 92 Tn3270 added, bug fix. (DD)
! 13: ** 2 Feb 93 Split from HTAccess.c. Registration.(TBL)
! 14: */
! 15:
! 16: /* Implements:
! 17: */
! 18: #include HTTelnet.h
! 19:
! 20: #include "HTParse.h"
! 21: #include "HTUtils.h"
! 22: #include "WWW.h"
! 23: #include "HTAnchor.h"
! 24: #include "HTTP.h"
! 25: #include "HTFile.h"
! 26: #include <errno.h>
! 27: #include <stdio.h>
! 28:
! 29: #include "tcp.h"
! 30: #include "HText.h"
! 31:
! 32: #include "HTAccess.h"
! 33:
! 34: #define HT_NO_DATA -9999
! 35:
! 36:
! 37: /* Telnet or "rlogin" access
! 38: ** -------------------------
! 39: */
! 40: PRIVATE int remote_session ARGS2(char *, access, char *, host)
! 41: {
! 42: char * user = host;
! 43: char * hostname = strchr(host, '@');
! 44: char * port = strchr(host, ':');
! 45: char command[256];
! 46: enum _login_protocol { telnet, rlogin, tn3270 } login_protocol =
! 47: strcmp(access, "rlogin") == 0 ? rlogin :
! 48: strcmp(access, "tn3270") == 0 ? tn3270 : telnet;
! 49:
! 50: if (hostname) {
! 51: *hostname++ = 0; /* Split */
! 52: } else {
! 53: hostname = host;
! 54: user = 0; /* No user specified */
! 55: }
! 56: if (port) *port++ = 0; /* Split */
! 57:
! 58:
! 59: /* If the person is already telnetting etc, forbid hopping */
! 60: /* This is a security precaution, for us and remote site */
! 61:
! 62: if (HTClientHost) {
! 63:
! 64: #ifdef TELNETHOPPER_MAIL
! 65: sprintf(command,
! 66: "finger @%s | mail -s \"**telnethopper %s\" tbl@dxcern.cern.ch",
! 67: HTClientHost, HTClientHost);
! 68: system(command);
! 69: #endif
! 70: printf("\n\nSorry, but the service you have selected is one\n");
! 71: printf("to which you have to log in. If you were running www\n");
! 72: printf("on your own computer, you would be automatically connected.\n");
! 73: printf("For security reasons, this is not allowed when\n");
! 74: printf("you log in to this information service remotely.\n\n");
! 75:
! 76: printf("You can manually connect to this service using %s\n",
! 77: access);
! 78: printf("to host %s", hostname);
! 79: if (user) printf(", user name %s", user);
! 80: if (port) printf(", port %s", port);
! 81: printf(".\n\n");
! 82: return HT_NO_DATA;
! 83: }
! 84:
! 85: /* Not all telnet servers get it even if user name is specified
! 86: ** so we always tell the guy what to log in as
! 87: */
! 88: if (user) printf("When you are connected, log in as %s\n", user);
! 89:
! 90: #ifdef NeXT
! 91: #define TELNET_MINUS_L
! 92: #endif
! 93: #ifdef ultrix
! 94: #define TELNET_MINUS_L
! 95: #endif
! 96:
! 97: #ifdef TELNET_MINUS_L
! 98: #endif
! 99: sprintf(command, "%s%s%s %s %s", access,
! 100: user ? " -l " : "",
! 101: user ? user : "",
! 102: hostname,
! 103: port ? port : "");
! 104:
! 105: if (TRACE) fprintf(stderr, "HTaccess: Command is: %s\n", command);
! 106: system(command);
! 107: return HT_NO_DATA; /* Ok - it was done but no data */
! 108: #define TELNET_DONE
! 109:
! 110: /* Most unix machines suppport username only with rlogin */
! 111: #ifdef unix
! 112: #ifndef TELNET_DONE
! 113: if (login_protocol != rlogin) {
! 114: sprintf(command, "%s %s %s", access,
! 115: hostname,
! 116: port ? port : "");
! 117: } else {
! 118: sprintf(command, "%s%s%s %s %s", access,
! 119: user ? " -l " : "",
! 120: user ? user : "",
! 121: hostname,
! 122: port ? port : "");
! 123: }
! 124: if (TRACE) fprintf(stderr, "HTaccess: Command is: %s\n", command);
! 125: system(command);
! 126: return HT_NO_DATA; /* Ok - it was done but no data */
! 127: #define TELNET_DONE
! 128: #endif
! 129: #endif
! 130:
! 131: #ifdef MULTINET /* VMS varieties */
! 132: if (login_protocol == telnet) {
! 133: sprintf(command, "TELNET %s%s %s",
! 134: port ? "/PORT=" : "",
! 135: port ? port : "",
! 136: hostname);
! 137: } else if (login_protocol == tn3270) {
! 138: sprintf(command, "TN3270 %s%s %s",
! 139: port ? "/PORT=" : "",
! 140: port ? port : "",
! 141: hostname);
! 142: } else {
! 143: sprintf(command, "RLOGIN%s%s%s%s %s", access,
! 144: user ? "/USERNAME=" : "",
! 145: user ? user : "",
! 146: port ? "/PORT=" : "",
! 147: port ? port : "",
! 148: hostname);
! 149: }
! 150: if (TRACE) fprintf(stderr, "HTaccess: Command is: %s\n", command);
! 151: system(command);
! 152: return HT_NO_DATA; /* Ok - it was done but no data */
! 153: #define TELNET_DONE
! 154: #endif
! 155:
! 156: #ifdef UCX
! 157: #define SIMPLE_TELNET
! 158: #endif
! 159: #ifdef VM
! 160: #define SIMPLE_TELNET
! 161: #endif
! 162: #ifdef SIMPLE_TELNET
! 163: if (login_protocol == telnet) { /* telnet only */
! 164: sprintf(command, "TELNET %s", /* @@ Bug: port ignored */
! 165: hostname);
! 166: if (TRACE) fprintf(stderr, "HTaccess: Command is: %s\n", command);
! 167: system(command);
! 168: return HT_NO_DATA; /* Ok - it was done but no data */
! 169: }
! 170: #endif
! 171:
! 172: #ifndef TELNET_DONE
! 173: fprintf(stderr,
! 174: "Sorry, this browser was compiled without the %s access option.\n",
! 175: access);
! 176: fprintf(stderr,
! 177: "\nTo access the information you must %s to %s", access, hostname);
! 178: if (port) fprintf(stderr," (port %s)", port);
! 179: if (user) fprintf(stderr," logging in with username %s", user);
! 180: fprintf(stderr, ".\n");
! 181: return -1;
! 182: #endif
! 183: }
! 184:
! 185: /* "Load a document" -- establishes a session
! 186: ** ------------------------------------------
! 187: **
! 188: ** On entry,
! 189: ** addr must point to the fully qualified hypertext reference.
! 190: **
! 191: ** On exit,
! 192: ** returns <0 Error has occured.
! 193: ** >=0 Value of file descriptor or socket to be used
! 194: ** to read data.
! 195: ** *pFormat Set to the format of the file, if known.
! 196: ** (See WWW.h)
! 197: **
! 198: */
! 199: PRIVATE int HTLoadTelnet
! 200: ARGS3
! 201: (
! 202: CONST char *, addr,
! 203: HTParentAnchor *, anchor,
! 204: int, diagnostic
! 205: )
! 206: {
! 207: char * access = HTParse(addr, "file:", PARSE_ACCESS);
! 208:
! 209: char * host = HTParse(addr, "", PARSE_HOST);
! 210: int status = remote_session(access, host);
! 211:
! 212: free(host);
! 213: free(access);
! 214: return status;
! 215: }
! 216:
! 217:
! 218: PUBLIC HTAccessMethod HTTelnet = { "telnet", HTLoadTelnet, NULL };
! 219: PUBLIC HTAccessMethod HTRlogin = { "rlogin", HTLoadTelnet, NULL };
! 220: PUBLIC HTAccessMethod HTTn3270 = { "tn3270", HTLoadTelnet, NULL };
! 221:
! 222:
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