Annotation of libwww/Library/src/HTTelnet.c, revision 2.30
2.14 frystyk 1: /* HTTelnet.c
2: ** TELNET ACCESS, ROLIGIN, etc.
3: **
2.17 frystyk 4: ** (c) COPYRIGHT MIT 1995.
2.14 frystyk 5: ** Please first read the full copyright statement in the file COPYRIGH.
1.1 timbl 6: **
7: ** Authors
2.20 frystyk 8: ** TBL Tim Berners-Lee timbl@w3.org
1.1 timbl 9: ** JFG Jean-Francois Groff jgh@next.com
10: ** DD Denis DeLaRoca (310) 825-4580 <CSP1DWD@mvs.oac.ucla.edu>
2.21 frystyk 11: ** HFN Henrik Frystyk
1.1 timbl 12: ** History
13: ** 8 Jun 92 Telnet hopping prohibited as telnet is not secure (TBL)
14: ** 26 Jun 92 When over DECnet, suppressed FTP, Gopher and News. (JFG)
15: ** 6 Oct 92 Moved HTClientHost and logfile into here. (TBL)
16: ** 17 Dec 92 Tn3270 added, bug fix. (DD)
17: ** 2 Feb 93 Split from HTAccess.c. Registration.(TBL)
2.11 luotonen 18: ** 2 May 94 Fixed security hole with illegal characters in host
19: ** and user names (code from Mosaic/Eric Bina).
1.1 timbl 20: */
21:
2.16 frystyk 22: /* Library include files */
23: #include "tcp.h"
24: #include "HTUtils.h"
2.27 frystyk 25: #include "HTString.h"
1.1 timbl 26: #include "HTParse.h"
2.30 ! frystyk 27: #include "HTAccess.h"
1.1 timbl 28: #include "HTAnchor.h"
2.21 frystyk 29: #include "HTChunk.h"
2.27 frystyk 30: #include "HTReqMan.h"
1.3 timbl 31: #include "HTAlert.h"
2.12 frystyk 32: #include "HTTelnet.h" /* Implemented here */
1.1 timbl 33:
2.12 frystyk 34: /* ------------------------------------------------------------------------- */
1.1 timbl 35:
2.11 luotonen 36: /* make a string secure for passage to the
37: ** system() command. Make it contain only alphanumneric
38: ** characters, or the characters '.', '-', '_', '+'.
39: ** Also remove leading '-' or '+'.
40: ** -----------------------------------------------------
41: ** Function taken from Mosaic's HTTelnet.c.
42: */
2.28 frystyk 43: PRIVATE void make_system_secure (char * str)
2.11 luotonen 44: {
2.21 frystyk 45: char *ptr1, *ptr2;
46: if ((str == NULL)||(*str == '\0'))
47: return;
2.11 luotonen 48:
2.21 frystyk 49: /*
50: * remove leading '-' or '+' by making it into whitespace that
51: * will be stripped later.
52: */
53: if (*str=='-' || *str=='+')
54: *str = ' ';
55: ptr1 = ptr2 = str;
56: while (*ptr1) {
57: if ((!isalpha((int)*ptr1))&&(!isdigit((int)*ptr1))&&
58: (*ptr1 != '.')&&(*ptr1 != '_')&&
59: (*ptr1 != '+')&&(*ptr1 != '-')) {
60: ptr1++;
61: } else {
62: *ptr2 = *ptr1;
63: ptr2++;
64: ptr1++;
2.11 luotonen 65: }
2.21 frystyk 66: }
67: *ptr2 = *ptr1;
2.11 luotonen 68: }
69:
1.1 timbl 70: /* Telnet or "rlogin" access
71: ** -------------------------
2.27 frystyk 72: ** Returns HT_NO_DATA OK
73: ** HT_ERROR Error
1.1 timbl 74: */
2.28 frystyk 75: PRIVATE int remote_session (HTRequest * request, char * url)
1.1 timbl 76: {
2.21 frystyk 77: int status = HT_NO_DATA;
78: HTChunk *cmd = HTChunkCreate(64);
79: char *access = HTParse(url, "", PARSE_ACCESS);
80: char *host = HTParse(url, "", PARSE_HOST);
81: char *hostname = strchr(host, '@');
82: char *user = NULL;
83: char *passwd = NULL;
84: char *port = NULL;
85:
2.27 frystyk 86: /* We must be in interactive mode */
87: if (!HTPrompt_interactive()) {
88: HTAlert(request,"Can't output live session - must be interactive");
89: free(access);
90: free(host);
91: HTChunkFree(cmd);
92: return HT_ERROR;
93: }
94:
2.21 frystyk 95: /* Look for user name, password, and port number */
96: if (hostname) {
97: *hostname++ = '\0';
98: user = host;
99: if ((passwd = strchr(host, ':')) != NULL) {
100: *passwd++ = '\0';
101: HTUnEscape(passwd);
102: }
103: HTUnEscape(user); /* Might have a funny userid */
104: } else {
105: hostname = host;
106: }
107: if ((port = strchr(hostname, ':')) != NULL)
108: *port++ = '\0';
109:
110: /* If the person is already telnetting etc, forbid hopping */
2.30 ! frystyk 111: if (HTLib_secure()) {
2.21 frystyk 112: HTChunk *msg = HTChunkCreate(256);
113: HTChunkPuts(msg, "Sorry, but the service you have selected is one ");
114: HTChunkPuts(msg, "to which you have to log in. If you were running ");
115: HTChunkPuts(msg, "locally on your own computer, you would be ");
116: HTChunkPuts(msg, "connected automatically. For security reasons, ");
117: HTChunkPuts(msg, "this is not allowed when you log in to this ");
118: HTChunkPuts(msg, "information service remotely. ");
1.1 timbl 119: if (hostname) {
2.21 frystyk 120: HTChunkPuts(msg,"You can manually connect to this service using ");
121: HTChunkPuts(msg, access);
122: HTChunkPuts(msg, " to host ");
123: HTChunkPuts(msg, hostname);
124: if (port) {
125: HTChunkPuts(msg, " using port ");
126: HTChunkPuts(msg, port);
127: }
128: if (user) {
129: HTChunkPuts(msg, " and user name ");
130: HTChunkPuts(msg, user);
131: }
132: if (passwd) {
133: HTChunkPuts(msg, " and passwd ");
134: HTChunkPuts(msg, passwd);
135: }
136: }
2.25 frystyk 137: HTAlert(request, msg->data);
2.21 frystyk 138: HTChunkFree(msg);
139: free(access);
140: free(host);
2.27 frystyk 141: HTChunkFree(cmd);
2.21 frystyk 142: return HT_NO_DATA;
143: }
144:
145: /*
146: ** Make user and hostname secure by removing leading '-' or '+'.
147: ** and allowing only alphanumeric, '.', '_', '+', and '-'.
148: */
149: make_system_secure(user);
150: make_system_secure(passwd);
151: make_system_secure(hostname);
152: make_system_secure(port);
153:
2.27 frystyk 154: if (!strcasecomp(access, "telnet")) {
2.21 frystyk 155: #ifdef SIMPLE_TELNET
156: HTChunkPuts(cmd, "TELNET ");
157: HTChunkPuts(cmd, hostname); /* Port is ignored */
158: #else
2.26 frystyk 159: #ifdef FULL_TELNET /* User and port */
160: HTChunkPuts(cmd, "telnet ");
161: HTChunkPuts(cmd, hostname);
162: if (user) {
163: HTChunkPuts(cmd, " -l ");
164: HTChunkPuts(cmd, user);
165: }
166: if (port) {
167: HTChunkPutc(cmd, ' ');
168: HTChunkPuts(cmd, port);
169: }
170: #else
2.21 frystyk 171: #ifdef MULTINET
172: HTChunkPuts(cmd, "TELNET ");
173: if (port) {
174: HTChunkPuts(cmd, "/PORT=");
175: HTChunkPuts(cmd, port);
176: HTChunkPutc(cmd, ' ');
177: }
178: HTChunkPuts(cmd, hostname);
2.26 frystyk 179: #else /* User is ignored */
2.21 frystyk 180: HTChunkPuts(cmd, "telnet ");
181: HTChunkPuts(cmd, hostname);
182: if (port) {
183: HTChunkPutc(cmd, ' ');
184: HTChunkPuts(cmd, port);
185: }
186: #endif /* MULTINET */
2.26 frystyk 187: #endif /* FULL_TELNET */
2.21 frystyk 188: #endif /* SIMPLE_TELNET */
189:
2.27 frystyk 190: } else if (!strcasecomp(access, "rlogin")) {
2.21 frystyk 191: #ifdef MULTINET
192: HTChunkPuts(cmd, "RLOGIN ");
193: if (user) {
194: HTChunkPuts(cmd, "/USERNAME=");
195: HTChunkPuts(cmd, user);
196: HTChunkPutc(cmd, ' ');
197: }
198: if (port) {
199: HTChunkPuts(cmd, "/PORT=");
200: HTChunkPuts(cmd, port);
201: HTChunkPutc(cmd, ' ');
202: }
203: HTChunkPuts(cmd, hostname);
204: #else
205: #ifdef RLOGIN_USER /* format: "hostname -l user" */
206: HTChunkPuts(cmd, "rlogin ");
207: HTChunkPuts(cmd, hostname);
208: if (user) {
2.22 frystyk 209: HTChunkPuts(cmd, " -l ");
2.21 frystyk 210: HTChunkPuts(cmd, user);
211: }
212: #else /* format: "-l user hostname" */
213: HTChunkPuts(cmd, "rlogin ");
214: if (user) {
215: HTChunkPuts(cmd, "-l ");
216: HTChunkPuts(cmd, user);
217: HTChunkPutc(cmd, ' ');
218: }
219: HTChunkPuts(cmd, hostname);
220: #endif /* RLOGIN_AFTER */
221: #endif /* MULTINET */
222:
2.27 frystyk 223: } else if (!strcasecomp(access, "tn3270")) {
2.21 frystyk 224: #ifdef MULTINET
225: HTChunkPuts(cmd, "TELNET/TN3270 ");
226: if (port) {
227: HTChunkPuts(cmd, "/PORT=");
228: HTChunkPuts(cmd, port);
229: HTChunkPutc(cmd, ' ');
1.1 timbl 230: }
2.21 frystyk 231: HTChunkPuts(cmd, hostname);
232: #else
233: HTChunkPuts(cmd, "tn3270 ");
234: HTChunkPuts(cmd, hostname); /* Port is ignored */
235: #endif /* MULTINET */
236:
237: } else {
238: if (PROT_TRACE)
2.29 frystyk 239: TTYPrint(TDEST, "Telnet...... Unknown access method: `%s\'\n",
2.21 frystyk 240: access);
241: status = HT_ERROR;
242: }
1.1 timbl 243:
2.21 frystyk 244: /* Now we are ready to execute the command */
245: if (PROT_TRACE)
2.29 frystyk 246: TTYPrint(TDEST, "Telnet...... Command is `%s\'\n", cmd->data);
2.21 frystyk 247: if (user) {
248: HTChunk *msg = HTChunkCreate(128);
249: HTChunkPuts(msg, "When you are connected, log in");
2.27 frystyk 250: if (strcasecomp(access, "rlogin")) {
2.21 frystyk 251: HTChunkPuts(msg, "as <");
252: HTChunkPuts(msg, user);
253: HTChunkPutc(msg, '>');
254: }
255: if (passwd) {
256: HTChunkPuts(msg, " using password <");
257: HTChunkPuts(msg, passwd);
258: HTChunkPutc(msg, '>');
1.1 timbl 259: }
2.25 frystyk 260: HTAlert(request, msg->data);
2.21 frystyk 261: HTChunkFree(msg);
262: }
2.29 frystyk 263: #ifdef GOT_SYSTEM
2.21 frystyk 264: system(cmd->data);
2.29 frystyk 265: #endif
2.21 frystyk 266: free(access);
267: free(host);
268: HTChunkFree(cmd);
269: return status;
1.1 timbl 270:
271: }
272:
273: /* "Load a document" -- establishes a session
2.21 frystyk 274: ** ==========================================
1.1 timbl 275: **
276: ** On entry,
2.21 frystyk 277: ** request This is the request structure
1.1 timbl 278: ** On exit,
2.21 frystyk 279: ** returns HT_ERROR Error has occured or interrupted
280: ** HT_NO_DATA if return status 204 No Response
1.1 timbl 281: */
2.28 frystyk 282: PUBLIC int HTLoadTelnet (SOCKET soc, HTRequest * request, SockOps ops)
1.1 timbl 283: {
2.27 frystyk 284: char *url = HTAnchor_physical(request->anchor);
2.10 luotonen 285:
2.27 frystyk 286: /* This is a trick as we don't have any socket! */
287: if (ops == FD_NONE) {
2.29 frystyk 288: if (PROT_TRACE) TTYPrint(TDEST, "Telnet...... Looking for `%s\'\n",url);
2.27 frystyk 289: HTCleanTelnetString(url);
290: {
291: int status = remote_session(request, url);
292: HTNet_delete(request->net, status);
293: }
294: } else if (ops == FD_CLOSE) /* Interrupted */
295: HTNet_delete(request->net, HT_INTERRUPTED);
296: else
297: HTNet_delete(request->net, HT_ERROR);
298: return HT_OK;
1.1 timbl 299: }
300:
301:
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