Annotation of libwww/Library/src/HTTelnet.c, revision 2.22
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"
1.1 timbl 25: #include "HTParse.h"
26: #include "HTAnchor.h"
2.21 frystyk 27: #include "HTChunk.h"
1.1 timbl 28: #include "HTAccess.h"
1.3 timbl 29: #include "HTAlert.h"
2.12 frystyk 30: #include "HTTelnet.h" /* Implemented here */
1.1 timbl 31:
2.12 frystyk 32: /* ------------------------------------------------------------------------- */
1.1 timbl 33:
2.11 luotonen 34: /* make a string secure for passage to the
35: ** system() command. Make it contain only alphanumneric
36: ** characters, or the characters '.', '-', '_', '+'.
37: ** Also remove leading '-' or '+'.
38: ** -----------------------------------------------------
39: ** Function taken from Mosaic's HTTelnet.c.
40: */
41: PRIVATE void make_system_secure ARGS1(char *, str)
42: {
2.21 frystyk 43: char *ptr1, *ptr2;
44: if ((str == NULL)||(*str == '\0'))
45: return;
2.11 luotonen 46:
2.21 frystyk 47: /*
48: * remove leading '-' or '+' by making it into whitespace that
49: * will be stripped later.
50: */
51: if (*str=='-' || *str=='+')
52: *str = ' ';
53: ptr1 = ptr2 = str;
54: while (*ptr1) {
55: if ((!isalpha((int)*ptr1))&&(!isdigit((int)*ptr1))&&
56: (*ptr1 != '.')&&(*ptr1 != '_')&&
57: (*ptr1 != '+')&&(*ptr1 != '-')) {
58: ptr1++;
59: } else {
60: *ptr2 = *ptr1;
61: ptr2++;
62: ptr1++;
2.11 luotonen 63: }
2.21 frystyk 64: }
65: *ptr2 = *ptr1;
2.11 luotonen 66: }
67:
1.1 timbl 68: /* Telnet or "rlogin" access
69: ** -------------------------
70: */
2.21 frystyk 71: PRIVATE int remote_session ARGS1(char *, url)
1.1 timbl 72: {
2.21 frystyk 73: int status = HT_NO_DATA;
74: HTChunk *cmd = HTChunkCreate(64);
75: char *access = HTParse(url, "", PARSE_ACCESS);
76: char *host = HTParse(url, "", PARSE_HOST);
77: char *hostname = strchr(host, '@');
78: char *user = NULL;
79: char *passwd = NULL;
80: char *port = NULL;
81:
82: /* Look for user name, password, and port number */
83: if (hostname) {
84: *hostname++ = '\0';
85: user = host;
86: if ((passwd = strchr(host, ':')) != NULL) {
87: *passwd++ = '\0';
88: HTUnEscape(passwd);
89: }
90: HTUnEscape(user); /* Might have a funny userid */
91: } else {
92: hostname = host;
93: }
94: if ((port = strchr(hostname, ':')) != NULL)
95: *port++ = '\0';
96:
97: /* If the person is already telnetting etc, forbid hopping */
98: if (HTClientHost) {
99: HTChunk *msg = HTChunkCreate(256);
100: HTChunkPuts(msg, "Sorry, but the service you have selected is one ");
101: HTChunkPuts(msg, "to which you have to log in. If you were running ");
102: HTChunkPuts(msg, "locally on your own computer, you would be ");
103: HTChunkPuts(msg, "connected automatically. For security reasons, ");
104: HTChunkPuts(msg, "this is not allowed when you log in to this ");
105: HTChunkPuts(msg, "information service remotely. ");
1.1 timbl 106: if (hostname) {
2.21 frystyk 107: HTChunkPuts(msg,"You can manually connect to this service using ");
108: HTChunkPuts(msg, access);
109: HTChunkPuts(msg, " to host ");
110: HTChunkPuts(msg, hostname);
111: if (port) {
112: HTChunkPuts(msg, " using port ");
113: HTChunkPuts(msg, port);
114: }
115: if (user) {
116: HTChunkPuts(msg, " and user name ");
117: HTChunkPuts(msg, user);
118: }
119: if (passwd) {
120: HTChunkPuts(msg, " and passwd ");
121: HTChunkPuts(msg, passwd);
122: }
123: }
124: HTAlert(msg->data);
125: HTChunkFree(msg);
126: free(access);
127: free(host);
128: return HT_NO_DATA;
129: }
130:
131: /*
132: ** Make user and hostname secure by removing leading '-' or '+'.
133: ** and allowing only alphanumeric, '.', '_', '+', and '-'.
134: */
135: make_system_secure(user);
136: make_system_secure(passwd);
137: make_system_secure(hostname);
138: make_system_secure(port);
139:
140: if (!strcmp(access, "telnet")) {
141: #ifdef SIMPLE_TELNET
142: HTChunkPuts(cmd, "TELNET ");
143: HTChunkPuts(cmd, hostname); /* Port is ignored */
144: #else
145: #ifdef MULTINET
146: HTChunkPuts(cmd, "TELNET ");
147: if (port) {
148: HTChunkPuts(cmd, "/PORT=");
149: HTChunkPuts(cmd, port);
150: HTChunkPutc(cmd, ' ');
151: }
152: HTChunkPuts(cmd, hostname);
153: #else
154: HTChunkPuts(cmd, "telnet ");
155: HTChunkPuts(cmd, hostname);
156: if (port) {
157: HTChunkPutc(cmd, ' ');
158: HTChunkPuts(cmd, port);
159: }
160: #endif /* MULTINET */
161: #endif /* SIMPLE_TELNET */
162:
163: } else if (!strcmp(access, "rlogin")) {
164: #ifdef MULTINET
165: HTChunkPuts(cmd, "RLOGIN ");
166: if (user) {
167: HTChunkPuts(cmd, "/USERNAME=");
168: HTChunkPuts(cmd, user);
169: HTChunkPutc(cmd, ' ');
170: }
171: if (port) {
172: HTChunkPuts(cmd, "/PORT=");
173: HTChunkPuts(cmd, port);
174: HTChunkPutc(cmd, ' ');
175: }
176: HTChunkPuts(cmd, hostname);
177: #else
178: #ifdef RLOGIN_USER /* format: "hostname -l user" */
179: HTChunkPuts(cmd, "rlogin ");
180: HTChunkPuts(cmd, hostname);
181: if (user) {
2.22 ! frystyk 182: HTChunkPuts(cmd, " -l ");
2.21 frystyk 183: HTChunkPuts(cmd, user);
184: }
185: #else /* format: "-l user hostname" */
186: HTChunkPuts(cmd, "rlogin ");
187: if (user) {
188: HTChunkPuts(cmd, "-l ");
189: HTChunkPuts(cmd, user);
190: HTChunkPutc(cmd, ' ');
191: }
192: HTChunkPuts(cmd, hostname);
193: #endif /* RLOGIN_AFTER */
194: #endif /* MULTINET */
195:
196: } else if (!strcmp(access, "tn3270")) {
197: #ifdef MULTINET
198: HTChunkPuts(cmd, "TELNET/TN3270 ");
199: if (port) {
200: HTChunkPuts(cmd, "/PORT=");
201: HTChunkPuts(cmd, port);
202: HTChunkPutc(cmd, ' ');
1.1 timbl 203: }
2.21 frystyk 204: HTChunkPuts(cmd, hostname);
205: #else
206: HTChunkPuts(cmd, "tn3270 ");
207: HTChunkPuts(cmd, hostname); /* Port is ignored */
208: #endif /* MULTINET */
209:
210: } else {
211: if (PROT_TRACE)
212: fprintf(TDEST, "Telnet...... Unknown access method: `%s\'\n",
213: access);
214: status = HT_ERROR;
215: }
1.1 timbl 216:
2.21 frystyk 217: /* Now we are ready to execute the command */
218: if (PROT_TRACE)
219: fprintf(TDEST, "Telnet...... Command is `%s\'\n", cmd->data);
220: if (user) {
221: HTChunk *msg = HTChunkCreate(128);
222: HTChunkPuts(msg, "When you are connected, log in");
223: if (strcmp(access, "rlogin")) {
224: HTChunkPuts(msg, "as <");
225: HTChunkPuts(msg, user);
226: HTChunkPutc(msg, '>');
227: }
228: if (passwd) {
229: HTChunkPuts(msg, " using password <");
230: HTChunkPuts(msg, passwd);
231: HTChunkPutc(msg, '>');
1.1 timbl 232: }
2.21 frystyk 233: HTAlert(msg->data);
234: HTChunkFree(msg);
235: }
236: system(cmd->data);
237: free(access);
238: free(host);
239: HTChunkFree(cmd);
240: return status;
1.1 timbl 241:
242: }
243:
244: /* "Load a document" -- establishes a session
2.21 frystyk 245: ** ==========================================
1.1 timbl 246: **
247: ** On entry,
2.21 frystyk 248: ** request This is the request structure
1.1 timbl 249: ** On exit,
2.21 frystyk 250: ** returns HT_ERROR Error has occured or interrupted
251: ** HT_NO_DATA if return status 204 No Response
1.1 timbl 252: */
2.9 timbl 253: PRIVATE int HTLoadTelnet ARGS1(HTRequest *, request)
1.1 timbl 254: {
2.21 frystyk 255: char *url;
256: if (!request || !request->anchor) {
257: if (PROT_TRACE) fprintf(TDEST, "HTLoadTelnet Bad argument\n");
258: return HT_ERROR;
259: }
2.10 luotonen 260:
2.21 frystyk 261: /* We must be in interactive mode */
262: if (!HTInteractive) {
1.2 timbl 263: HTAlert("Can't output a live session -- it has to be interactive");
2.21 frystyk 264: return HT_ERROR;
2.10 luotonen 265: }
2.21 frystyk 266: url = HTAnchor_physical(request->anchor);
267: HTCleanTelnetString(url);
268: return remote_session(url);
1.1 timbl 269: }
270:
271:
2.13 frystyk 272: GLOBALDEF PUBLIC HTProtocol HTTelnet = {
273: "telnet", SOC_BLOCK, HTLoadTelnet, NULL, NULL
274: };
275:
276: GLOBALDEF PUBLIC HTProtocol HTRlogin = {
277: "rlogin", SOC_BLOCK, HTLoadTelnet, NULL, NULL
278: };
279:
280: GLOBALDEF PUBLIC HTProtocol HTTn3270 = {
281: "tn3270", SOC_BLOCK, HTLoadTelnet, NULL, NULL
282: };
1.1 timbl 283:
284:
Webmaster
![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to HTTelnet.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Public] / libwww / Library / src