File: telnet-test.c

package info (click to toggle)
libtelnet 0.21-4
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 1,764 kB
  • ctags: 732
  • sloc: sh: 11,036; ansic: 2,390; makefile: 85
file content (298 lines) | stat: -rw-r--r-- 7,395 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
/*
 * Sean Middleditch
 * sean@sourcemud.org
 *
 * The author or authors of this code dedicate any and all copyright interest
 * in this code to the public domain. We make this dedication for the benefit
 * of the public at large and to the detriment of our heirs and successors. We
 * intend this dedication to be an overt act of relinquishment in perpetuity of
 * all present and future rights to this code under copyright law. 
 */

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>

#include "libtelnet.h"

static const telnet_telopt_t telopts[] = {
 { TELNET_TELOPT_COMPRESS2,	TELNET_WILL, TELNET_DONT },
 { TELNET_TELOPT_ZMP,		TELNET_WILL, TELNET_DONT },
 { TELNET_TELOPT_MSSP,		TELNET_WILL, TELNET_DONT },
 { TELNET_TELOPT_NEW_ENVIRON, TELNET_WILL, TELNET_DONT },
 { TELNET_TELOPT_TTYPE,		TELNET_WILL, TELNET_DONT },
 { -1, 0, 0 }
};

static const char *get_cmd(unsigned char cmd) {
	static char buffer[4];

	switch (cmd) {
	case 255: return "IAC";
	case 254: return "DONT";
	case 253: return "DO";
	case 252: return "WONT";
	case 251: return "WILL";
	case 250: return "SB";
	case 249: return "GA";
	case 248: return "EL";
	case 247: return "EC";
	case 246: return "AYT";
	case 245: return "AO";
	case 244: return "IP";
	case 243: return "BREAK";
	case 242: return "DM";
	case 241: return "NOP";
	case 240: return "SE";
	case 239: return "EOR";
	case 238: return "ABORT";
	case 237: return "SUSP";
	case 236: return "xEOF";
	default:
		snprintf(buffer, sizeof(buffer), "%d", (int)cmd);
		return buffer;
	}
}

static const char *get_opt(unsigned char opt) {
	switch (opt) {
	case 0: return "BINARY";
	case 1: return "ECHO";
	case 2: return "RCP";
	case 3: return "SGA";
	case 4: return "NAMS";
	case 5: return "STATUS";
	case 6: return "TM";
	case 7: return "RCTE";
	case 8: return "NAOL";
	case 9: return "NAOP";
	case 10: return "NAOCRD";
	case 11: return "NAOHTS";
	case 12: return "NAOHTD";
	case 13: return "NAOFFD";
	case 14: return "NAOVTS";
	case 15: return "NAOVTD";
	case 16: return "NAOLFD";
	case 17: return "XASCII";
	case 18: return "LOGOUT";
	case 19: return "BM";
	case 20: return "DET";
	case 21: return "SUPDUP";
	case 22: return "SUPDUPOUTPUT";
	case 23: return "SNDLOC";
	case 24: return "TTYPE";
	case 25: return "EOR";
	case 26: return "TUID";
	case 27: return "OUTMRK";
	case 28: return "TTYLOC";
	case 29: return "3270REGIME";
	case 30: return "X3PAD";
	case 31: return "NAWS";
	case 32: return "TSPEED";
	case 33: return "LFLOW";
	case 34: return "LINEMODE";
	case 35: return "XDISPLOC";
	case 36: return "ENVIRON";
	case 37: return "AUTHENTICATION";
	case 38: return "ENCRYPT";
	case 39: return "NEW-ENVIRON";
	case 70: return "MSSP";
	case 85: return "COMPRESS";
	case 86: return "COMPRESS2";
	case 93: return "ZMP";
	case 255: return "EXOPL";
	default: return "unknown";
	}
}

static void decode(char *buffer, size_t *size) {
	const char *in = buffer, *end = buffer + *size;
	char *out = buffer;
	int c;

	while (in != end) {
		if (*in == '%') {
			++in;
			if (in == end) {
				break;
			}
			if (*in == '%') {
				*out = '%';
			} else {
				if (isdigit(*in)) {
					c = *in - '0';
				} else {
					c = *in - 'A' + 10;
				}
				++in;
				if (in == end) {
					break;
				}
				c *= 16;
				if (isdigit(*in)) {
					c += *in - '0';
				} else {
					c += *in - 'A' + 10;
				}
				*out = c;
			}
			++out;
		} else if (isprint(*in)) {
			*out = *in;
			++out;
		}

		++in;
	}

	*out = '\0';
	*size = out - buffer;
}

static void print_encode(const char *buffer, size_t size) {
	const char *in = buffer, *end = buffer + size;

	while (in != end) {
		if (*in == '%') {
			printf("%%%%");
		} else if (isprint(*in)) {
			printf("%c", *in);
		} else {
			printf("%%%02X", *in);
		}
		++in;
	}
}

static void event_print(telnet_t *telnet, telnet_event_t *ev, void *ud) {
	size_t i;

	switch (ev->type) {
	case TELNET_EV_DATA:
		printf("DATA [%zi] ==> ", ev->data.size);
		print_encode(ev->data.buffer, ev->data.size);
		printf("\n");
		break;
	case TELNET_EV_SEND:
		break;
	case TELNET_EV_IAC:
		printf("IAC %d (%s)\n", (int)ev->iac.cmd, get_cmd(ev->iac.cmd));
		break;
	case TELNET_EV_WILL:
		printf("WILL %d (%s)\n", (int)ev->neg.telopt, get_opt(ev->neg.telopt));
		break;
	case TELNET_EV_WONT:
		printf("WONT %d (%s)\n", (int)ev->neg.telopt, get_opt(ev->neg.telopt));
		break;
	case TELNET_EV_DO:
		printf("DO %d (%s)\n", (int)ev->neg.telopt, get_opt(ev->neg.telopt));
		break;
	case TELNET_EV_DONT:
		printf("DONT %d (%s)\n", (int)ev->neg.telopt, get_opt(ev->neg.telopt));
		break;
	case TELNET_EV_SUBNEGOTIATION:
		switch (ev->sub.telopt) {
		case TELNET_TELOPT_ENVIRON:
		case TELNET_TELOPT_NEW_ENVIRON:
		case TELNET_TELOPT_TTYPE:
		case TELNET_TELOPT_ZMP:
		case TELNET_TELOPT_MSSP:
			/* print nothing */
			break;
		default:
			printf("SUB %d (%s) [%zi]\n", (int)ev->sub.telopt, get_opt(ev->sub.telopt), ev->sub.size);
			break;
		}
		break;
	case TELNET_EV_ZMP:
		printf("ZMP (%s) [%zi]\n", ev->zmp.argv[0], ev->zmp.argc);
		break;
	case TELNET_EV_TTYPE:
		printf("TTYPE %s %s\n", ev->ttype.cmd ? "SEND" : "IS",
				ev->ttype.name ? ev->ttype.name : "");
		break;
	/* ENVIRON/NEW-ENVIRON commands */
	case TELNET_EV_ENVIRON:
		printf("ENVIRON [%zi parts] ==> %s", ev->environ.size, ev->environ.cmd == TELNET_ENVIRON_IS ? "IS" : (ev->environ.cmd == TELNET_ENVIRON_SEND ? "SEND" : "INFO"));
		for (i = 0; i != ev->environ.size; ++i) {
			printf(" %s \"", ev->environ.values[i].type == TELNET_ENVIRON_VAR ? "VAR" : "USERVAR");
			if (ev->environ.values[i].var != 0) {
				print_encode(ev->environ.values[i].var, strlen(ev->environ.values[i].var));
			}
			printf("\"");
			if (ev->environ.cmd != TELNET_ENVIRON_SEND) {
				printf("=\"");
				if (ev->environ.values[i].value != 0) {
					print_encode(ev->environ.values[i].value, strlen(ev->environ.values[i].value));
				}
				printf("\"");
			}
		}
		printf("\n");
		break;
	case TELNET_EV_MSSP:
		printf("MSSP [%zi] ==>", ev->mssp.size);
		for (i = 0; i != ev->mssp.size; ++i) {
			printf(" \"");
			print_encode(ev->mssp.values[i].var, strlen(ev->mssp.values[i].var));
			printf("\"=\"");
			print_encode(ev->mssp.values[i].value, strlen(ev->mssp.values[i].value));
			printf("\"");
		}
		printf("\n");
		break;
	case TELNET_EV_COMPRESS:
		printf("COMPRESSION %s\n", ev->compress.state ? "ON" : "OFF");
		break;
	case TELNET_EV_WARNING:
		printf("WARNING: %s\n", ev->error.msg);
		break;
	case TELNET_EV_ERROR:
		printf("ERROR: %s\n", ev->error.msg);
		break;
	}
}

int main(int argc, char** argv) {
	FILE *fh;
	telnet_t *telnet;
	char buffer[4096];
	size_t len;

	/* check for a requested input file */
	if (argc != 2) {
		fprintf(stderr, "Usage: telnet-test [test file]\n");
		return 1;
	}

	/* open requested file */
	if ((fh = fopen(argv[1], "rt")) == NULL) {
		fprintf(stderr, "Failed to open %s: %s\n",
				argv[1], strerror(errno));
		return 2;
	}

	/* create telnet parser instance */
	if ((telnet = telnet_init(telopts, event_print, 0,
			NULL)) == 0) {
		fprintf(stderr, "Failed to initialize libtelnet: %s\n",
				strerror(errno));
		return 3;
	}

	/* read input until we hit EOF or marker */
	while (fgets(buffer, sizeof(buffer), fh) != NULL && strcmp(buffer, "%%\n") != 0) {
		if (buffer[0] != '#') {
			len = strlen(buffer);
			decode(buffer, &len);
			telnet_recv(telnet, buffer, len);
		}
	}

	/* clean up */
	telnet_free(telnet);
	fclose(fh);

	return 0;
}