source: ntrip/trunk/ntripclient/NtripLinuxClient.c@ 350

Last change on this file since 350 was 339, checked in by stoecker, 18 years ago

fixed illegal zero byte
File size: 11.2 KB
Line 
1/*
2 Easy example NTRIP client for Linux/Unix.
3 $Id: NtripLinuxClient.c,v 1.22 2006/11/23 14:39:50 stoecker Exp $
4 Copyright (C) 2003-2005 by Dirk Stoecker <soft@dstoecker.de>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 or read http://www.gnu.org/licenses/gpl.txt
20*/
21
22#include <ctype.h>
23#include <getopt.h>
24#include <signal.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <unistd.h>
28#include <errno.h>
29#include <string.h>
30#include <netdb.h>
31#include <sys/types.h>
32#include <netinet/in.h>
33#include <sys/socket.h>
34#include <time.h>
35
36/* The string, which is send as agent in HTTP request */
37#define AGENTSTRING "NTRIP NtripLinuxClient"
38
39#define MAXDATASIZE 1000 /* max number of bytes we can get at once */
40#define ALARMTIME (2*60)
41
42/* CVS revision and version */
43static char revisionstr[] = "$Revision: 1.22 $";
44static char datestr[] = "$Date: 2006/11/23 14:39:50 $";
45
46struct Args
47{
48 const char *server;
49 int port;
50 const char *user;
51 const char *password;
52 const char *data;
53 int bitrate;
54};
55
56/* option parsing */
57#ifdef NO_LONG_OPTS
58#define LONG_OPT(a)
59#else
60#define LONG_OPT(a) a
61static struct option opts[] = {
62{ "bitrate", no_argument, 0, 'b'},
63{ "data", required_argument, 0, 'd'},
64{ "server", required_argument, 0, 's'},
65{ "password", required_argument, 0, 'p'},
66{ "port", required_argument, 0, 'r'},
67{ "user", required_argument, 0, 'u'},
68{ "help", no_argument, 0, 'h'},
69{0,0,0,0}};
70#endif
71#define ARGOPT "-d:bhp:r:s:u:"
72
73#ifdef __GNUC__
74static __attribute__ ((noreturn)) void sighandler_alarm(
75int sig __attribute__((__unused__)))
76#else /* __GNUC__ */
77static void sighandler_alarm(int sig)
78#endif /* __GNUC__ */
79{
80 fprintf(stderr, "ERROR: more than %d seconds no activity\n", ALARMTIME);
81 exit(1);
82}
83
84static const char *geturl(const char *url, struct Args *args)
85{
86 static char buf[1000];
87 static char *Buffer = buf;
88 static char *Bufend = buf+sizeof(buf);
89
90 if(strncmp("ntrip:", url, 6))
91 return "URL must start with 'ntrip:'.";
92 url += 6; /* skip ntrip: */
93
94 if(*url != '@' && *url != '/')
95 {
96 /* scan for mountpoint */
97 args->data = Buffer;
98 while(*url && *url != '@' && *url != '/' && Buffer != Bufend)
99 *(Buffer++) = *(url++);
100 if(Buffer == args->data)
101 return "Mountpoint required.";
102 else if(Buffer >= Bufend-1)
103 return "Parsing buffer too short.";
104 *(Buffer++) = 0;
105 }
106
107 if(*url == '/') /* username and password */
108 {
109 ++url;
110 args->user = Buffer;
111 while(*url && *url != '@' && *url != ':' && Buffer != Bufend)
112 *(Buffer++) = *(url++);
113 if(Buffer == args->user)
114 return "Username cannot be empty.";
115 else if(Buffer >= Bufend-1)
116 return "Parsing buffer too short.";
117 *(Buffer++) = 0;
118
119 if(*url == ':') ++url;
120
121 args->password = Buffer;
122 while(*url && *url != '@' && Buffer != Bufend)
123 *(Buffer++) = *(url++);
124 if(Buffer == args->password)
125 return "Password cannot be empty.";
126 else if(Buffer >= Bufend-1)
127 return "Parsing buffer too short.";
128 *(Buffer++) = 0;
129 }
130
131 if(*url == '@') /* server */
132 {
133 ++url;
134 args->server = Buffer;
135 while(*url && *url != ':' && Buffer != Bufend)
136 *(Buffer++) = *(url++);
137 if(Buffer == args->server)
138 return "Servername cannot be empty.";
139 else if(Buffer >= Bufend-1)
140 return "Parsing buffer too short.";
141 *(Buffer++) = 0;
142
143 if(*url == ':')
144 {
145 char *s2 = 0;
146 args->port = strtol(++url, &s2, 10);
147 if(*s2 || args->port <= 0 || args->port > 0xFFFF)
148 return "Illegal port number.";
149 url = s2;
150 }
151 }
152
153 return *url ? "Garbage at end of server string." : 0;
154}
155
156static int getargs(int argc, char **argv, struct Args *args)
157{
158 int res = 1;
159 int getoptr;
160 char *a;
161 int i = 0, help = 0;
162 char *t;
163
164 args->server = "www.euref-ip.net";
165 args->port = 2101;
166 args->user = "";
167 args->password = "";
168 args->data = 0;
169 args->bitrate = 0;
170 help = 0;
171
172 do
173 {
174#ifdef NO_LONG_OPTS
175 switch((getoptr = getopt(argc, argv, ARGOPT)))
176#else
177 switch((getoptr = getopt_long(argc, argv, ARGOPT, opts, 0)))
178#endif
179 {
180 case 's': args->server = optarg; break;
181 case 'u': args->user = optarg; break;
182 case 'p': args->password = optarg; break;
183 case 'd': args->data = optarg; break;
184 case 'b': args->bitrate = 1; break;
185 case 'h': help=1; break;
186 case 1:
187 {
188 const char *err;
189 if((err = geturl(optarg, args)))
190 {
191 fprintf(stderr, "%s\n\n", err);
192 res = 0;
193 }
194 }
195 break;
196 case 'r':
197 args->port = strtoul(optarg, &t, 10);
198 if((t && *t) || args->port < 1 || args->port > 65535)
199 res = 0;
200 break;
201 case -1: break;
202 }
203 } while(getoptr != -1 && res);
204
205 for(a = revisionstr+11; *a && *a != ' '; ++a)
206 revisionstr[i++] = *a;
207 revisionstr[i] = 0;
208 datestr[0] = datestr[7];
209 datestr[1] = datestr[8];
210 datestr[2] = datestr[9];
211 datestr[3] = datestr[10];
212 datestr[5] = datestr[12];
213 datestr[6] = datestr[13];
214 datestr[8] = datestr[15];
215 datestr[9] = datestr[16];
216 datestr[4] = datestr[7] = '-';
217 datestr[10] = 0;
218
219 if(!res || help)
220 {
221 fprintf(stderr, "Version %s (%s) GPL\nUsage:\n%s -s server -u user ...\n"
222 " -d " LONG_OPT("--data ") "the requested data set\n"
223 " -s " LONG_OPT("--server ") "the server name or address\n"
224 " -p " LONG_OPT("--password ") "the login password\n"
225 " -r " LONG_OPT("--port ") "the server port number (default 2101)\n"
226 " -u " LONG_OPT("--user ") "the user name\n"
227 " -b " LONG_OPT("--bitrate ") "output bitrate\n"
228 "or using an URL:\n%s ntrip:mountpoint[/username[:password]][@server[:port]]\n"
229 , revisionstr, datestr, argv[0], argv[0]);
230 exit(1);
231 }
232 return res;
233}
234
235static const char encodingTable [64] = {
236 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
237 'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
238 'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
239 'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/'
240};
241
242/* does not buffer overrun, but breaks directly after an error */
243/* returns the number of required bytes */
244static int encode(char *buf, int size, const char *user, const char *pwd)
245{
246 unsigned char inbuf[3];
247 char *out = buf;
248 int i, sep = 0, fill = 0, bytes = 0;
249
250 while(*user || *pwd)
251 {
252 i = 0;
253 while(i < 3 && *user) inbuf[i++] = *(user++);
254 if(i < 3 && !sep) {inbuf[i++] = ':'; ++sep; }
255 while(i < 3 && *pwd) inbuf[i++] = *(pwd++);
256 while(i < 3) {inbuf[i++] = 0; ++fill; }
257 if(out-buf < size-1)
258 *(out++) = encodingTable[(inbuf [0] & 0xFC) >> 2];
259 if(out-buf < size-1)
260 *(out++) = encodingTable[((inbuf [0] & 0x03) << 4)
261 | ((inbuf [1] & 0xF0) >> 4)];
262 if(out-buf < size-1)
263 {
264 if(fill == 2)
265 *(out++) = '=';
266 else
267 *(out++) = encodingTable[((inbuf [1] & 0x0F) << 2)
268 | ((inbuf [2] & 0xC0) >> 6)];
269 }
270 if(out-buf < size-1)
271 {
272 if(fill >= 1)
273 *(out++) = '=';
274 else
275 *(out++) = encodingTable[inbuf [2] & 0x3F];
276 }
277 bytes += 4;
278 }
279 if(out-buf < size)
280 *out = 0;
281 return bytes;
282}
283
284int main(int argc, char **argv)
285{
286 struct Args args;
287
288 setbuf(stdout, 0);
289 setbuf(stdin, 0);
290 setbuf(stderr, 0);
291 signal(SIGALRM,sighandler_alarm);
292 alarm(ALARMTIME);
293
294 if(getargs(argc, argv, &args))
295 {
296 int i, sockfd, numbytes;
297 char buf[MAXDATASIZE];
298 struct hostent *he;
299 struct sockaddr_in their_addr; /* connector's address information */
300
301 if(!(he=gethostbyname(args.server)))
302 {
303 fprintf(stderr, "Server name lookup failed for '%s'.\n", args.server);
304 exit(1);
305 }
306 if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
307 {
308 perror("socket");
309 exit(1);
310 }
311 their_addr.sin_family = AF_INET; /* host byte order */
312 their_addr.sin_port = htons(args.port); /* short, network byte order */
313 their_addr.sin_addr = *((struct in_addr *)he->h_addr);
314 memset(&(their_addr.sin_zero), '\0', 8);
315 if(connect(sockfd, (struct sockaddr *)&their_addr,
316 sizeof(struct sockaddr)) == -1)
317 {
318 perror("connect");
319 exit(1);
320 }
321
322 if(!args.data)
323 {
324 i = snprintf(buf, MAXDATASIZE,
325 "GET / HTTP/1.0\r\n"
326 "User-Agent: %s/%s\r\n"
327#ifdef UNUSED
328 "Accept: */*\r\n"
329 "Connection: close\r\n"
330#endif
331 "\r\n"
332 , AGENTSTRING, revisionstr);
333 }
334 else
335 {
336 i=snprintf(buf, MAXDATASIZE-40, /* leave some space for login */
337 "GET /%s HTTP/1.0\r\n"
338 "User-Agent: %s/%s\r\n"
339#ifdef UNUSED
340 "Accept: */*\r\n"
341 "Connection: close\r\n"
342#endif
343 "Authorization: Basic "
344 , args.data, AGENTSTRING, revisionstr);
345 if(i > MAXDATASIZE-40 || i < 0) /* second check for old glibc */
346 {
347 fprintf(stderr, "Requested data too long\n");
348 exit(1);
349 }
350 i += encode(buf+i, MAXDATASIZE-i-4, args.user, args.password);
351 if(i > MAXDATASIZE-4)
352 {
353 fprintf(stderr, "Username and/or password too long\n");
354 exit(1);
355 }
356 buf[i++] = '\r';
357 buf[i++] = '\n';
358 buf[i++] = '\r';
359 buf[i++] = '\n';
360 }
361 if(send(sockfd, buf, (size_t)i, 0) != i)
362 {
363 perror("send");
364 exit(1);
365 }
366 if(args.data)
367 {
368 int k = 0;
369 int starttime = time(0);
370 int lastout = starttime;
371 int totalbytes = 0;
372
373 while((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) != -1)
374 {
375 alarm(ALARMTIME);
376 if(!k)
377 {
378 if(numbytes < 12 || strncmp("ICY 200 OK\r\n", buf, 12))
379 {
380 fprintf(stderr, "Could not get the requested data: ");
381 for(k = 0; k < numbytes && buf[k] != '\n' && buf[k] != '\r'; ++k)
382 {
383 fprintf(stderr, "%c", isprint(buf[k]) ? buf[k] : '.');
384 }
385 fprintf(stderr, "\n");
386 exit(1);
387 }
388 ++k;
389 }
390 else
391 {
392 totalbytes += numbytes;
393 if(totalbytes < 0) /* overflow */
394 {
395 totalbytes = 0;
396 starttime = time(0);
397 lastout = starttime;
398 }
399 fwrite(buf, (size_t)numbytes, 1, stdout);
400 fflush(stdout);
401 if(args.bitrate)
402 {
403 int t = time(0);
404 if(t > lastout + 60)
405 {
406 lastout = t;
407 fprintf(stderr, "Bitrate is %d/s (%d seconds accumulated).\n",
408 totalbytes/(t-starttime), t-starttime);
409 }
410 }
411 }
412 }
413 }
414 else
415 {
416 while((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) > 0)
417 {
418 fwrite(buf, (size_t)numbytes, 1, stdout);
419 }
420 }
421
422 close(sockfd);
423 }
424 return 0;
425}
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