source: ntrip/trunk/ntripclient/ntripclient.c@ 656

Last change on this file since 656 was 598, checked in by stoecker, 17 years ago

added Connection: close
File size: 30.7 KB
Line 
1/*
2 Easy example NTRIP client for POSIX.
3 $Id: ntripclient.c,v 1.38 2007/12/12 09:47:31 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 <stdio.h>
25#include <stdlib.h>
26#include <errno.h>
27#include <string.h>
28#include <time.h>
29
30#ifdef WINDOWSVERSION
31 #include <winsock.h>
32 typedef SOCKET sockettype;
33 typedef u_long in_addr_t;
34 typedef size_t socklen_t;
35#else
36 typedef int sockettype;
37 #include <signal.h>
38 #include <fcntl.h>
39 #include <unistd.h>
40 #include <arpa/inet.h>
41 #include <sys/socket.h>
42 #include <netinet/in.h>
43 #include <netdb.h>
44
45 #define closesocket(sock) close(sock)
46 #define ALARMTIME (2*60)
47#endif
48
49#ifndef COMPILEDATE
50#define COMPILEDATE " built " __DATE__
51#endif
52
53/* The string, which is send as agent in HTTP request */
54#define AGENTSTRING "NTRIP NtripClientPOSIX"
55
56#define MAXDATASIZE 1000 /* max number of bytes we can get at once */
57
58/* CVS revision and version */
59static char revisionstr[] = "$Revision: 1.38 $";
60static char datestr[] = "$Date: 2007/12/12 09:47:31 $";
61
62enum MODE { HTTP = 1, RTSP = 2, NTRIP1 = 3, AUTO = 4, END };
63
64struct Args
65{
66 const char *server;
67 const char *port;
68 const char *user;
69 const char *proxyhost;
70 const char *proxyport;
71 const char *password;
72 const char *nmea;
73 const char *data;
74 int bitrate;
75 int mode;
76
77 int udpport;
78 int initudp;
79};
80
81/* option parsing */
82#ifdef NO_LONG_OPTS
83#define LONG_OPT(a)
84#else
85#define LONG_OPT(a) a
86static struct option opts[] = {
87{ "bitrate", no_argument, 0, 'b'},
88{ "data", required_argument, 0, 'd'}, /* compatibility */
89{ "mountpoint", required_argument, 0, 'm'},
90{ "initudp", no_argument, 0, 'I'},
91{ "udpport", required_argument, 0, 'P'},
92{ "server", required_argument, 0, 's'},
93{ "password", required_argument, 0, 'p'},
94{ "port", required_argument, 0, 'r'},
95{ "proxyport", required_argument, 0, 'R'},
96{ "proxyhost", required_argument, 0, 'S'},
97{ "user", required_argument, 0, 'u'},
98{ "nmea", required_argument, 0, 'n'},
99{ "mode", required_argument, 0, 'M'},
100{ "help", no_argument, 0, 'h'},
101{0,0,0,0}};
102#endif
103#define ARGOPT "-d:m:bhp:r:s:u:n:S:R:M:IP:"
104
105int stop = 0;
106#ifndef WINDOWSVERSION
107#ifdef __GNUC__
108static __attribute__ ((noreturn)) void sighandler_alarm(
109int sig __attribute__((__unused__)))
110#else /* __GNUC__ */
111static void sighandler_alarm(int sig)
112#endif /* __GNUC__ */
113{
114 fprintf(stderr, "ERROR: more than %d seconds no activity\n", ALARMTIME);
115 exit(1);
116}
117
118#ifdef __GNUC__
119static void sighandler_int(int sig __attribute__((__unused__)))
120#else /* __GNUC__ */
121static void sighandler_alarm(int sig)
122#endif /* __GNUC__ */
123{
124 alarm(2);
125 stop = 1;
126}
127#endif /* WINDOWSVERSION */
128
129static const char *encodeurl(const char *req)
130{
131 char *h = "0123456789abcdef";
132 static char buf[128];
133 char *urlenc = buf;
134 char *bufend = buf + sizeof(buf) - 3;
135
136 while(*req && urlenc < bufend)
137 {
138 if(isalnum(*req)
139 || *req == '-' || *req == '_' || *req == '.')
140 *urlenc++ = *req++;
141 else
142 {
143 *urlenc++ = '%';
144 *urlenc++ = h[*req >> 4];
145 *urlenc++ = h[*req & 0x0f];
146 req++;
147 }
148 }
149 *urlenc = 0;
150 return buf;
151}
152
153static const char *geturl(const char *url, struct Args *args)
154{
155 static char buf[1000];
156 static char *Buffer = buf;
157 static char *Bufend = buf+sizeof(buf);
158 char *h = "0123456789abcdef";
159
160 if(strncmp("ntrip:", url, 6))
161 return "URL must start with 'ntrip:'.";
162 url += 6; /* skip ntrip: */
163
164 if(*url != '@' && *url != '/')
165 {
166 /* scan for mountpoint */
167 args->data = Buffer;
168 if(*url != '?')
169 {
170 while(*url && *url != '@' && *url != ';' && *url != '/' && Buffer != Bufend)
171 *(Buffer++) = *(url++);
172 }
173 else
174 {
175 while(*url && *url != '@' && *url != '/' && Buffer != Bufend)
176 {
177 if(isalnum(*url) || *url == '-' || *url == '_' || *url == '.')
178 *Buffer++ = *url++;
179 else
180 {
181 *Buffer++ = '%';
182 *Buffer++ = h[*url >> 4];
183 *Buffer++ = h[*url & 0x0f];
184 url++;
185 }
186 }
187 }
188 if(Buffer == args->data)
189 return "Mountpoint required.";
190 else if(Buffer >= Bufend-1)
191 return "Parsing buffer too short.";
192 *(Buffer++) = 0;
193 }
194
195 if(*url == '/') /* username and password */
196 {
197 ++url;
198 args->user = Buffer;
199 while(*url && *url != '@' && *url != ';' && *url != ':' && Buffer != Bufend)
200 *(Buffer++) = *(url++);
201 if(Buffer == args->user)
202 return "Username cannot be empty.";
203 else if(Buffer >= Bufend-1)
204 return "Parsing buffer too short.";
205 *(Buffer++) = 0;
206
207 if(*url == ':') ++url;
208
209 args->password = Buffer;
210 while(*url && *url != '@' && *url != ';' && Buffer != Bufend)
211 *(Buffer++) = *(url++);
212 if(Buffer == args->password)
213 return "Password cannot be empty.";
214 else if(Buffer >= Bufend-1)
215 return "Parsing buffer too short.";
216 *(Buffer++) = 0;
217 }
218
219 if(*url == '@') /* server */
220 {
221 ++url;
222 if(*url != '@' && *url != ':')
223 {
224 args->server = Buffer;
225 while(*url && *url != '@' && *url != ':' && *url != ';' && Buffer != Bufend)
226 *(Buffer++) = *(url++);
227 if(Buffer == args->server)
228 return "Servername cannot be empty.";
229 else if(Buffer >= Bufend-1)
230 return "Parsing buffer too short.";
231 *(Buffer++) = 0;
232 }
233
234 if(*url == ':')
235 {
236 ++url;
237 args->port = Buffer;
238 while(*url && *url != '@' && *url != ';' && Buffer != Bufend)
239 *(Buffer++) = *(url++);
240 if(Buffer == args->port)
241 return "Port cannot be empty.";
242 else if(Buffer >= Bufend-1)
243 return "Parsing buffer too short.";
244 *(Buffer++) = 0;
245 }
246
247 if(*url == '@') /* proxy */
248 {
249 ++url;
250 args->proxyhost = Buffer;
251 while(*url && *url != ':' && *url != ';' && Buffer != Bufend)
252 *(Buffer++) = *(url++);
253 if(Buffer == args->proxyhost)
254 return "Proxy servername cannot be empty.";
255 else if(Buffer >= Bufend-1)
256 return "Parsing buffer too short.";
257 *(Buffer++) = 0;
258
259 if(*url == ':')
260 {
261 ++url;
262 args->proxyport = Buffer;
263 while(*url && *url != ';' && Buffer != Bufend)
264 *(Buffer++) = *(url++);
265 if(Buffer == args->proxyport)
266 return "Proxy port cannot be empty.";
267 else if(Buffer >= Bufend-1)
268 return "Parsing buffer too short.";
269 *(Buffer++) = 0;
270 }
271 }
272 }
273 if(*url == ';') /* NMEA */
274 {
275 args->nmea = ++url;
276 while(*url)
277 ++url;
278 }
279
280 return *url ? "Garbage at end of server string." : 0;
281}
282
283static int getargs(int argc, char **argv, struct Args *args)
284{
285 int res = 1;
286 int getoptr;
287 char *a;
288 int i = 0, help = 0;
289
290 args->server = "www.euref-ip.net";
291 args->port = "2101";
292 args->user = "";
293 args->password = "";
294 args->nmea = 0;
295 args->data = 0;
296 args->bitrate = 0;
297 args->proxyhost = 0;
298 args->proxyport = "2101";
299 args->mode = AUTO;
300 args->initudp = 0;
301 args->udpport = 0;
302 help = 0;
303
304 do
305 {
306#ifdef NO_LONG_OPTS
307 switch((getoptr = getopt(argc, argv, ARGOPT)))
308#else
309 switch((getoptr = getopt_long(argc, argv, ARGOPT, opts, 0)))
310#endif
311 {
312 case 's': args->server = optarg; break;
313 case 'u': args->user = optarg; break;
314 case 'p': args->password = optarg; break;
315 case 'd':
316 case 'm':
317 if(optarg && *optarg == '?')
318 args->data = encodeurl(optarg);
319 else
320 args->data = optarg;
321 break;
322 case 'I': args->initudp = 1; break;
323 case 'P': args->udpport = strtol(optarg, 0, 10); break;
324 case 'n': args->nmea = optarg; break;
325 case 'b': args->bitrate = 1; break;
326 case 'h': help=1; break;
327 case 'r': args->port = optarg; break;
328 case 'S': args->proxyhost = optarg; break;
329 case 'R': args->proxyport = optarg; break;
330 case 'M':
331 args->mode = 0;
332 if (!strcmp(optarg,"n") || !strcmp(optarg,"ntrip1"))
333 args->mode = NTRIP1;
334 else if(!strcmp(optarg,"h") || !strcmp(optarg,"http"))
335 args->mode = HTTP;
336 else if(!strcmp(optarg,"r") || !strcmp(optarg,"rtsp"))
337 args->mode = RTSP;
338 else if(!strcmp(optarg,"a") || !strcmp(optarg,"auto"))
339 args->mode = AUTO;
340 else args->mode = atoi(optarg);
341 if((args->mode == 0) || (args->mode >= END))
342 {
343 fprintf(stderr, "Mode %s unknown\n", optarg);
344 res = 0;
345 }
346 break;
347 case 1:
348 {
349 const char *err;
350 if((err = geturl(optarg, args)))
351 {
352 fprintf(stderr, "%s\n\n", err);
353 res = 0;
354 }
355 }
356 break;
357 case -1: break;
358 }
359 } while(getoptr != -1 && res);
360
361 for(a = revisionstr+11; *a && *a != ' '; ++a)
362 revisionstr[i++] = *a;
363 revisionstr[i] = 0;
364 datestr[0] = datestr[7];
365 datestr[1] = datestr[8];
366 datestr[2] = datestr[9];
367 datestr[3] = datestr[10];
368 datestr[5] = datestr[12];
369 datestr[6] = datestr[13];
370 datestr[8] = datestr[15];
371 datestr[9] = datestr[16];
372 datestr[4] = datestr[7] = '-';
373 datestr[10] = 0;
374
375 if(!res || help)
376 {
377 fprintf(stderr, "Version %s (%s) GPL" COMPILEDATE "\nUsage:\n%s -s server -u user ...\n"
378 " -m " LONG_OPT("--mountpoint ") "the requested data set or sourcetable filtering criteria\n"
379 " -s " LONG_OPT("--server ") "the server name or address\n"
380 " -p " LONG_OPT("--password ") "the login password\n"
381 " -r " LONG_OPT("--port ") "the server port number (default 2101)\n"
382 " -u " LONG_OPT("--user ") "the user name\n"
383 " -n " LONG_OPT("--nmea ") "NMEA string for sending to server\n"
384 " -b " LONG_OPT("--bitrate ") "output bitrate\n"
385 " -S " LONG_OPT("--proxyhost ") "proxy name or address\n"
386 " -R " LONG_OPT("--proxyport ") "proxy port, optional (default 2101)\n"
387 " -M " LONG_OPT("--mode ") "mode for data request\n"
388 " Valid modes are:\n"
389 " 1, h, http NTRIP Version 2.0 Caster in TCP/IP mode\n"
390 " 2, r, rtsp NTRIP Version 2.0 Caster in RTSP/RTP mode\n"
391 " 3, n, ntrip1 NTRIP Version 1.0 Caster\n"
392 " 4, a, auto automatic detection (default)\n"
393 "or using an URL:\n%s ntrip:mountpoint[/user[:password]][@[server][:port][@proxyhost[:proxyport]]][;nmea]\n"
394 , revisionstr, datestr, argv[0], argv[0]);
395 exit(1);
396 }
397 return res;
398}
399
400static const char encodingTable [64] = {
401 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
402 'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
403 'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
404 'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/'
405};
406
407/* does not buffer overrun, but breaks directly after an error */
408/* returns the number of required bytes */
409static int encode(char *buf, int size, const char *user, const char *pwd)
410{
411 unsigned char inbuf[3];
412 char *out = buf;
413 int i, sep = 0, fill = 0, bytes = 0;
414
415 while(*user || *pwd)
416 {
417 i = 0;
418 while(i < 3 && *user) inbuf[i++] = *(user++);
419 if(i < 3 && !sep) {inbuf[i++] = ':'; ++sep; }
420 while(i < 3 && *pwd) inbuf[i++] = *(pwd++);
421 while(i < 3) {inbuf[i++] = 0; ++fill; }
422 if(out-buf < size-1)
423 *(out++) = encodingTable[(inbuf [0] & 0xFC) >> 2];
424 if(out-buf < size-1)
425 *(out++) = encodingTable[((inbuf [0] & 0x03) << 4)
426 | ((inbuf [1] & 0xF0) >> 4)];
427 if(out-buf < size-1)
428 {
429 if(fill == 2)
430 *(out++) = '=';
431 else
432 *(out++) = encodingTable[((inbuf [1] & 0x0F) << 2)
433 | ((inbuf [2] & 0xC0) >> 6)];
434 }
435 if(out-buf < size-1)
436 {
437 if(fill >= 1)
438 *(out++) = '=';
439 else
440 *(out++) = encodingTable[inbuf [2] & 0x3F];
441 }
442 bytes += 4;
443 }
444 if(out-buf < size)
445 *out = 0;
446 return bytes;
447}
448
449int main(int argc, char **argv)
450{
451 struct Args args;
452
453 setbuf(stdout, 0);
454 setbuf(stdin, 0);
455 setbuf(stderr, 0);
456#ifndef WINDOWSVERSION
457 signal(SIGALRM,sighandler_alarm);
458 signal(SIGINT,sighandler_int);
459 alarm(ALARMTIME);
460#else
461 WSADATA wsaData;
462 if(WSAStartup(MAKEWORD(1,1),&wsaData))
463 {
464 fprintf(stderr, "Could not init network access.\n");
465 return 20;
466 }
467#endif
468
469 if(getargs(argc, argv, &args))
470 {
471 int sleeptime = 0;
472 do
473 {
474 sockettype sockfd;
475 int numbytes;
476 char buf[MAXDATASIZE];
477 struct sockaddr_in their_addr; /* connector's address information */
478 struct hostent *he;
479 struct servent *se;
480 const char *server, *port, *proxyserver = 0;
481 char proxyport[6];
482 char *b;
483 long i;
484 if(sleeptime)
485 {
486#ifdef WINDOWSVERSION
487 Sleep(sleeptime*1000);
488#else
489 sleep(sleeptime);
490#endif
491 sleeptime += 2;
492 }
493 else
494 {
495 sleeptime = 1;
496 }
497#ifndef WINDOWSVERSION
498 alarm(ALARMTIME);
499#endif
500 if(args.proxyhost)
501 {
502 int p;
503 if((i = strtol(args.port, &b, 10)) && (!b || !*b))
504 p = i;
505 else if(!(se = getservbyname(args.port, 0)))
506 {
507 fprintf(stderr, "Can't resolve port %s.", args.port);
508 exit(1);
509 }
510 else
511 {
512 p = ntohs(se->s_port);
513 }
514 snprintf(proxyport, sizeof(proxyport), "%d", p);
515 port = args.proxyport;
516 proxyserver = args.server;
517 server = args.proxyhost;
518 }
519 else
520 {
521 server = args.server;
522 port = args.port;
523 }
524 memset(&their_addr, 0, sizeof(struct sockaddr_in));
525 if((i = strtol(port, &b, 10)) && (!b || !*b))
526 their_addr.sin_port = htons(i);
527 else if(!(se = getservbyname(port, 0)))
528 {
529 fprintf(stderr, "Can't resolve port %s.", port);
530 exit(1);
531 }
532 else
533 {
534 their_addr.sin_port = se->s_port;
535 }
536 if(!(he=gethostbyname(server)))
537 {
538 fprintf(stderr, "Server name lookup failed for '%s'.\n", server);
539 exit(1);
540 }
541 if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
542 {
543 perror("socket");
544 exit(1);
545 }
546 their_addr.sin_family = AF_INET;
547 their_addr.sin_addr = *((struct in_addr *)he->h_addr);
548
549 if(args.data && *args.data != '%' && args.mode == RTSP)
550 {
551 struct sockaddr_in local;
552 int sockudp, localport;
553 int cseq = 1;
554 socklen_t len;
555
556 if((sockudp = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
557 {
558 perror("socket");
559 exit(1);
560 }
561 /* fill structure with local address information for UDP */
562 memset(&local, 0, sizeof(local));
563 local.sin_family = AF_INET;
564 local.sin_port = htons(args.udpport);
565 local.sin_addr.s_addr = htonl(INADDR_ANY);
566 len = sizeof(local);
567 /* bind() in order to get a random RTP client_port */
568 if((bind(sockudp, (struct sockaddr *)&local, len)) < 0)
569 {
570 perror("bind");
571 exit(1);
572 }
573 if((getsockname(sockudp, (struct sockaddr*)&local, &len)) != -1)
574 {
575 localport = ntohs(local.sin_port);
576 }
577 else
578 {
579 perror("local access failed");
580 exit(1);
581 }
582 if(connect(sockfd, (struct sockaddr *)&their_addr,
583 sizeof(struct sockaddr)) == -1)
584 {
585 perror("connect");
586 exit(1);
587 }
588 i=snprintf(buf, MAXDATASIZE-40, /* leave some space for login */
589 "SETUP rtsp://%s%s%s/%s RTSP/1.0\r\n"
590 "CSeq: %d\r\n"
591 "Ntrip-Version: Ntrip/2.0\r\n"
592 "Ntrip-Component: Ntripclient\r\n"
593 "User-Agent: %s/%s\r\n"
594 "Transport: RTP/GNSS;unicast;client_port=%u\r\n"
595 "Authorization: Basic ",
596 args.server, proxyserver ? ":" : "", proxyserver ? args.port : "",
597 args.data, cseq++, AGENTSTRING, revisionstr, localport);
598 if(i > MAXDATASIZE-40 || i < 0) /* second check for old glibc */
599 {
600 fprintf(stderr, "Requested data too long\n");
601 exit(1);
602 }
603 i += encode(buf+i, MAXDATASIZE-i-4, args.user, args.password);
604 if(i > MAXDATASIZE-4)
605 {
606 fprintf(stderr, "Username and/or password too long\n");
607 exit(1);
608 }
609 buf[i++] = '\r';
610 buf[i++] = '\n';
611 buf[i++] = '\r';
612 buf[i++] = '\n';
613 if(args.nmea)
614 {
615 int j = snprintf(buf+i, MAXDATASIZE-i, "%s\r\n", args.nmea);
616 if(j >= 0 && j < MAXDATASIZE-i)
617 i += j;
618 else
619 {
620 fprintf(stderr, "NMEA string too long\n");
621 exit(1);
622 }
623 }
624 if(send(sockfd, buf, (size_t)i, 0) != i)
625 {
626 perror("send");
627 exit(1);
628 }
629 if((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) != -1)
630 {
631 if(numbytes >= 17 && !strncmp(buf, "RTSP/1.0 200 OK\r\n", 17))
632 {
633 int serverport = 0, session = 0;
634 const char *portcheck = "server_port=";
635 const char *sessioncheck = "session: ";
636 int l = strlen(portcheck)-1;
637 int j=0;
638 for(i = 0; j != l && i < numbytes-l; ++i)
639 {
640 for(j = 0; j < l && tolower(buf[i+j]) == portcheck[j]; ++j)
641 ;
642 }
643 if(i == numbytes-l)
644 {
645 fprintf(stderr, "No server port number found\n");
646 exit(1);
647 }
648 else
649 {
650 i+=l;
651 while(i < numbytes && buf[i] >= '0' && buf[i] <= '9')
652 serverport = serverport * 10 + buf[i++]-'0';
653 if(buf[i] != '\r' && buf[i] != ';')
654 {
655 fprintf(stderr, "Could not extract server port\n");
656 exit(1);
657 }
658 }
659 l = strlen(sessioncheck)-1;
660 j=0;
661 for(i = 0; j != l && i < numbytes-l; ++i)
662 {
663 for(j = 0; j < l && tolower(buf[i+j]) == sessioncheck[j]; ++j)
664 ;
665 }
666 if(i == numbytes-l)
667 {
668 fprintf(stderr, "No session number found\n");
669 exit(1);
670 }
671 else
672 {
673 i+=l;
674 while(i < numbytes && buf[i] >= '0' && buf[i] <= '9')
675 session = session * 10 + buf[i++]-'0';
676 if(buf[i] != '\r')
677 {
678 fprintf(stderr, "Could not extract session number\n");
679 exit(1);
680 }
681 }
682 if(args.initudp)
683 {
684 printf("Sending initial UDP packet\n");
685 struct sockaddr_in casterRTP;
686 char rtpbuffer[12];
687 int i;
688 rtpbuffer[0] = (2<<6);
689 /* padding, extension, csrc are empty */
690 rtpbuffer[1] = 96;
691 /* marker is empty */
692 rtpbuffer[2] = 0;
693 rtpbuffer[3] = 0;
694 rtpbuffer[4] = 0;
695 rtpbuffer[5] = 0;
696 rtpbuffer[6] = 0;
697 rtpbuffer[7] = 0;
698 rtpbuffer[8] = 0;
699 rtpbuffer[9] = 0;
700 rtpbuffer[10] = 0;
701 rtpbuffer[11] = 0;
702 /* fill structure with caster address information for UDP */
703 memset(&casterRTP, 0, sizeof(casterRTP));
704 casterRTP.sin_family = AF_INET;
705 casterRTP.sin_port = htons(serverport);
706 casterRTP.sin_addr = *((struct in_addr *)he->h_addr);
707
708 if((i = sendto(sockudp, rtpbuffer, 12, 0,
709 (struct sockaddr *) &casterRTP, sizeof(casterRTP))) != 12)
710 perror("WARNING: could not send initial UDP packet");
711 }
712
713 i = snprintf(buf, MAXDATASIZE,
714 "PLAY rtsp://%s%s%s/%s RTSP/1.0\r\n"
715 "CSeq: %d\r\n"
716 "Session: %d\r\n"
717 "\r\n",
718 args.server, proxyserver ? ":" : "", proxyserver ? args.port : "",
719 args.data, cseq++, session);
720
721 if(i > MAXDATASIZE || i < 0) /* second check for old glibc */
722 {
723 fprintf(stderr, "Requested data too long\n");
724 exit(1);
725 }
726 if(send(sockfd, buf, (size_t)i, 0) != i)
727 {
728 perror("send");
729 exit(1);
730 }
731 if((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) != -1)
732 {
733 if(numbytes >= 17 && !strncmp(buf, "RTSP/1.0 200 OK\r\n", 17))
734 {
735 struct sockaddr_in addrRTP;
736 /* fill structure with caster address information for UDP */
737 memset(&addrRTP, 0, sizeof(addrRTP));
738 addrRTP.sin_family = AF_INET;
739 addrRTP.sin_port = htons(serverport);
740 their_addr.sin_addr = *((struct in_addr *)he->h_addr);
741 len = sizeof(addrRTP);
742 int ts = 0;
743 int sn = 0;
744 int ssrc = 0;
745 int init = 0;
746 int u, v, w;
747 while(!stop && (i = recvfrom(sockudp, buf, 1526, 0,
748 (struct sockaddr*) &addrRTP, &len)) > 0)
749 {
750#ifndef WINDOWSVERSION
751 alarm(ALARMTIME);
752#endif
753 if(i >= 12+1 && (unsigned char)buf[0] == (2 << 6) && buf[1] == 0x60)
754 {
755 u= ((unsigned char)buf[2]<<8)+(unsigned char)buf[3];
756 v = ((unsigned char)buf[4]<<24)+((unsigned char)buf[5]<<16)
757 +((unsigned char)buf[6]<<8)+(unsigned char)buf[7];
758 w = ((unsigned char)buf[8]<<24)+((unsigned char)buf[9]<<16)
759 +((unsigned char)buf[10]<<8)+(unsigned char)buf[11];
760
761 if(init)
762 {
763 if(u < -30000 && sn > 30000) sn -= 0xFFFF;
764 if(ssrc != w || ts > v)
765 {
766 fprintf(stderr, "Illegal UDP data received.\n");
767 exit(1);
768 }
769 if(u > sn) /* don't show out-of-order packets */
770 fwrite(buf+12, (size_t)i-12, 1, stdout);
771 }
772 sn = u; ts = v; ssrc = w; init = 1;
773 }
774 else
775 {
776 fprintf(stderr, "Illegal UDP header.\n");
777 exit(1);
778 }
779 }
780 }
781 i = snprintf(buf, MAXDATASIZE,
782 "TEARDOWN rtsp://%s%s%s/%s RTSP/1.0\r\n"
783 "CSeq: %d\r\n"
784 "Session: %d\r\n"
785 "\r\n",
786 args.server, proxyserver ? ":" : "", proxyserver ? args.port : "",
787 args.data, cseq++, session);
788
789 if(i > MAXDATASIZE || i < 0) /* second check for old glibc */
790 {
791 fprintf(stderr, "Requested data too long\n");
792 exit(1);
793 }
794 if(send(sockfd, buf, (size_t)i, 0) != i)
795 {
796 perror("send");
797 exit(1);
798 }
799 }
800 else
801 {
802 fprintf(stderr, "Could not start data stream.\n");
803 exit(1);
804 }
805 }
806 else
807 {
808 fprintf(stderr, "Could not setup initial control connection.\n");
809 exit(1);
810 }
811 }
812 else
813 {
814 perror("recv");
815 exit(1);
816 }
817 }
818 else
819 {
820 if(connect(sockfd, (struct sockaddr *)&their_addr,
821 sizeof(struct sockaddr)) == -1)
822 {
823 perror("connect");
824 exit(1);
825 }
826 if(!args.data)
827 {
828 i = snprintf(buf, MAXDATASIZE,
829 "GET %s%s%s%s/ HTTP/1.0\r\n"
830 "Host: %s\r\n%s"
831 "User-Agent: %s/%s\r\n"
832 "Connection: close\r\n"
833 "\r\n"
834 , proxyserver ? "http://" : "", proxyserver ? proxyserver : "",
835 proxyserver ? ":" : "", proxyserver ? proxyport : "",
836 args.server, args.mode == NTRIP1 ? "" : "Ntrip-Version: Ntrip/2.0\r\n",
837 AGENTSTRING, revisionstr);
838 }
839 else
840 {
841 i=snprintf(buf, MAXDATASIZE-40, /* leave some space for login */
842 "GET %s%s%s%s/%s HTTP/1.0\r\n"
843 "Host: %s\r\n%s"
844 "User-Agent: %s/%s\r\n"
845 "Connection: close\r\n"
846 "Authorization: Basic "
847 , proxyserver ? "http://" : "", proxyserver ? proxyserver : "",
848 proxyserver ? ":" : "", proxyserver ? proxyport : "",
849 args.data, args.server,
850 args.mode == NTRIP1 ? "" : "Ntrip-Version: Ntrip/2.0\r\n",
851 AGENTSTRING, revisionstr);
852 if(i > MAXDATASIZE-40 || i < 0) /* second check for old glibc */
853 {
854 fprintf(stderr, "Requested data too long\n");
855 exit(1);
856 }
857 i += encode(buf+i, MAXDATASIZE-i-4, args.user, args.password);
858 if(i > MAXDATASIZE-4)
859 {
860 fprintf(stderr, "Username and/or password too long\n");
861 exit(1);
862 }
863 buf[i++] = '\r';
864 buf[i++] = '\n';
865 buf[i++] = '\r';
866 buf[i++] = '\n';
867 if(args.nmea)
868 {
869 int j = snprintf(buf+i, MAXDATASIZE-i, "%s\r\n", args.nmea);
870 if(j >= 0 && j < MAXDATASIZE-i)
871 i += j;
872 else
873 {
874 fprintf(stderr, "NMEA string too long\n");
875 exit(1);
876 }
877 }
878 }
879 if(send(sockfd, buf, (size_t)i, 0) != i)
880 {
881 perror("send");
882 exit(1);
883 }
884 if(args.data && *args.data != '%')
885 {
886 int k = 0;
887 int chunkymode = 0;
888 int starttime = time(0);
889 int lastout = starttime;
890 int totalbytes = 0;
891 int chunksize = 0;
892
893 while(!stop && (numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) > 0)
894 {
895#ifndef WINDOWSVERSION
896 alarm(ALARMTIME);
897#endif
898 if(!k)
899 {
900 if(numbytes > 17 && (!strncmp(buf, "HTTP/1.1 200 OK\r\n", 17)
901 || !strncmp(buf, "HTTP/1.0 200 OK\r\n", 17)))
902 {
903 const char *datacheck = "Content-Type: gnss/data\r\n";
904 const char *chunkycheck = "Transfer-Encoding: chunked\r\n";
905 int l = strlen(datacheck)-1;
906 int j=0;
907 for(i = 0; j != l && i < numbytes-l; ++i)
908 {
909 for(j = 0; j < l && buf[i+j] == datacheck[j]; ++j)
910 ;
911 }
912 if(i == numbytes-l)
913 {
914 fprintf(stderr, "No 'Content-Type: gnss/data' found\n");
915 exit(1);
916 }
917 l = strlen(chunkycheck)-1;
918 j=0;
919 for(i = 0; j != l && i < numbytes-l; ++i)
920 {
921 for(j = 0; j < l && buf[i+j] == chunkycheck[j]; ++j)
922 ;
923 }
924 if(i < numbytes-l)
925 chunkymode = 1;
926 }
927 else if(numbytes < 12 || strncmp("ICY 200 OK\r\n", buf, 12))
928 {
929 fprintf(stderr, "Could not get the requested data: ");
930 for(k = 0; k < numbytes && buf[k] != '\n' && buf[k] != '\r'; ++k)
931 {
932 fprintf(stderr, "%c", isprint(buf[k]) ? buf[k] : '.');
933 }
934 fprintf(stderr, "\n");
935 exit(1);
936 }
937 else if(args.mode != NTRIP1)
938 {
939 fprintf(stderr, "NTRIP version 2 HTTP connection failed%s.\n",
940 args.mode == AUTO ? ", falling back to NTRIP1" : "");
941 if(args.mode == HTTP)
942 exit(1);
943 }
944 ++k;
945 }
946 else
947 {
948 sleeptime = 0;
949 if(chunkymode)
950 {
951 int stop = 0;
952 int pos = 0;
953 while(!stop && pos < numbytes)
954 {
955 switch(chunkymode)
956 {
957 case 1: /* reading number starts */
958 chunksize = 0;
959 ++chunkymode; /* no break */
960 case 2: /* during reading number */
961 i = buf[pos++];
962 if(i >= '0' && i <= '9') chunksize = chunksize*16+i-'0';
963 else if(i >= 'a' && i <= 'f') chunksize = chunksize*16+i-'a'+10;
964 else if(i >= 'A' && i <= 'F') chunksize = chunksize*16+i-'A'+10;
965 else if(i == '\r') ++chunkymode;
966 else stop = 1;
967 break;
968 case 3: /* scanning for return */
969 if(buf[pos++] == '\n') chunkymode = chunksize ? 4 : 1;
970 else stop = 1;
971 break;
972 case 4: /* output data */
973 i = numbytes-pos;
974 if(i > chunksize) i = chunksize;
975 fwrite(buf+pos, (size_t)i, 1, stdout);
976 totalbytes += i;
977 chunksize -= i;
978 pos += i;
979 if(!chunksize)
980 chunkymode = 1;
981 break;
982 }
983 }
984 if(stop)
985 {
986 fprintf(stderr, "Error in chunky transfer encoding\n");
987 break;
988 }
989 }
990 else
991 {
992 totalbytes += numbytes;
993 fwrite(buf, (size_t)numbytes, 1, stdout);
994 }
995 fflush(stdout);
996 if(totalbytes < 0) /* overflow */
997 {
998 totalbytes = 0;
999 starttime = time(0);
1000 lastout = starttime;
1001 }
1002 if(args.bitrate)
1003 {
1004 int t = time(0);
1005 if(t > lastout + 60)
1006 {
1007 lastout = t;
1008 fprintf(stderr, "Bitrate is %dbyte/s (%d seconds accumulated).\n",
1009 totalbytes/(t-starttime), t-starttime);
1010 }
1011 }
1012 }
1013 }
1014 }
1015 else
1016 {
1017 sleeptime = 0;
1018 while(!stop && (numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) > 0)
1019 {
1020#ifndef WINDOWSVERSION
1021 alarm(ALARMTIME);
1022#endif
1023 fwrite(buf, (size_t)numbytes, 1, stdout);
1024 }
1025 }
1026 closesocket(sockfd);
1027 }
1028 } while(args.data && *args.data != '%' && !stop);
1029 }
1030 return 0;
1031}
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