/*
Easy example NTRIP client for POSIX.
$Id: ntripclient.c,v 1.33 2007/10/05 15:40:24 stuerze Exp $
Copyright (C) 2003-2005 by Dirk Stoecker <soft@dstoecker.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
or read http://www.gnu.org/licenses/gpl.txt
*/
#include <ctype.h>
#include <getopt.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <time.h>
#ifndef COMPILEDATE
#define COMPILEDATE " built " __DATE__
#endif
/* The string, which is send as agent in HTTP request */
#define AGENTSTRING "NTRIP NtripClientPOSIX"
#define MAXDATASIZE 1000 /* max number of bytes we can get at once */
#define ALARMTIME (2*60)
/* CVS revision and version */
static char revisionstr[] = "$Revision: 1.33 $";
static char datestr[] = "$Date: 2007/10/05 15:40:24 $";
enum MODE { HTTP = 1, RTSP = 2, NTRIP1 = 3, AUTO = 4, END };
struct Args
{
const char *server;
const char *port;
const char *user;
const char *proxyhost;
const char *proxyport;
const char *password;
const char *nmea;
const char *data;
int bitrate;
int mode;
};
/* option parsing */
#ifdef NO_LONG_OPTS
#define LONG_OPT(a)
#else
#define LONG_OPT(a) a
static struct option opts[] = {
{ "bitrate", no_argument, 0, 'b'},
{ "data", required_argument, 0, 'd'},
{ "server", required_argument, 0, 's'},
{ "password", required_argument, 0, 'p'},
{ "port", required_argument, 0, 'r'},
{ "proxyport", required_argument, 0, 'R'},
{ "proxyhost", required_argument, 0, 'S'},
{ "user", required_argument, 0, 'u'},
{ "nmea", required_argument, 0, 'n'},
{ "mode", required_argument, 0, 'M'},
{ "help", no_argument, 0, 'h'},
{0,0,0,0}};
#endif
#define ARGOPT "-d:bhp:r:s:u:n:S:R:M:"
#ifdef __GNUC__
static __attribute__ ((noreturn)) void sighandler_alarm(
int sig __attribute__((__unused__)))
#else /* __GNUC__ */
static void sighandler_alarm(int sig)
#endif /* __GNUC__ */
{
fprintf(stderr, "ERROR: more than %d seconds no activity\n", ALARMTIME);
exit(1);
}
int stop = 0;
#ifdef __GNUC__
static void sighandler_int(int sig __attribute__((__unused__)))
#else /* __GNUC__ */
static void sighandler_alarm(int sig)
#endif /* __GNUC__ */
{
alarm(2);
stop = 1;
}
static const char *encodeurl(const char *req)
{
char *h = "0123456789abcdef";
static char buf[128];
char *urlenc = buf;
char *bufend = buf + sizeof(buf) - 3;
while(*req && urlenc < bufend)
{
if(isalnum(*req)
|| *req == '-' || *req == '_' || *req == '.')
*urlenc++ = *req++;
else
{
*urlenc++ = '%';
*urlenc++ = h[*req >> 4];
*urlenc++ = h[*req & 0x0f];
*req++;
}
}
*urlenc = 0;
return buf;
}
static const char *geturl(const char *url, struct Args *args)
{
static char buf[1000];
static char *Buffer = buf;
static char *Bufend = buf+sizeof(buf);
char *h = "0123456789abcdef";
if(strncmp("ntrip:", url, 6))
return "URL must start with 'ntrip:'.";
url += 6; /* skip ntrip: */
if(*url != '@' && *url != '/')
{
/* scan for mountpoint */
args->data = Buffer;
if(*url != '?')
{
while(*url && *url != '@' && *url != ';' && *url != '/' && Buffer != Bufend)
*(Buffer++) = *(url++);
}
else
{
while(*url && *url != '@' && *url != '/' && Buffer != Bufend)
{
if(isalnum(*url) || *url == '-' || *url == '_' || *url == '.')
*Buffer++ = *url++;
else
{
*Buffer++ = '%';
*Buffer++ = h[*url >> 4];
*Buffer++ = h[*url & 0x0f];
*url++;
}
}
}
if(Buffer == args->data)
return "Mountpoint required.";
else if(Buffer >= Bufend-1)
return "Parsing buffer too short.";
*(Buffer++) = 0;
}
if(*url == '/') /* username and password */
{
++url;
args->user = Buffer;
while(*url && *url != '@' && *url != ';' && *url != ':' && Buffer != Bufend)
*(Buffer++) = *(url++);
if(Buffer == args->user)
return "Username cannot be empty.";
else if(Buffer >= Bufend-1)
return "Parsing buffer too short.";
*(Buffer++) = 0;
if(*url == ':') ++url;
args->password = Buffer;
while(*url && *url != '@' && *url != ';' && Buffer != Bufend)
*(Buffer++) = *(url++);
if(Buffer == args->password)
return "Password cannot be empty.";
else if(Buffer >= Bufend-1)
return "Parsing buffer too short.";
*(Buffer++) = 0;
}
if(*url == '@') /* server */
{
++url;
if(*url != '@' && *url != ':')
{
args->server = Buffer;
while(*url && *url != '@' && *url != ':' && *url != ';' && Buffer != Bufend)
*(Buffer++) = *(url++);
if(Buffer == args->server)
return "Servername cannot be empty.";
else if(Buffer >= Bufend-1)
return "Parsing buffer too short.";
*(Buffer++) = 0;
}
if(*url == ':')
{
++url;
args->port = Buffer;
while(*url && *url != '@' && *url != ';' && Buffer != Bufend)
*(Buffer++) = *(url++);
if(Buffer == args->port)
return "Port cannot be empty.";
else if(Buffer >= Bufend-1)
return "Parsing buffer too short.";
*(Buffer++) = 0;
}
if(*url == '@') /* proxy */
{
++url;
args->proxyhost = Buffer;
while(*url && *url != ':' && *url != ';' && Buffer != Bufend)
*(Buffer++) = *(url++);
if(Buffer == args->proxyhost)
return "Proxy servername cannot be empty.";
else if(Buffer >= Bufend-1)
return "Parsing buffer too short.";
*(Buffer++) = 0;
if(*url == ':')
{
++url;
args->proxyport = Buffer;
while(*url && *url != ';' && Buffer != Bufend)
*(Buffer++) = *(url++);
if(Buffer == args->proxyport)
return "Proxy port cannot be empty.";
else if(Buffer >= Bufend-1)
return "Parsing buffer too short.";
*(Buffer++) = 0;
}
}
}
if(*url == ';') /* NMEA */
{
args->nmea = ++url;
while(*url)
++url;
}
return *url ? "Garbage at end of server string." : 0;
}
static int getargs(int argc, char **argv, struct Args *args)
{
int res = 1;
int getoptr;
char *a;
int i = 0, help = 0;
args->server = "www.euref-ip.net";
args->port = "2101";
args->user = "";
args->password = "";
args->nmea = 0;
args->data = 0;
args->bitrate = 0;
args->proxyhost = 0;
args->proxyport = "2101";
args->mode = AUTO;
help = 0;
do
{
#ifdef NO_LONG_OPTS
switch((getoptr = getopt(argc, argv, ARGOPT)))
#else
switch((getoptr = getopt_long(argc, argv, ARGOPT, opts, 0)))
#endif
{
case 's': args->server = optarg; break;
case 'u': args->user = optarg; break;
case 'p': args->password = optarg; break;
case 'd':
if(optarg && *optarg == '?')
args->data = encodeurl(optarg);
else
args->data = optarg;
break;
case 'n': args->nmea = optarg; break;
case 'b': args->bitrate = 1; break;
case 'h': help=1; break;
case 'r': args->port = optarg; break;
case 'S': args->proxyhost = optarg; break;
case 'R': args->proxyport = optarg; break;
case 'M':
args->mode = 0;
if (!strcmp(optarg,"n") || !strcmp(optarg,"ntrip1"))
args->mode = NTRIP1;
else if(!strcmp(optarg,"h") || !strcmp(optarg,"http"))
args->mode = HTTP;
else if(!strcmp(optarg,"r") || !strcmp(optarg,"rtsp"))
args->mode = RTSP;
else if(!strcmp(optarg,"a") || !strcmp(optarg,"auto"))
args->mode = AUTO;
else args->mode = atoi(optarg);
if((args->mode == 0) || (args->mode >= END))
{
fprintf(stderr, "Mode %s unknown\n", optarg);
res = 0;
}
break;
case 1:
{
const char *err;
if((err = geturl(optarg, args)))
{
fprintf(stderr, "%s\n\n", err);
res = 0;
}
}
break;
case -1: break;
}
} while(getoptr != -1 && res);
for(a = revisionstr+11; *a && *a != ' '; ++a)
revisionstr[i++] = *a;
revisionstr[i] = 0;
datestr[0] = datestr[7];
datestr[1] = datestr[8];
datestr[2] = datestr[9];
datestr[3] = datestr[10];
datestr[5] = datestr[12];
datestr[6] = datestr[13];
datestr[8] = datestr[15];
datestr[9] = datestr[16];
datestr[4] = datestr[7] = '-';
datestr[10] = 0;
if(!res || help)
{
fprintf(stderr, "Version %s (%s) GPL" COMPILEDATE "\nUsage:\n%s -s server -u user ...\n"
" -d " LONG_OPT("--data ") "the requested data set\n"
" -s " LONG_OPT("--server ") "the server name or address\n"
" -p " LONG_OPT("--password ") "the login password\n"
" -r " LONG_OPT("--port ") "the server port number (default 2101)\n"
" -u " LONG_OPT("--user ") "the user name\n"
" -n " LONG_OPT("--nmea ") "NMEA string for sending to server\n"
" -b " LONG_OPT("--bitrate ") "output bitrate\n"
" -S " LONG_OPT("--proxyhost ") "proxy name or address\n"
" -R " LONG_OPT("--proxyport ") "proxy port, optional (default 2101)\n"
" -M " LONG_OPT("--mode ") "mode for data request\n"
" Valid modes are:\n"
" 1, h, http NTRIP Version 2.0 Caster in TCP/IP mode\n"
" 2, r, rtsp NTRIP Version 2.0 Caster in RTSP/RTP mode\n"
" 3, n, ntrip1 NTRIP Version 1.0 Caster\n"
" 4, a, auto automatic detection (default)\n"
"or using an URL:\n%s ntrip:data[/user[:password]][@[server][:port][@proxyhost[:proxyport]]][;nmea]\n"
, revisionstr, datestr, argv[0], argv[0]);
exit(1);
}
return res;
}
static const char encodingTable [64] = {
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/'
};
/* does not buffer overrun, but breaks directly after an error */
/* returns the number of required bytes */
static int encode(char *buf, int size, const char *user, const char *pwd)
{
unsigned char inbuf[3];
char *out = buf;
int i, sep = 0, fill = 0, bytes = 0;
while(*user || *pwd)
{
i = 0;
while(i < 3 && *user) inbuf[i++] = *(user++);
if(i < 3 && !sep) {inbuf[i++] = ':'; ++sep; }
while(i < 3 && *pwd) inbuf[i++] = *(pwd++);
while(i < 3) {inbuf[i++] = 0; ++fill; }
if(out-buf < size-1)
*(out++) = encodingTable[(inbuf [0] & 0xFC) >> 2];
if(out-buf < size-1)
*(out++) = encodingTable[((inbuf [0] & 0x03) << 4)
| ((inbuf [1] & 0xF0) >> 4)];
if(out-buf < size-1)
{
if(fill == 2)
*(out++) = '=';
else
*(out++) = encodingTable[((inbuf [1] & 0x0F) << 2)
| ((inbuf [2] & 0xC0) >> 6)];
}
if(out-buf < size-1)
{
if(fill >= 1)
*(out++) = '=';
else
*(out++) = encodingTable[inbuf [2] & 0x3F];
}
bytes += 4;
}
if(out-buf < size)
*out = 0;
return bytes;
}
int main(int argc, char **argv)
{
struct Args args;
setbuf(stdout, 0);
setbuf(stdin, 0);
setbuf(stderr, 0);
signal(SIGALRM,sighandler_alarm);
signal(SIGINT,sighandler_int);
alarm(ALARMTIME);
if(getargs(argc, argv, &args))
{
int sleeptime = 0;
do
{
int sockfd, numbytes;
char buf[MAXDATASIZE];
struct sockaddr_in their_addr; /* connector's address information */
struct hostent *he;
struct servent *se;
const char *server, *port, *proxyserver = 0;
char proxyport[6];
char *b;
long i;
if(sleeptime)
{
sleep(sleeptime);
sleeptime += 2;
}
else
{
sleeptime = 1;
}
alarm(ALARMTIME);
if(args.proxyhost)
{
int p;
if((i = strtol(args.port, &b, 10)) && (!b || !*b))
p = i;
else if(!(se = getservbyname(args.port, 0)))
{
fprintf(stderr, "Can't resolve port %s.", args.port);
exit(1);
}
else
{
p = ntohs(se->s_port);
}
snprintf(proxyport, sizeof(proxyport), "%d", p);
port = args.proxyport;
proxyserver = args.server;
server = args.proxyhost;
}
else
{
server = args.server;
port = args.port;
}
memset(&their_addr, 0, sizeof(struct sockaddr_in));
if((i = strtol(port, &b, 10)) && (!b || !*b))
their_addr.sin_port = htons(i);
else if(!(se = getservbyname(port, 0)))
{
fprintf(stderr, "Can't resolve port %s.", port);
exit(1);
}
else
{
their_addr.sin_port = se->s_port;
}
if(!(he=gethostbyname(server)))
{
fprintf(stderr, "Server name lookup failed for '%s'.\n", server);
exit(1);
}
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
perror("socket");
exit(1);
}
their_addr.sin_family = AF_INET;
their_addr.sin_addr = *((struct in_addr *)he->h_addr);
if(args.data && *args.data != '%' && args.mode == RTSP)
{
struct sockaddr_in local;
int sockudp, localport;
int cseq = 1;
socklen_t len;
if((sockudp = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
{
perror("socket");
exit(1);
}
/* fill structure with local address information for UDP */
memset(&local, 0, sizeof(local));
local.sin_family = AF_INET;
local.sin_port = htons(0);
local.sin_addr.s_addr = htonl(INADDR_ANY);
len = sizeof(local);
/* bind() in order to get a random RTP client_port */
if((bind(sockudp, (struct sockaddr *)&local, len)) < 0)
{
perror("bind");
exit(1);
}
if((getsockname(sockudp, (struct sockaddr*)&local, &len)) != -1)
{
localport = ntohs(local.sin_port);
}
else
{
perror("local access failed");
exit(1);
}
if(connect(sockfd, (struct sockaddr *)&their_addr,
sizeof(struct sockaddr)) == -1)
{
perror("connect");
exit(1);
}
i=snprintf(buf, MAXDATASIZE-40, /* leave some space for login */
"SETUP rtsp://%s%s%s/%s RTSP/1.0\r\n"
"CSeq: %d\r\n"
"Ntrip-Version: Ntrip/2.0\r\n"
"Ntrip-Component: Ntripclient\r\n"
"User-Agent: %s/%s\r\n"
"Transport: RTP/GNSS;unicast;client_port=%u\r\n"
"Authorization: Basic ",
args.server, proxyserver ? ":" : "", proxyserver ? args.port : "",
args.data, cseq++, AGENTSTRING, revisionstr, localport);
if(i > MAXDATASIZE-40 || i < 0) /* second check for old glibc */
{
fprintf(stderr, "Requested data too long\n");
exit(1);
}
i += encode(buf+i, MAXDATASIZE-i-4, args.user, args.password);
if(i > MAXDATASIZE-4)
{
fprintf(stderr, "Username and/or password too long\n");
exit(1);
}
buf[i++] = '\r';
buf[i++] = '\n';
buf[i++] = '\r';
buf[i++] = '\n';
if(args.nmea)
{
int j = snprintf(buf+i, MAXDATASIZE-i, "%s\r\n", args.nmea);
if(j >= 0 && j < MAXDATASIZE-i)
i += j;
else
{
fprintf(stderr, "NMEA string too long\n");
exit(1);
}
}
if(send(sockfd, buf, (size_t)i, 0) != i)
{
perror("send");
exit(1);
}
if((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) != -1)
{
if(numbytes >= 17 && !strncmp(buf, "RTSP/1.0 200 OK\r\n", 17))
{
int serverport = 0, session = 0;
const char *portcheck = "server_port=";
const char *sessioncheck = "session: ";
int l = strlen(portcheck)-1;
int j=0;
for(i = 0; j != l && i < numbytes-l; ++i)
{
for(j = 0; j < l && tolower(buf[i+j]) == portcheck[j]; ++j)
;
}
if(i == numbytes-l)
{
fprintf(stderr, "No server port number found\n");
exit(1);
}
else
{
i+=l;
while(i < numbytes && buf[i] >= '0' && buf[i] <= '9')
serverport = serverport * 10 + buf[i++]-'0';
if(buf[i] != '\r' && buf[i] != ';')
{
fprintf(stderr, "Could not extract server port\n");
exit(1);
}
}
l = strlen(sessioncheck)-1;
j=0;
for(i = 0; j != l && i < numbytes-l; ++i)
{
for(j = 0; j < l && tolower(buf[i+j]) == sessioncheck[j]; ++j)
;
}
if(i == numbytes-l)
{
fprintf(stderr, "No session number found\n");
exit(1);
}
else
{
i+=l;
while(i < numbytes && buf[i] >= '0' && buf[i] <= '9')
session = session * 10 + buf[i++]-'0';
if(buf[i] != '\r')
{
fprintf(stderr, "Could not extract session number\n");
exit(1);
}
}
i = snprintf(buf, MAXDATASIZE,
"PLAY rtsp://%s%s%s/%s RTSP/1.0\r\n"
"CSeq: %d\r\n"
"Session: %d\r\n"
"\r\n",
args.server, proxyserver ? ":" : "", proxyserver ? args.port : "",
args.data, cseq++, session);
if(i > MAXDATASIZE || i < 0) /* second check for old glibc */
{
fprintf(stderr, "Requested data too long\n");
exit(1);
}
if(send(sockfd, buf, (size_t)i, 0) != i)
{
perror("send");
exit(1);
}
if((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) != -1)
{
if(numbytes >= 17 && !strncmp(buf, "RTSP/1.0 200 OK\r\n", 17))
{
struct sockaddr_in addrRTP;
/* fill structure with caster address information for UDP */
memset(&addrRTP, 0, sizeof(addrRTP));
addrRTP.sin_family = AF_INET;
addrRTP.sin_port = htons(serverport);
their_addr.sin_addr = *((struct in_addr *)he->h_addr);
len = sizeof(addrRTP);
int ts = 0;
int sn = 0;
int ssrc = 0;
int init = 0;
int u, v, w;
while(!stop && (i = recvfrom(sockudp, buf, 1526, 0,
(struct sockaddr*) &addrRTP, &len)) > 0)
{
alarm(ALARMTIME);
if(i >= 12+1 && (unsigned char)buf[0] == (2 << 6) && buf[1] == 0x60)
{
u= ((unsigned char)buf[2]<<8)+(unsigned char)buf[3];
v = ((unsigned char)buf[4]<<24)+((unsigned char)buf[5]<<16)
+((unsigned char)buf[6]<<8)+(unsigned char)buf[7];
w = ((unsigned char)buf[8]<<24)+((unsigned char)buf[9]<<16)
+((unsigned char)buf[10]<<8)+(unsigned char)buf[11];
if(init)
{
if(u < -30000 && sn > 30000) sn -= 0xFFFF;
if(ssrc != w || ts > v)
{
fprintf(stderr, "Illegal UDP data received.\n");
exit(1);
}
if(u > sn) /* don't show out-of-order packets */
fwrite(buf+12, (size_t)i-12, 1, stdout);
}
sn = u; ts = v; ssrc = w; init = 1;
}
else
{
fprintf(stderr, "Illegal UDP header.\n");
exit(1);
}
}
}
i = snprintf(buf, MAXDATASIZE,
"TEARDOWN rtsp://%s%s%s/%s RTSP/1.0\r\n"
"CSeq: %d\r\n"
"Session: %d\r\n"
"\r\n",
args.server, proxyserver ? ":" : "", proxyserver ? args.port : "",
args.data, cseq++, session);
if(i > MAXDATASIZE || i < 0) /* second check for old glibc */
{
fprintf(stderr, "Requested data too long\n");
exit(1);
}
if(send(sockfd, buf, (size_t)i, 0) != i)
{
perror("send");
exit(1);
}
}
else
{
fprintf(stderr, "Could not start data stream.\n");
exit(1);
}
}
else
{
fprintf(stderr, "Could not setup initial control connection.\n");
exit(1);
}
}
else
{
perror("recv");
exit(1);
}
}
else
{
if(connect(sockfd, (struct sockaddr *)&their_addr,
sizeof(struct sockaddr)) == -1)
{
perror("connect");
exit(1);
}
if(!args.data)
{
i = snprintf(buf, MAXDATASIZE,
"GET %s%s%s%s/ HTTP/1.0\r\n"
"Host: %s\r\n%s"
"User-Agent: %s/%s\r\n"
"\r\n"
, proxyserver ? "http://" : "", proxyserver ? proxyserver : "",
proxyserver ? ":" : "", proxyserver ? proxyport : "",
args.server, args.mode == NTRIP1 ? "" : "Ntrip-Version: Ntrip/2.0\r\n",
AGENTSTRING, revisionstr);
}
else
{
i=snprintf(buf, MAXDATASIZE-40, /* leave some space for login */
"GET %s%s%s%s/%s HTTP/1.0\r\n"
"Host: %s\r\n%s"
"User-Agent: %s/%s\r\n"
"Authorization: Basic "
, proxyserver ? "http://" : "", proxyserver ? proxyserver : "",
proxyserver ? ":" : "", proxyserver ? proxyport : "",
args.data, args.server,
args.mode == NTRIP1 ? "" : "Ntrip-Version: Ntrip/2.0\r\n",
AGENTSTRING, revisionstr);
if(i > MAXDATASIZE-40 || i < 0) /* second check for old glibc */
{
fprintf(stderr, "Requested data too long\n");
exit(1);
}
i += encode(buf+i, MAXDATASIZE-i-4, args.user, args.password);
if(i > MAXDATASIZE-4)
{
fprintf(stderr, "Username and/or password too long\n");
exit(1);
}
buf[i++] = '\r';
buf[i++] = '\n';
buf[i++] = '\r';
buf[i++] = '\n';
if(args.nmea)
{
int j = snprintf(buf+i, MAXDATASIZE-i, "%s\r\n", args.nmea);
if(j >= 0 && j < MAXDATASIZE-i)
i += j;
else
{
fprintf(stderr, "NMEA string too long\n");
exit(1);
}
}
}
if(send(sockfd, buf, (size_t)i, 0) != i)
{
perror("send");
exit(1);
}
if(args.data && *args.data != '%')
{
int k = 0;
int chunkymode = 0;
int starttime = time(0);
int lastout = starttime;
int totalbytes = 0;
int chunksize = 0;
while(!stop && (numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) != -1)
{
alarm(ALARMTIME);
if(!k)
{
if(numbytes > 17 && (!strncmp(buf, "HTTP/1.1 200 OK\r\n", 17)
|| !strncmp(buf, "HTTP/1.0 200 OK\r\n", 17)))
{
const char *datacheck = "Content-Type: gnss/data\r\n";
const char *chunkycheck = "Transfer-Encoding: chunked\r\n";
int l = strlen(datacheck)-1;
int j=0;
for(i = 0; j != l && i < numbytes-l; ++i)
{
for(j = 0; j < l && buf[i+j] == datacheck[j]; ++j)
;
}
if(i == numbytes-l)
{
fprintf(stderr, "No 'Content-Type: gnss/data' found\n");
exit(1);
}
l = strlen(chunkycheck)-1;
j=0;
for(i = 0; j != l && i < numbytes-l; ++i)
{
for(j = 0; j < l && buf[i+j] == chunkycheck[j]; ++j)
;
}
if(i < numbytes-l)
chunkymode = 1;
}
else if(numbytes < 12 || strncmp("ICY 200 OK\r\n", buf, 12))
{
fprintf(stderr, "Could not get the requested data: ");
for(k = 0; k < numbytes && buf[k] != '\n' && buf[k] != '\r'; ++k)
{
fprintf(stderr, "%c", isprint(buf[k]) ? buf[k] : '.');
}
fprintf(stderr, "\n");
exit(1);
}
else if(args.mode != NTRIP1)
{
fprintf(stderr, "NTRIP version 2 HTTP connection failed%s.\n",
args.mode == AUTO ? ", falling back to NTRIP1" : "");
if(args.mode == HTTP)
exit(1);
}
++k;
}
else
{
sleeptime = 0;
if(chunkymode)
{
int stop = 0;
int pos = 0;
while(!stop && pos < numbytes)
{
switch(chunkymode)
{
case 1: /* reading number starts */
chunksize = 0;
++chunkymode; /* no break */
case 2: /* during reading number */
i = buf[pos++];
if(i >= '0' && i <= '9') chunksize = chunksize*16+i-'0';
else if(i >= 'a' && i <= 'f') chunksize = chunksize*16+i-'a'+10;
else if(i >= 'A' && i <= 'F') chunksize = chunksize*16+i-'A'+10;
else if(i == '\r') ++chunkymode;
else stop = 1;
break;
case 3: /* scanning for return */
if(buf[pos++] == '\n') chunkymode = chunksize ? 4 : 1;
else stop = 1;
break;
case 4: /* output data */
i = numbytes-pos;
if(i > chunksize) i = chunksize;
fwrite(buf+pos, (size_t)i, 1, stdout);
totalbytes += i;
chunksize -= i;
pos += i;
if(!chunksize)
chunkymode = 1;
break;
}
}
if(stop)
{
fprintf(stderr, "Error in chunky transfer encoding\n");
break;
}
}
else
{
totalbytes += numbytes;
fwrite(buf, (size_t)numbytes, 1, stdout);
}
fflush(stdout);
if(totalbytes < 0) /* overflow */
{
totalbytes = 0;
starttime = time(0);
lastout = starttime;
}
if(args.bitrate)
{
int t = time(0);
if(t > lastout + 60)
{
lastout = t;
fprintf(stderr, "Bitrate is %dbyte/s (%d seconds accumulated).\n",
totalbytes/(t-starttime), t-starttime);
}
}
}
}
}
else
{
sleeptime = 0;
while(!stop && (numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) > 0)
{
alarm(ALARMTIME);
fwrite(buf, (size_t)numbytes, 1, stdout);
}
}
close(sockfd);
}
} while(args.data && *args.data != '%' && !stop);
}
return 0;
}