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ntripthread.cpp
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ntripthread.cpp
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/*
Original implementation: NTRIP client for POSIX.
$Id: ntripclient.c,v 1.51 2009/09/11 09:49:19 stoecker Exp $
Copyright (C) 2003-2008 by Dirk Stöcker <soft@dstoecker.de>
ntripthread.cpp (modifications for GNSS-Stylus)
Copyright (C) 2019-2021 Pasi Nuutinmaki (gnssstylist<at>sci<dot>fi)
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 3 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, see <https://www.gnu.org/licenses/>.
*/
/*
* This NTRIP-client-implementation is based on the "NTRIP client for POSIX" by Dirk Stöcker.
* Modifications were mostly encapsulating it to a c++ class, removing of the serial interface
* and replacing it with QT's signal-based mechanism and overriding the output functions
* (printf, fprintf, fwrite). Also some statics were moved into the class to make the
* thread restartable.
*
* Not too pretty but works...
*
* Note: Does not work with u-center (version 19.06) if authentication is in use.
* Authentication works with SNIP.
*/
#ifdef _WIN32
#define WINDOWSVERSION
#endif
#include "ntripthread.h"
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <stdarg.h>
#include <memory>
#ifdef WINDOWSVERSION
#include <winsock.h>
typedef SOCKET sockettype;
typedef u_long in_addr_t;
typedef int socklen_t;
#else
typedef int sockettype;
#include <signal.h>
#include <fcntl.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#define closesocket(sock) close(sock)
#define ALARMTIME (2*60)
#endif
//#ifndef COMPILEDATE
//#define COMPILEDATE " built " __DATE__
//#endif
/* The string, which is send as agent in HTTP request */
#define AGENTSTRING "NTRIP GNSS-Stylus"
#define TIME_RESOLUTION 125
#define MAXDATASIZE 1000 /* max number of bytes we can get at once */
#pragma GCC diagnostic push
//#pragma GCC diagnostic ignored "-Wdate-time" // "expansion of date or time macro is not reproducible" "note: expanded from macro 'COMPILEDATE'"
#pragma GCC diagnostic ignored "-Wold-style-cast"
#pragma GCC diagnostic ignored "-Wsign-conversion" // "implicit conversion changes signedness: 'int' to 'char'"
#pragma GCC diagnostic ignored "-Wimplicit-fallthrough" // "this statement may fall through"
//#pragma GCC diagnostic ignored "-Wconditional-uninitialized" // "variable 'p' may be uninitialized when used here"
#pragma GCC diagnostic ignored "-Wconversion" // "implicit conversion loses integer precision: 'long' to 'u_short' (aka 'unsigned short')"
#pragma GCC diagnostic ignored "-Wsign-compare" // "comparison of integers of different signs: 'sockettype' (aka 'unsigned int') and 'int'"
#pragma GCC diagnostic ignored "-Wcast-align" // "cast from 'char *' to 'struct in_addr *' increases required alignment from 1 to 4"
//#pragma GCC diagnostic ignored "-Wpointer-sign" // "passing 'socklen_t *' (aka 'unsigned int *') to parameter of type 'int *' converts between pointers to integer types with different sign" "winsock.h:283:82: note: passing argument to parameter 'namelen' here"
#pragma GCC diagnostic ignored "-Wzero-as-null-pointer-constant"
/* Version (/revision) */
/* TODO: Get rid of hard-coded version */
static const char revisionstr[] = "1.0.0";
//static const char datestr[] = "2019/08/21";
/* option parsing */
#ifdef NO_LONG_OPTS
#define LONG_OPT(a)
#else
#define LONG_OPT(a) a
static const struct option optsInit[] = {
{ "bitrate", no_argument, nullptr, 'b'},
//{ "data", required_argument, nullptr, 'd'}, /* compatibility */
{ "mountpoint", required_argument, nullptr, 'm'},
{ "initudp", no_argument, nullptr, 'I'},
{ "udpport", required_argument, nullptr, 'P'},
{ "server", required_argument, nullptr, 's'},
{ "password", required_argument, nullptr, 'p'},
{ "port", required_argument, nullptr, 'r'},
{ "proxyport", required_argument, nullptr, 'R'},
{ "proxyhost", required_argument, nullptr, 'S'},
{ "user", required_argument, nullptr, 'u'},
{ "nmea", required_argument, nullptr, 'n'},
{ "mode", required_argument, nullptr, 'M'},
{ "serlogfile", required_argument, nullptr, 'l'},
{ "help", no_argument, nullptr, 'h'},
{nullptr,0,nullptr,0}};
#endif
#define ARGOPT "m:bhp:r:s:u:n:S:R:M:IP:l:"
//Original: #define ARGOPT "-d:m:bhp:r:s:u:n:S:R:M:IP:D:B:T:C:Y:A:l:"
const char *NTRIPThread::encodeurl(const char *req)
{
const char *h = "0123456789abcdef";
char *urlenc = encodeUrlBuffer;
char *bufend = encodeUrlBuffer + sizeof(encodeUrlBuffer) - 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 encodeUrlBuffer;
}
const char *NTRIPThread::geturl(const char *url, struct Args *args)
{
const char *h = "0123456789abcdef";
getUrlBufferPtr = getUrlBuffer;
getUrlBufferEndPtr = getUrlBuffer+sizeof(getUrlBuffer);
if(strncmp("ntrip:", url, 6))
return "URL must start with 'ntrip:'.";
url += 6; /* skip ntrip: */
if(*url != '@' && *url != '/')
{
/* scan for mountpoint */
args->data = getUrlBufferPtr;
if(*url != '?')
{
while(*url && *url != '@' && *url != ';' && *url != '/' && getUrlBufferPtr != getUrlBufferEndPtr)
*(getUrlBufferPtr++) = *(url++);
}
else
{
while(*url && *url != '@' && *url != '/' && getUrlBufferPtr != getUrlBufferEndPtr)
{
if(isalnum(*url) || *url == '-' || *url == '_' || *url == '.')
*getUrlBufferPtr++ = *url++;
else
{
*getUrlBufferPtr++ = '%';
*getUrlBufferPtr++ = h[*url >> 4];
*getUrlBufferPtr++ = h[*url & 0x0f];
url++;
}
}
}
if(getUrlBufferPtr == args->data)
return "Mountpoint required.";
else if(getUrlBufferPtr >= getUrlBufferEndPtr-1)
return "Parsing buffer too short.";
*(getUrlBufferPtr++) = 0;
}
if(*url == '/') /* username and password */
{
++url;
args->user = getUrlBufferPtr;
while(*url && *url != '@' && *url != ';' && *url != ':' && getUrlBufferPtr != getUrlBufferEndPtr)
*(getUrlBufferPtr++) = *(url++);
if(getUrlBufferPtr == args->user)
return "Username cannot be empty.";
else if(getUrlBufferPtr >= getUrlBufferEndPtr-1)
return "Parsing buffer too short.";
*(getUrlBufferPtr++) = 0;
if(*url == ':') ++url;
args->password = getUrlBufferPtr;
while(*url && *url != '@' && *url != ';' && getUrlBufferPtr != getUrlBufferEndPtr)
*(getUrlBufferPtr++) = *(url++);
if(getUrlBufferPtr == args->password)
return "Password cannot be empty.";
else if(getUrlBufferPtr >= getUrlBufferEndPtr-1)
return "Parsing buffer too short.";
*(getUrlBufferPtr++) = 0;
}
if(*url == '@') /* server */
{
++url;
if(*url != '@' && *url != ':')
{
args->server = getUrlBufferPtr;
while(*url && *url != '@' && *url != ':' && *url != ';' && getUrlBufferPtr != getUrlBufferEndPtr)
*(getUrlBufferPtr++) = *(url++);
if(getUrlBufferPtr == args->server)
return "Servername cannot be empty.";
else if(getUrlBufferPtr >= getUrlBufferEndPtr-1)
return "Parsing buffer too short.";
*(getUrlBufferPtr++) = 0;
}
if(*url == ':')
{
++url;
args->port = getUrlBufferPtr;
while(*url && *url != '@' && *url != ';' && getUrlBufferPtr != getUrlBufferEndPtr)
*(getUrlBufferPtr++) = *(url++);
if(getUrlBufferPtr == args->port)
return "Port cannot be empty.";
else if(getUrlBufferPtr >= getUrlBufferEndPtr-1)
return "Parsing buffer too short.";
*(getUrlBufferPtr++) = 0;
}
if(*url == '@') /* proxy */
{
++url;
args->proxyhost = getUrlBufferPtr;
while(*url && *url != ':' && *url != ';' && getUrlBufferPtr != getUrlBufferEndPtr)
*(getUrlBufferPtr++) = *(url++);
if(getUrlBufferPtr == args->proxyhost)
return "Proxy servername cannot be empty.";
else if(getUrlBufferPtr >= getUrlBufferEndPtr-1)
return "Parsing buffer too short.";
*(getUrlBufferPtr++) = 0;
if(*url == ':')
{
++url;
args->proxyport = getUrlBufferPtr;
while(*url && *url != ';' && getUrlBufferPtr != getUrlBufferEndPtr)
*(getUrlBufferPtr++) = *(url++);
if(getUrlBufferPtr == args->proxyport)
return "Proxy port cannot be empty.";
else if(getUrlBufferPtr >= getUrlBufferEndPtr-1)
return "Parsing buffer too short.";
*(getUrlBufferPtr++) = 0;
}
}
}
if(*url == ';') /* NMEA */
{
args->nmea = ++url;
while(*url)
++url;
}
return *url ? "Garbage at end of server string." : nullptr;
}
int NTRIPThread::getargs(const int argc, const char* const* argv, struct Args* const args)
{
int res = 1;
int getoptr;
int help = 0;
args->server = "www.euref-ip.net";
args->port = "2101";
args->user = "";
args->password = "";
args->nmea = nullptr;
args->data = nullptr;
args->bitrate = 0;
args->proxyhost = nullptr;
args->proxyport = "2101";
args->mode = AUTO;
args->initudp = 0;
args->udpport = 0;
args->serlogfile = nullptr;
help = 0;
do
{
#ifdef NO_LONG_OPTS
switch((getoptr = getopt(argc, argv, ARGOPT)))
#else
switch((getoptr = getopt_long(argc, (char**)argv, ARGOPT, opts, nullptr)))
#endif
{
case 's': args->server = optarg; break;
case 'u': args->user = optarg; break;
case 'p': args->password = optarg; break;
case 'm':
if(optarg && *optarg == '?')
args->data = encodeurl(optarg);
else
args->data = optarg;
break;
case 'l': args->serlogfile = optarg; break;
case 'I': args->initudp = 1; break;
case 'P': args->udpport = strtol(optarg, nullptr, 10); 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 (optarg)
{
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,"u") || !strcmp(optarg,"udp"))
args->mode = UDP;
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);
if(!res || help)
{
printf("Usage:\n-s server -u user ...\n"
" -m " LONG_OPT("--mountpoint ") "the requested data set or sourcetable filtering criteria\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"
" -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"
" 5, u, udp NTRIP Version 2.0 Caster in UDP mode\n"
"or using an URL:\nntrip:mountpoint[/user[:password]][@[server][:port][@proxyhost[:proxyport]]][;nmea]\n"
"\nExpert options:\n"
" -n " LONG_OPT("--nmea ") "NMEA string for sending to server\n"
" -b " LONG_OPT("--bitrate ") "output bitrate\n"
" -I " LONG_OPT("--initudp ") "send initial UDP packet for firewall handling\n"
" -P " LONG_OPT("--udpport ") "set the local UDP port\n"
" -S " LONG_OPT("--proxyhost ") "proxy name or address\n"
" -R " LONG_OPT("--proxyport ") "proxy port, optional (default 2101)\n"
);
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 */
int NTRIPThread::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++] = static_cast<unsigned char>(*(user++));
if(i < 3 && !sep) {inbuf[i++] = ':'; ++sep; }
while(i < 3 && *pwd) inbuf[i++] = static_cast<unsigned char>(*(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 globalError; // This is just to get rid of some nags from static analyzer
// (Static analyzer likes to nag about error-variable being set but not used. Store it here to get rid of those).
int NTRIPThread::main(const int argc, const char* const* const argv)
{
struct Args args;
setbuf(stdout, nullptr);
setbuf(stdin, nullptr);
setbuf(stderr, nullptr);
#ifndef WINDOWSVERSION
// signal(SIGALRM,sighandler_alarm);
// signal(SIGINT,sighandler_int);
// alarm(ALARMTIME);
#else
WSADATA wsaData;
if(WSAStartup(MAKEWORD(1,1),&wsaData))
{
fprintf(stderr, "Could not init network access.\n");
return 20;
}
#endif
if(getargs(argc, argv, &args))
{
FILE *ser = nullptr;
int sleeptime = 0;
if(args.serlogfile)
{
if(!(ser = fopen(args.serlogfile, "a+")))
{
fprintf(stderr, "Could not open serial logfile.\n");
return 20;
}
}
do
{
int error = 0;
sockettype sockfd = 0;
int numbytes;
char buf[MAXDATASIZE];
struct sockaddr_in their_addr; /* connector's address information */
struct hostent *he = nullptr;
struct servent *se;
const char *server, *port, *proxyserver = nullptr;
char proxyport[6];
char *b;
long i = 0;
if(sleeptime)
{
#ifdef WINDOWSVERSION
Sleep(static_cast<DWORD>(sleeptime*1000));
#else
sleep(sleeptime);
#endif
sleeptime += 2;
}
else
{
sleeptime = 1;
}
#ifndef WINDOWSVERSION
alarm(ALARMTIME);
#endif
if(args.proxyhost)
{
int p = 0;
if((i = strtol(args.port, &b, 10)) && (!b || !*b))
p = i;
else if(!(se = getservbyname(args.port, nullptr)))
{
fprintf(stderr, "Can't resolve port %s.", args.port);
stop = 1;
}
else
{
p = ntohs(static_cast<u_short>(se->s_port));
}
if(!stop && !error)
{
snprintf(proxyport, sizeof(proxyport), "%d", p);
port = args.proxyport;
proxyserver = args.server;
server = args.proxyhost;
}
}
else
{
server = args.server;
port = args.port;
}
if(!stop && !error)
{
memset(&their_addr, 0, sizeof(struct sockaddr_in));
if((i = strtol(port, &b, 10)) && (!b || !*b))
their_addr.sin_port = static_cast<u_short>(htons(i));
else if(!(se = getservbyname(port, nullptr)))
{
fprintf(stderr, "Can't resolve port %s.", port);
stop = 1;
}
else
{
their_addr.sin_port = static_cast<u_short>(se->s_port);
}
if(!stop && !error)
{
if(!(he=gethostbyname(server)))
{
fprintf(stderr, "Server name lookup failed for '%s'.\n", server);
error = 1;
}
else if((sockfd = socket(AF_INET, (args.mode == static_cast<int>(UDP) ? SOCK_DGRAM :
SOCK_STREAM), 0)) == -1)
{
myperror("socket");
error = 1;
}
else
{
their_addr.sin_family = AF_INET;
their_addr.sin_addr = *((struct in_addr *)he->h_addr);
}
}
}
if(!stop && !error)
{
if(args.mode == UDP)
{
unsigned int session;
int tim, seq, init;
char rtpbuf[1526];
int i=12, j;
init = time(0);
srand(init);
session = rand();
tim = rand();
seq = rand();
rtpbuf[0] = (2<<6);
/* padding, extension, csrc are empty */
rtpbuf[1] = 97;
/* marker is empty */
rtpbuf[2] = (seq>>8)&0xFF;
rtpbuf[3] = (seq)&0xFF;
rtpbuf[4] = (tim>>24)&0xFF;
rtpbuf[5] = (tim>>16)&0xFF;
rtpbuf[6] = (tim>>8)&0xFF;
rtpbuf[7] = (tim)&0xFF;
/* sequence and timestamp are empty */
rtpbuf[8] = (session>>24)&0xFF;
rtpbuf[9] = (session>>16)&0xFF;
rtpbuf[10] = (session>>8)&0xFF;
rtpbuf[11] = (session)&0xFF;
++seq;
j = snprintf(rtpbuf+i, sizeof(rtpbuf)-i-40, /* leave some space for login */
"GET /%s HTTP/1.1\r\n"
"Host: %s\r\n"
"Ntrip-Version: Ntrip/2.0\r\n"
"User-Agent: %s/%s\r\n"
"%s%s%s"
"Connection: close%s",
args.data ? args.data : "", args.server, AGENTSTRING, revisionstr,
args.nmea ? "Ntrip-GGA: " : "", args.nmea ? args.nmea : "",
args.nmea ? "\r\n" : "",
(*args.user || *args.password) ? "\r\nAuthorization: Basic " : "");
i += j;
if(i > (int)sizeof(rtpbuf)-40 || j < 0) /* second check for old glibc */
{
fprintf(stderr, "Requested data too long\n");
stop = 1;
}
else
{
i += encode(rtpbuf+i, sizeof(rtpbuf)-i-4, args.user, args.password);
if(i > (int)sizeof(rtpbuf)-4)
{
fprintf(stderr, "Username and/or password too long\n");
stop = 1;
}
else
{
struct sockaddr_in local;
socklen_t len;
rtpbuf[i++] = '\r';
rtpbuf[i++] = '\n';
rtpbuf[i++] = '\r';
rtpbuf[i++] = '\n';
/* fill structure with local address information for UDP */
memset(&local, 0, sizeof(local));
local.sin_family = AF_INET;
local.sin_port = htons(args.udpport);
local.sin_addr.s_addr = htonl(INADDR_ANY);
len = sizeof(local);
/* bind() in order to get a random RTP client_port */
if((bind(sockfd, (struct sockaddr *)&local, len)) < 0)
{
myperror("bind");
error = 1;
}
else if(::connect(sockfd, (struct sockaddr *)&their_addr,
sizeof(struct sockaddr)) == -1)
{
myperror("connect");
error = 1;
}
else if(send(sockfd, rtpbuf, i, 0) != i)
{
myperror("Could not send UDP packet");
stop = 1;
}
else
{
if((numbytes=recv(sockfd, rtpbuf, sizeof(rtpbuf)-1, 0)) > 0)
{
int sn = 0x10000, ts=0;
/* we don't expect message longer than 1513, so we cut the last
byte for security reasons to prevent buffer overrun */
rtpbuf[numbytes] = 0;
if(numbytes > 17+12 &&
(!strncmp(rtpbuf+12, "HTTP/1.1 200 OK\r\n", 17) ||
!strncmp(rtpbuf+12, "HTTP/1.0 200 OK\r\n", 17)))
{
const char *sessioncheck = "session: ";
const char *datacheck = "Content-Type: gnss/data\r\n";
const char *sourcetablecheck = "Content-Type: gnss/sourcetable\r\n";
const char *contentlengthcheck = "Content-Length: ";
const char *httpresponseend = "\r\n\r\n";
int contentlength = 0, httpresponselength = 0;
/* datacheck */
int l = strlen(datacheck)-1;
int j=0;
for(i = 12; j != l && i < numbytes-l; ++i)
{
for(j = 0; j < l && rtpbuf[i+j] == datacheck[j]; ++j)
;
}
if(i != numbytes-l)
{
/* check for Session */
l = strlen(sessioncheck)-1;
j=0;
for(i = 12; j != l && i < numbytes-l; ++i)
{
for(j = 0; j < l && tolower(rtpbuf[i+j]) == sessioncheck[j]; ++j)
;
}
if(i != numbytes-l) /* found a session number */
{
i+=l;
session = 0;
while(i < numbytes && rtpbuf[i] >= '0' && rtpbuf[i] <= '9')
session = session * 10 + rtpbuf[i++]-'0';
if(rtpbuf[i] != '\r')
{
fprintf(stderr, "Could not extract session number\n");
stop = 1;
}
}
}
else
{
/* sourcetablecheck */
l = strlen(sourcetablecheck)-1;
j=0;
for(i = 12; j != l && i < numbytes-l; ++i)
{
for(j = 0; j < l && rtpbuf[i+j] == sourcetablecheck[j]; ++j)
;
}
if(i == numbytes-l)
{
fprintf(stderr, "No 'Content-Type: gnss/data' or"
" 'Content-Type: gnss/sourcetable' found\n");
error = 1;
}
else
{
/* check for http response end */
l = strlen(httpresponseend)-1;
j=0;
for(i = 12; j != l && i < numbytes-l; ++i)
{
for(j = 0; j < l && rtpbuf[i+j] == httpresponseend[j]; ++j)
;
}
if(i != numbytes-l) /* found http response end */
{
httpresponselength = i+3-12;
}
/* check for content length */
l = strlen(contentlengthcheck)-1;
j=0;
for(i = 12; j != l && i < numbytes-l; ++i)
{
for(j = 0; j < l && rtpbuf[i+j] == contentlengthcheck[j]; ++j)
;
}
if(i != numbytes-l) /* found content length */
{
i+=l;
contentlength = 0;
while(i < numbytes && rtpbuf[i] >= '0' && rtpbuf[i] <= '9')
contentlength = contentlength * 10 + rtpbuf[i++]-'0';
if(rtpbuf[i] == '\r')
{
contentlength += httpresponselength;
do
{
fwrite(rtpbuf+12, (size_t)numbytes-12, 1, stdout);
if((contentlength -= (numbytes-12)) == 0)
{
stop = 1;
}
else
{
numbytes = recv(sockfd, rtpbuf, sizeof(rtpbuf), 0);
}
}while((numbytes >12) && (!stop));
}
else
{
fprintf(stderr, "Could not extract content length\n");
stop = 1;
}
}
}
}
}
else
{
int k;
fprintf_error_buffered("Could not get the requested data: ");
for(k = 12; k < numbytes && rtpbuf[k] != '\n' && rtpbuf[k] != '\r'; ++k)
{
fprintf_error_buffered("%c", isprint(rtpbuf[k]) ? rtpbuf[k] : '.');
}
fprintf_error_buffered_flush();
error = 1;
}
while(!stop && !error)
{
struct timeval tv = {1,0};
fd_set fdr;
fd_set fde;
FD_ZERO(&fdr);
FD_ZERO(&fde);
FD_SET(sockfd, &fdr);
FD_SET(sockfd, &fde);
if(select(sockfd+1,&fdr,0,&fde,&tv) < 0)
{
fprintf(stderr, "Select problem.\n");
error = 1;
continue;
}
i = recv(sockfd, rtpbuf, sizeof(rtpbuf), 0);
#ifndef WINDOWSVERSION
alarm(ALARMTIME);
#endif
if(i >= 12 && (unsigned char)rtpbuf[0] == (2 << 6)
&& rtpbuf[1] >= 96 && rtpbuf[1] <= 98)
{
time_t ct;
int u,v;
unsigned int w;
u = ((unsigned char)rtpbuf[2]<<8)+(unsigned char)rtpbuf[3];
v = ((unsigned char)rtpbuf[4]<<24)+((unsigned char)rtpbuf[5]<<16)
+((unsigned char)rtpbuf[6]<<8)+(unsigned char)rtpbuf[7];
w = ((unsigned char)rtpbuf[8]<<24)+((unsigned char)rtpbuf[9]<<16)
+((unsigned char)rtpbuf[10]<<8)+(unsigned char)rtpbuf[11];
if(sn == 0x10000) {sn = u-1;ts=v-1;}
else if(u < -30000 && sn > 30000) sn -= 0xFFFF;
if(session != w || ts > v)
{
fprintf(stderr, "Illegal UDP data received.\n");
continue;
}
else if(u > sn) /* don't show out-of-order packets */
{
if(rtpbuf[1] == 98)
{
fprintf(stderr, "Connection closed.\n");
error = 1;
continue;
}
else if((rtpbuf[1] == 96) && (i>12))
{
fwrite(rtpbuf+12, (size_t)i-12, 1, stdout);
}
}
sn = u; ts = v;
/* Keep Alive */
ct = time(0);
if(ct-init > 15)
{
tim += (ct-init)*1000000/TIME_RESOLUTION;
rtpbuf[0] = (2<<6);
/* padding, extension, csrc are empty */
rtpbuf[1] = 96;
/* marker is empty */
rtpbuf[2] = (seq>>8)&0xFF;
rtpbuf[3] = (seq)&0xFF;
rtpbuf[4] = (tim>>24)&0xFF;
rtpbuf[5] = (tim>>16)&0xFF;
rtpbuf[6] = (tim>>8)&0xFF;
rtpbuf[7] = (tim)&0xFF;
/* sequence and timestamp are empty */
rtpbuf[8] = (session>>24)&0xFF;
rtpbuf[9] = (session>>16)&0xFF;
rtpbuf[10] = (session>>8)&0xFF;
rtpbuf[11] = (session)&0xFF;
++seq;
init = ct;
if(send(sockfd, rtpbuf, 12, 0) != 12)
{
myperror("send");
error = 1;
}
}
}
else if(i >= 0)
{
fprintf(stderr, "Illegal UDP header.\n");
continue;
}
}
}
/* send connection close always to allow nice session closing */
tim += (time(0)-init)*1000000/TIME_RESOLUTION;
rtpbuf[0] = (2<<6);
/* padding, extension, csrc are empty */
rtpbuf[1] = 98;
/* marker is empty */
rtpbuf[2] = (seq>>8)&0xFF;
rtpbuf[3] = (seq)&0xFF;
rtpbuf[4] = (tim>>24)&0xFF;
rtpbuf[5] = (tim>>16)&0xFF;
rtpbuf[6] = (tim>>8)&0xFF;
rtpbuf[7] = (tim)&0xFF;
/* sequence and timestamp are empty */
rtpbuf[8] = (session>>24)&0xFF;
rtpbuf[9] = (session>>16)&0xFF;
rtpbuf[10] = (session>>8)&0xFF;
rtpbuf[11] = (session)&0xFF;
send(sockfd, rtpbuf, 12, 0); /* cleanup */
}
}
}
}
else if(args.data && *args.data != '%' && args.mode == RTSP)
{
struct sockaddr_in local;
sockettype sockudp = 0;
int localport = 0;
int cseq = 1;
socklen_t len;
if((sockudp = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
{
myperror("socket");
error = 1;
}
if(!stop && !error)
{
/* fill structure with local address information for UDP */
memset(&local, 0, sizeof(local));
local.sin_family = AF_INET;
local.sin_port = htons(args.udpport);
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)
{
myperror("bind");
error = 1;
}
else if((::getsockname(sockudp, (struct sockaddr*)&local, &len)) == -1)
{
myperror("local access failed");
error = 1;
}
else if(::connect(sockfd, (struct sockaddr *)&their_addr,
sizeof(struct sockaddr)) == -1)
{
myperror("connect");
error = 1;
}
localport = ntohs(local.sin_port);
}
if(!stop && !error)
{
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"
"%s%s%s"
"Transport: RTP/GNSS;unicast;client_port=%u%s",
args.server, proxyserver ? ":" : "", proxyserver ? args.port : "",
args.data, cseq++, AGENTSTRING, revisionstr,
args.nmea ? "Ntrip-GGA: " : "", args.nmea ? args.nmea : "",
args.nmea ? "\r\n" : "",
localport,
(*args.user || *args.password) ? "\r\nAuthorization: Basic " : "");
if(i > MAXDATASIZE-40 || i < 0) /* second check for old glibc */
{
fprintf(stderr, "Requested data too long\n");
stop = 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");
stop = 1;
}
buf[i++] = '\r';
buf[i++] = '\n';
buf[i++] = '\r';
buf[i++] = '\n';
}
if(!stop && !error)
{
if(send(sockfd, buf, (size_t)i, 0) != i)
{
myperror("send");
error = 1;
}
else if((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) == -1)
{
myperror("recv");
error = 1;
}
else 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");
stop = 1;
}
else