Index: trunk/ntripclient/ntripclient.c =================================================================== --- trunk/ntripclient/ntripclient.c (revision 483) +++ trunk/ntripclient/ntripclient.c (revision 483) @@ -0,0 +1,451 @@ +/* + Easy example NTRIP client for Linux/Unix. + $Id: NtripLinuxClient.c,v 1.28 2007/08/23 06:55:36 stoecker Exp $ + Copyright (C) 2003-2005 by Dirk Stoecker + + 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifndef COMPILEDATE +#define COMPILEDATE " built " __DATE__ +#endif + +/* The string, which is send as agent in HTTP request */ +#define AGENTSTRING "NTRIP NtripLinuxClient" + +#define MAXDATASIZE 1000 /* max number of bytes we can get at once */ +#define ALARMTIME (2*60) + +/* CVS revision and version */ +static char revisionstr[] = "$Revision: 1.28 $"; +static char datestr[] = "$Date: 2007/08/23 06:55:36 $"; + +struct Args +{ + const char *server; + int port; + const char *user; + const char *password; + const char *nmea; + const char *data; + int bitrate; +}; + +/* 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'}, +{ "user", required_argument, 0, 'u'}, +{ "nmea", required_argument, 0, 'n'}, +{ "help", no_argument, 0, 'h'}, +{0,0,0,0}}; +#endif +#define ARGOPT "-d:bhp:r:s:u:n:" + +#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); +} + +static const char *geturl(const char *url, struct Args *args) +{ + static char buf[1000]; + static char *Buffer = buf; + static char *Bufend = buf+sizeof(buf); + + if(strncmp("ntrip:", url, 6)) + return "URL must start with 'ntrip:'."; + url += 6; /* skip ntrip: */ + + if(*url != '@' && *url != '/') + { + /* scan for mountpoint */ + args->data = Buffer; + while(*url && *url != '@' && *url != ';' &&*url != '/' && Buffer != Bufend) + *(Buffer++) = *(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; + args->server = Buffer; + while(*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 == ':') + { + char *s2 = 0; + args->port = strtol(++url, &s2, 10); + if((*s2 && *s2 != ';') || args->port <= 0 || args->port > 0xFFFF) + return "Illegal port number."; + url = s2; + } + } + 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; + char *t; + + args->server = "www.euref-ip.net"; + args->port = 2101; + args->user = ""; + args->password = ""; + args->nmea = 0; + args->data = 0; + args->bitrate = 0; + 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': args->data = optarg; break; + case 'n': args->nmea = optarg; break; + case 'b': args->bitrate = 1; break; + case 'h': help=1; break; + case 1: + { + const char *err; + if((err = geturl(optarg, args))) + { + fprintf(stderr, "%s\n\n", err); + res = 0; + } + } + break; + case 'r': + args->port = strtoul(optarg, &t, 10); + if((t && *t) || args->port < 1 || args->port > 65535) + 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" + "or using an URL:\n%s ntrip:mountpoint[/username[:password]][@server[:port]][;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); + alarm(ALARMTIME); + + if(getargs(argc, argv, &args)) + { + int i, sockfd, numbytes; + char buf[MAXDATASIZE]; + struct hostent *he; + struct sockaddr_in their_addr; /* connector's address information */ + + if(!(he=gethostbyname(args.server))) + { + fprintf(stderr, "Server name lookup failed for '%s'.\n", args.server); + exit(1); + } + if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) + { + perror("socket"); + exit(1); + } + their_addr.sin_family = AF_INET; /* host byte order */ + their_addr.sin_port = htons(args.port); /* short, network byte order */ + their_addr.sin_addr = *((struct in_addr *)he->h_addr); + memset(&(their_addr.sin_zero), '\0', 8); + if(connect(sockfd, (struct sockaddr *)&their_addr, + sizeof(struct sockaddr)) == -1) + { + perror("connect"); + exit(1); + } + + if(!args.data) + { + i = snprintf(buf, MAXDATASIZE, + "GET / HTTP/1.0\r\n" + "User-Agent: %s/%s\r\n" +#ifdef UNUSED + "Accept: */*\r\n" + "Connection: close\r\n" +#endif + "\r\n" + , AGENTSTRING, revisionstr); + } + else + { + i=snprintf(buf, MAXDATASIZE-40, /* leave some space for login */ + "GET /%s HTTP/1.0\r\n" + "User-Agent: %s/%s\r\n" +#ifdef UNUSED + "Accept: */*\r\n" + "Connection: close\r\n" +#endif + "Authorization: Basic " + , args.data, 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) + { + int k = 0; + int starttime = time(0); + int lastout = starttime; + int totalbytes = 0; + + while((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) != -1) + { + alarm(ALARMTIME); + if(!k) + { + 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); + } + ++k; + } + else + { + totalbytes += numbytes; + if(totalbytes < 0) /* overflow */ + { + totalbytes = 0; + starttime = time(0); + lastout = starttime; + } + fwrite(buf, (size_t)numbytes, 1, stdout); + fflush(stdout); + 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 + { + while((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) > 0) + { + fwrite(buf, (size_t)numbytes, 1, stdout); + } + } + + close(sockfd); + } + return 0; +}