1 | /*
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2 | Easy example NTRIP client for Linux/Unix.
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3 | Copyright (C) 2003 by Dirk Stoecker <stoecker@epost.de>
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4 |
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5 | This program is free software; you can redistribute it and/or modify
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6 | it under the terms of the GNU General Public License as published by
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7 | the Free Software Foundation; either version 2 of the License, or
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8 | (at your option) any later version.
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9 |
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10 | This program is distributed in the hope that it will be useful,
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | GNU General Public License for more details.
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14 |
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15 | You should have received a copy of the GNU General Public License
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16 | along with this program; if not, write to the Free Software
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17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 | or read http://www.gnu.org/licenses/gpl.txt
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19 | */
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20 |
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21 | /* Version history
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22 | Please always keep revision history and the two related strings up to date!
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23 | 1.1 2003-02-24 stoecker initial version
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24 | 1.2 2003-02-25 stoecker fixed agent string
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25 | */
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26 |
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27 | #include <getopt.h>
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28 | #include <stdio.h>
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29 | #include <stdlib.h>
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30 | #include <unistd.h>
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31 | #include <errno.h>
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32 | #include <string.h>
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33 | #include <netdb.h>
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34 | #include <sys/types.h>
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35 | #include <netinet/in.h>
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36 | #include <sys/socket.h>
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37 |
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38 | /* The string, which is send as agent in HTTP request */
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39 | #define AGENTSTRING "NTRIP NtripLinuxClient"
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40 |
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41 | #define MAXDATASIZE 1000 /* max number of bytes we can get at once */
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42 | char buf[MAXDATASIZE];
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43 |
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44 | /* CVS revision and version */
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45 | static char revisionstr[] = "$Revision: 1.1 $";
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46 | static char datestr[] = "$Date: 2003/08/21 13:38:47 $";
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47 |
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48 | struct Args
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49 | {
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50 | char *server;
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51 | int port;
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52 | char *user;
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53 | char *password;
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54 | char *data;
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55 | };
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56 |
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57 | /* option parsing */
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58 | #ifdef NO_LONG_OPTS
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59 | #define LONG_OPT(a)
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60 | #else
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61 | #define LONG_OPT(a) a
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62 | static struct option opts[] = {
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63 | { "data", required_argument, 0, 'd'},
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64 | { "server", required_argument, 0, 's'},
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65 | { "password", required_argument, 0, 'p'},
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66 | { "port", required_argument, 0, 'r'},
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67 | { "user", required_argument, 0, 'u'},
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68 | { "help", no_argument, 0, 'h'},
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69 | {0,0,0,0}};
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70 | #endif
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71 | #define ARGOPT "d:hp:r:s:u:"
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72 |
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73 | static int getargs(int argc, char **argv, struct Args *args)
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74 | {
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75 | int res = 1;
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76 | int getoptr;
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77 | char *a;
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78 | int i = 0, help = 0;
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79 | char *t;
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80 |
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81 | args->server = "129.217.182.51";
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82 | args->port = 80;
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83 | args->user = "";
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84 | args->password = "";
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85 | args->data = 0;
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86 | help = 0;
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87 |
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88 | do
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89 | {
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90 | #ifdef NO_LONG_OPTS
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91 | switch((getoptr = getopt(argc, argv, ARGOPT)))
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92 | #else
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93 | switch((getoptr = getopt_long(argc, argv, ARGOPT, opts, 0)))
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94 | #endif
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95 | {
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96 | case 's': args->server = optarg; break;
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97 | case 'u': args->user = optarg; break;
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98 | case 'p': args->password = optarg; break;
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99 | case 'd': args->data = optarg; break;
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100 | case 'h': help=1; break;
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101 | case 'r':
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102 | args->port = strtoul(optarg, &t, 10);
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103 | if((t && *t) || args->port < 1 || args->port > 65535)
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104 | res = 0;
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105 | break;
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106 | case -1: break;
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107 | }
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108 | } while(getoptr != -1 || !res);
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109 |
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110 | for(a = revisionstr+11; *a && *a != ' '; ++a)
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111 | revisionstr[i++] = *a;
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112 | revisionstr[i] = 0;
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113 | datestr[0] = datestr[7];
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114 | datestr[1] = datestr[8];
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115 | datestr[2] = datestr[9];
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116 | datestr[3] = datestr[10];
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117 | datestr[5] = datestr[12];
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118 | datestr[6] = datestr[13];
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119 | datestr[8] = datestr[15];
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120 | datestr[9] = datestr[16];
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121 | datestr[4] = datestr[7] = '-';
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122 | datestr[10] = 0;
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123 |
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124 | if(!res || help)
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125 | {
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126 | fprintf(stderr, "Version %s (%s) GPL\nUsage: %s -s server -u user ...\n"
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127 | " -d " LONG_OPT("--data ") "the requested data set\n"
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128 | " -s " LONG_OPT("--server ") "the server name or address\n"
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129 | " -p " LONG_OPT("--password ") "the login password\n"
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130 | " -r " LONG_OPT("--port ") "the server port number (default 80)\n"
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131 | " -u " LONG_OPT("--user ") "the user name\n"
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132 | , revisionstr, datestr, argv[0]);
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133 | exit(1);
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134 | }
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135 | return res;
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136 | }
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137 |
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138 | static char encodingTable [64] = {
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139 | 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
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140 | 'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
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141 | 'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
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142 | 'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/'
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143 | };
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144 |
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145 | /* does not buffer overrun, but breaks directly after an error */
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146 | /* returns the number of required bytes */
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147 | static int encode(char *buf, int size, char *user, char *pwd)
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148 | {
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149 | unsigned char inbuf[3];
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150 | char *out = buf;
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151 | int i, sep = 0, fill = 0, bytes = 0;
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152 |
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153 | while(*user || *pwd)
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154 | {
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155 | i = 0;
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156 | while(i < 3 && *user) inbuf[i++] = *(user++);
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157 | if(i < 3 && !sep) {inbuf[i++] = ':'; ++sep; }
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158 | while(i < 3 && *pwd) inbuf[i++] = *(pwd++);
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159 | while(i < 3) {inbuf[i++] = 0; ++fill; }
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160 | if(out-buf < size-1)
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161 | *(out++) = encodingTable[(inbuf [0] & 0xFC) >> 2];
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162 | if(out-buf < size-1)
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163 | *(out++) = encodingTable[((inbuf [0] & 0x03) << 4)
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164 | | ((inbuf [1] & 0xF0) >> 4)];
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165 | if(out-buf < size-1)
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166 | {
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167 | if(fill == 2)
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168 | *(out++) = '=';
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169 | else
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170 | *(out++) = encodingTable[((inbuf [1] & 0x0F) << 2)
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171 | | ((inbuf [2] & 0xC0) >> 6)];
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172 | }
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173 | if(out-buf < size-1)
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174 | {
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175 | if(fill >= 1)
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176 | *(out++) = '=';
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177 | else
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178 | *(out++) = encodingTable[inbuf [2] & 0x3F];
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179 | }
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180 | bytes += 4;
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181 | }
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182 | if(out-buf < size)
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183 | *out = 0;
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184 | return bytes;
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185 | }
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186 |
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187 | int main(int argc, char **argv)
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188 | {
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189 | struct Args args;
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190 |
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191 | if(getargs(argc, argv, &args))
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192 | {
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193 | int i, sockfd, numbytes;
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194 | char buf[MAXDATASIZE];
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195 | struct hostent *he;
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196 | struct sockaddr_in their_addr; /* connector's address information */
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197 |
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198 | if(!(he=gethostbyname(args.server)))
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199 | {
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200 | perror("gethostbyname");
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201 | exit(1);
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202 | }
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203 | if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
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204 | {
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205 | perror("socket");
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206 | exit(1);
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207 | }
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208 | their_addr.sin_family = AF_INET; /* host byte order */
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209 | their_addr.sin_port = htons(args.port); /* short, network byte order */
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210 | their_addr.sin_addr = *((struct in_addr *)he->h_addr);
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211 | memset(&(their_addr.sin_zero), '\0', 8);
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212 | if(connect(sockfd, (struct sockaddr *)&their_addr,
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213 | sizeof(struct sockaddr)) == -1)
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214 | {
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215 | perror("connect");
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216 | exit(1);
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217 | }
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218 |
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219 | if(!args.data)
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220 | {
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221 | i = snprintf(buf, MAXDATASIZE,
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222 | "GET / HTTP/1.0\r\n"
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223 | "User-Agent: %s/%s\r\n"
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224 | // "Accept: */*\r\n"
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225 | // "Connection: close\r\n"
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226 | "\r\n"
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227 | , AGENTSTRING, revisionstr);
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228 | }
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229 | else
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230 | {
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231 | i=snprintf(buf, MAXDATASIZE-40, /* leave some space for login */
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232 | "GET /%s HTTP/1.0\r\n"
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233 | "User-Agent: %s/%s\r\n"
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234 | // "Accept: */*\r\n"
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235 | // "Connection: close\r\n"
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236 | "Authorization: Basic "
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237 | , args.data, AGENTSTRING, revisionstr);
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238 | if(i > MAXDATASIZE-40 && i < 0) /* second check for old glibc */
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239 | {
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240 | fprintf(stderr, "Requested data too long\n");
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241 | exit(1);
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242 | }
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243 | i += encode(buf+i, MAXDATASIZE-i-5, args.user, args.password);
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244 | if(i > MAXDATASIZE-5)
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245 | {
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246 | fprintf(stderr, "Username and/or password too long\n");
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247 | exit(1);
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248 | }
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249 | snprintf(buf+i, 5, "\r\n\r\n");
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250 | i += 5;
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251 | }
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252 | if(send(sockfd, buf, i, 0) != i)
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253 | {
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254 | perror("send");
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255 | exit(1);
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256 | }
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257 | if(args.data)
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258 | {
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259 | int k = 0;
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260 | while((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) != -1)
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261 | {
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262 | if(!k)
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263 | {
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264 | if(numbytes != 12 || strncmp("ICY 200 OK\r\n", buf, 12))
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265 | {
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266 | fprintf(stderr, "Could not get the requested data\n");
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267 | exit(1);
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268 | }
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269 | ++k;
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270 | }
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271 | else
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272 | fwrite(buf, numbytes, 1, stdout);
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273 | }
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274 | }
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275 | else
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276 | {
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277 | while((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) != -1)
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278 | {
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279 | fwrite(buf, numbytes, 1, stdout);
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280 | if(!strncmp("ENDSOURCETABLE\r\n", buf+numbytes-16, 16))
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281 | break;
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282 | }
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283 | }
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284 |
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285 | close(sockfd);
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286 | }
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287 | return 0;
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288 | }
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