1 | /* $Id: miniwget.c,v 1.56 2012/05/01 16:16:08 nanard Exp $ */ |
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2 | /* Project : miniupnp |
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3 | * Website : http://miniupnp.free.fr/ |
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4 | * Author : Thomas Bernard |
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5 | * Copyright (c) 2005-2012 Thomas Bernard |
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6 | * This software is subject to the conditions detailed in the |
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7 | * LICENCE file provided in this distribution. */ |
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8 | |
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9 | #include <stdio.h> |
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10 | #include <stdlib.h> |
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11 | #include <string.h> |
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12 | #include <ctype.h> |
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13 | #ifdef _WIN32 |
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14 | #include <winsock2.h> |
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15 | #include <ws2tcpip.h> |
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16 | #include <io.h> |
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17 | #define MAXHOSTNAMELEN 64 |
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18 | #define MIN(x,y) (((x)<(y))?(x):(y)) |
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19 | #define snprintf _snprintf |
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20 | #define socklen_t int |
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21 | #ifndef strncasecmp |
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22 | #if defined(_MSC_VER) && (_MSC_VER >= 1400) |
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23 | #define strncasecmp _memicmp |
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24 | #else /* defined(_MSC_VER) && (_MSC_VER >= 1400) */ |
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25 | #define strncasecmp memicmp |
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26 | #endif /* defined(_MSC_VER) && (_MSC_VER >= 1400) */ |
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27 | #endif /* #ifndef strncasecmp */ |
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28 | #else /* #ifdef _WIN32 */ |
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29 | #include <unistd.h> |
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30 | #include <sys/param.h> |
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31 | #if defined(__amigaos__) && !defined(__amigaos4__) |
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32 | #define socklen_t int |
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33 | #else /* #if defined(__amigaos__) && !defined(__amigaos4__) */ |
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34 | #include <sys/select.h> |
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35 | #endif /* #else defined(__amigaos__) && !defined(__amigaos4__) */ |
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36 | #include <sys/socket.h> |
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37 | #include <netinet/in.h> |
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38 | #include <arpa/inet.h> |
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39 | #include <netdb.h> |
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40 | #define closesocket close |
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41 | /* defining MINIUPNPC_IGNORE_EINTR enable the ignore of interruptions |
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42 | * during the connect() call */ |
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43 | #define MINIUPNPC_IGNORE_EINTR |
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44 | #endif /* #else _WIN32 */ |
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45 | #if defined(__sun) || defined(sun) |
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46 | #define MIN(x,y) (((x)<(y))?(x):(y)) |
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47 | #endif |
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48 | |
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49 | #include "miniupnpcstrings.h" |
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50 | #include "miniwget.h" |
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51 | #include "connecthostport.h" |
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52 | #include "receivedata.h" |
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53 | |
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54 | /* |
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55 | * Read a HTTP response from a socket. |
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56 | * Process Content-Length and Transfer-encoding headers. |
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57 | * return a pointer to the content buffer, which length is saved |
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58 | * to the length parameter. |
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59 | */ |
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60 | void * |
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61 | getHTTPResponse(int s, int * size) |
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62 | { |
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63 | char buf[2048]; |
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64 | int n; |
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65 | int endofheaders = 0; |
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66 | int chunked = 0; |
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67 | int content_length = -1; |
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68 | unsigned int chunksize = 0; |
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69 | unsigned int bytestocopy = 0; |
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70 | /* buffers : */ |
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71 | char * header_buf; |
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72 | unsigned int header_buf_len = 2048; |
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73 | unsigned int header_buf_used = 0; |
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74 | char * content_buf; |
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75 | unsigned int content_buf_len = 2048; |
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76 | unsigned int content_buf_used = 0; |
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77 | char chunksize_buf[32]; |
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78 | unsigned int chunksize_buf_index; |
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79 | |
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80 | header_buf = malloc(header_buf_len); |
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81 | content_buf = malloc(content_buf_len); |
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82 | chunksize_buf[0] = '\0'; |
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83 | chunksize_buf_index = 0; |
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84 | |
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85 | while((n = receivedata(s, buf, 2048, 5000)) > 0) |
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86 | { |
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87 | if(endofheaders == 0) |
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88 | { |
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89 | int i; |
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90 | int linestart=0; |
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91 | int colon=0; |
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92 | int valuestart=0; |
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93 | if(header_buf_used + n > header_buf_len) { |
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94 | header_buf = realloc(header_buf, header_buf_used + n); |
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95 | header_buf_len = header_buf_used + n; |
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96 | } |
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97 | memcpy(header_buf + header_buf_used, buf, n); |
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98 | header_buf_used += n; |
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99 | /* search for CR LF CR LF (end of headers) |
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100 | * recognize also LF LF */ |
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101 | i = 0; |
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102 | while(i < ((int)header_buf_used-1) && (endofheaders == 0)) { |
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103 | if(header_buf[i] == '\r') { |
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104 | i++; |
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105 | if(header_buf[i] == '\n') { |
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106 | i++; |
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107 | if(i < (int)header_buf_used && header_buf[i] == '\r') { |
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108 | i++; |
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109 | if(i < (int)header_buf_used && header_buf[i] == '\n') { |
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110 | endofheaders = i+1; |
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111 | } |
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112 | } |
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113 | } |
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114 | } else if(header_buf[i] == '\n') { |
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115 | i++; |
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116 | if(header_buf[i] == '\n') { |
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117 | endofheaders = i+1; |
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118 | } |
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119 | } |
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120 | i++; |
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121 | } |
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122 | if(endofheaders == 0) |
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123 | continue; |
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124 | /* parse header lines */ |
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125 | for(i = 0; i < endofheaders - 1; i++) { |
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126 | if(colon <= linestart && header_buf[i]==':') |
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127 | { |
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128 | colon = i; |
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129 | while(i < (endofheaders-1) |
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130 | && (header_buf[i+1] == ' ' || header_buf[i+1] == '\t')) |
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131 | i++; |
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132 | valuestart = i + 1; |
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133 | } |
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134 | /* detecting end of line */ |
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135 | else if(header_buf[i]=='\r' || header_buf[i]=='\n') |
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136 | { |
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137 | if(colon > linestart && valuestart > colon) |
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138 | { |
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139 | #ifdef DEBUG |
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140 | printf("header='%.*s', value='%.*s'\n", |
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141 | colon-linestart, header_buf+linestart, |
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142 | i-valuestart, header_buf+valuestart); |
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143 | #endif |
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144 | if(0==strncasecmp(header_buf+linestart, "content-length", colon-linestart)) |
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145 | { |
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146 | content_length = atoi(header_buf+valuestart); |
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147 | #ifdef DEBUG |
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148 | printf("Content-Length: %d\n", content_length); |
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149 | #endif |
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150 | } |
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151 | else if(0==strncasecmp(header_buf+linestart, "transfer-encoding", colon-linestart) |
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152 | && 0==strncasecmp(header_buf+valuestart, "chunked", 7)) |
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153 | { |
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154 | #ifdef DEBUG |
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155 | printf("chunked transfer-encoding!\n"); |
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156 | #endif |
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157 | chunked = 1; |
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158 | } |
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159 | } |
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160 | while(header_buf[i]=='\r' || header_buf[i] == '\n') |
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161 | i++; |
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162 | linestart = i; |
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163 | colon = linestart; |
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164 | valuestart = 0; |
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165 | } |
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166 | } |
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167 | /* copy the remaining of the received data back to buf */ |
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168 | n = header_buf_used - endofheaders; |
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169 | memcpy(buf, header_buf + endofheaders, n); |
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170 | /* if(headers) */ |
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171 | } |
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172 | if(endofheaders) |
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173 | { |
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174 | /* content */ |
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175 | if(chunked) |
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176 | { |
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177 | int i = 0; |
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178 | while(i < n) |
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179 | { |
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180 | if(chunksize == 0) |
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181 | { |
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182 | /* reading chunk size */ |
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183 | if(chunksize_buf_index == 0) { |
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184 | /* skipping any leading CR LF */ |
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185 | if(i<n && buf[i] == '\r') i++; |
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186 | if(i<n && buf[i] == '\n') i++; |
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187 | } |
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188 | while(i<n && isxdigit(buf[i]) |
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189 | && chunksize_buf_index < (sizeof(chunksize_buf)-1)) |
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190 | { |
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191 | chunksize_buf[chunksize_buf_index++] = buf[i]; |
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192 | chunksize_buf[chunksize_buf_index] = '\0'; |
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193 | i++; |
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194 | } |
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195 | while(i<n && buf[i] != '\r' && buf[i] != '\n') |
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196 | i++; /* discarding chunk-extension */ |
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197 | if(i<n && buf[i] == '\r') i++; |
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198 | if(i<n && buf[i] == '\n') { |
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199 | unsigned int j; |
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200 | for(j = 0; j < chunksize_buf_index; j++) { |
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201 | if(chunksize_buf[j] >= '0' |
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202 | && chunksize_buf[j] <= '9') |
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203 | chunksize = (chunksize << 4) + (chunksize_buf[j] - '0'); |
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204 | else |
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205 | chunksize = (chunksize << 4) + ((chunksize_buf[j] | 32) - 'a' + 10); |
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206 | } |
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207 | chunksize_buf[0] = '\0'; |
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208 | chunksize_buf_index = 0; |
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209 | i++; |
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210 | } else { |
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211 | /* not finished to get chunksize */ |
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212 | continue; |
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213 | } |
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214 | #ifdef DEBUG |
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215 | printf("chunksize = %u (%x)\n", chunksize, chunksize); |
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216 | #endif |
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217 | if(chunksize == 0) |
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218 | { |
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219 | #ifdef DEBUG |
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220 | printf("end of HTTP content - %d %d\n", i, n); |
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221 | /*printf("'%.*s'\n", n-i, buf+i);*/ |
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222 | #endif |
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223 | goto end_of_stream; |
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224 | } |
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225 | } |
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226 | bytestocopy = ((int)chunksize < (n - i))?chunksize:(unsigned int)(n - i); |
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227 | if((content_buf_used + bytestocopy) > content_buf_len) |
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228 | { |
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229 | if(content_length >= (int)(content_buf_used + bytestocopy)) { |
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230 | content_buf_len = content_length; |
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231 | } else { |
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232 | content_buf_len = content_buf_used + bytestocopy; |
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233 | } |
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234 | content_buf = (char *)realloc((void *)content_buf, |
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235 | content_buf_len); |
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236 | } |
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237 | memcpy(content_buf + content_buf_used, buf + i, bytestocopy); |
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238 | content_buf_used += bytestocopy; |
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239 | i += bytestocopy; |
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240 | chunksize -= bytestocopy; |
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241 | } |
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242 | } |
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243 | else |
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244 | { |
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245 | /* not chunked */ |
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246 | if(content_length > 0 |
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247 | && (int)(content_buf_used + n) > content_length) { |
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248 | /* skipping additional bytes */ |
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249 | n = content_length - content_buf_used; |
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250 | } |
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251 | if(content_buf_used + n > content_buf_len) |
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252 | { |
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253 | if(content_length >= (int)(content_buf_used + n)) { |
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254 | content_buf_len = content_length; |
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255 | } else { |
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256 | content_buf_len = content_buf_used + n; |
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257 | } |
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258 | content_buf = (char *)realloc((void *)content_buf, |
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259 | content_buf_len); |
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260 | } |
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261 | memcpy(content_buf + content_buf_used, buf, n); |
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262 | content_buf_used += n; |
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263 | } |
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264 | } |
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265 | /* use the Content-Length header value if available */ |
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266 | if(content_length > 0 && (int)content_buf_used >= content_length) |
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267 | { |
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268 | #ifdef DEBUG |
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269 | printf("End of HTTP content\n"); |
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270 | #endif |
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271 | break; |
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272 | } |
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273 | } |
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274 | end_of_stream: |
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275 | free(header_buf); header_buf = NULL; |
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276 | *size = content_buf_used; |
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277 | if(content_buf_used == 0) |
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278 | { |
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279 | free(content_buf); |
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280 | content_buf = NULL; |
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281 | } |
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282 | return content_buf; |
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283 | } |
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284 | |
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285 | /* miniwget3() : |
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286 | * do all the work. |
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287 | * Return NULL if something failed. */ |
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288 | static void * |
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289 | miniwget3(const char * host, |
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290 | unsigned short port, const char * path, |
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291 | int * size, char * addr_str, int addr_str_len, |
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292 | const char * httpversion) |
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293 | { |
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294 | char buf[2048]; |
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295 | int s; |
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296 | int n; |
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297 | int len; |
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298 | int sent; |
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299 | void * content; |
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300 | |
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301 | *size = 0; |
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302 | s = connecthostport(host, port); |
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303 | if(s < 0) |
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304 | return NULL; |
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305 | |
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306 | /* get address for caller ! */ |
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307 | if(addr_str) |
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308 | { |
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309 | struct sockaddr_storage saddr; |
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310 | socklen_t saddrlen; |
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311 | |
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312 | saddrlen = sizeof(saddr); |
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313 | if(getsockname(s, (struct sockaddr *)&saddr, &saddrlen) < 0) |
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314 | { |
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315 | perror("getsockname"); |
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316 | } |
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317 | else |
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318 | { |
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319 | #if defined(__amigaos__) && !defined(__amigaos4__) |
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320 | /* using INT WINAPI WSAAddressToStringA(LPSOCKADDR, DWORD, LPWSAPROTOCOL_INFOA, LPSTR, LPDWORD); |
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321 | * But his function make a string with the port : nn.nn.nn.nn:port */ |
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322 | /* if(WSAAddressToStringA((SOCKADDR *)&saddr, sizeof(saddr), |
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323 | NULL, addr_str, (DWORD *)&addr_str_len)) |
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324 | { |
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325 | printf("WSAAddressToStringA() failed : %d\n", WSAGetLastError()); |
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326 | }*/ |
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327 | /* the following code is only compatible with ip v4 addresses */ |
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328 | strncpy(addr_str, inet_ntoa(((struct sockaddr_in *)&saddr)->sin_addr), addr_str_len); |
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329 | #else |
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330 | #if 0 |
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331 | if(saddr.sa_family == AF_INET6) { |
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332 | inet_ntop(AF_INET6, |
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333 | &(((struct sockaddr_in6 *)&saddr)->sin6_addr), |
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334 | addr_str, addr_str_len); |
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335 | } else { |
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336 | inet_ntop(AF_INET, |
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337 | &(((struct sockaddr_in *)&saddr)->sin_addr), |
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338 | addr_str, addr_str_len); |
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339 | } |
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340 | #endif |
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341 | /* getnameinfo return ip v6 address with the scope identifier |
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342 | * such as : 2a01:e35:8b2b:7330::%4281128194 */ |
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343 | n = getnameinfo((const struct sockaddr *)&saddr, saddrlen, |
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344 | addr_str, addr_str_len, |
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345 | NULL, 0, |
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346 | NI_NUMERICHOST | NI_NUMERICSERV); |
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347 | if(n != 0) { |
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348 | #ifdef _WIN32 |
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349 | fprintf(stderr, "getnameinfo() failed : %d\n", n); |
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350 | #else |
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351 | fprintf(stderr, "getnameinfo() failed : %s\n", gai_strerror(n)); |
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352 | #endif |
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353 | } |
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354 | #endif |
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355 | } |
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356 | #ifdef DEBUG |
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357 | printf("address miniwget : %s\n", addr_str); |
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358 | #endif |
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359 | } |
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360 | |
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361 | len = snprintf(buf, sizeof(buf), |
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362 | "GET %s HTTP/%s\r\n" |
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363 | "Host: %s:%d\r\n" |
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364 | "Connection: Close\r\n" |
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365 | "User-Agent: " OS_STRING ", UPnP/1.0, MiniUPnPc/" MINIUPNPC_VERSION_STRING "\r\n" |
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366 | |
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367 | "\r\n", |
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368 | path, httpversion, host, port); |
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369 | sent = 0; |
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370 | /* sending the HTTP request */ |
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371 | while(sent < len) |
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372 | { |
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373 | n = send(s, buf+sent, len-sent, 0); |
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374 | if(n < 0) |
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375 | { |
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376 | perror("send"); |
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377 | closesocket(s); |
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378 | return NULL; |
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379 | } |
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380 | else |
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381 | { |
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382 | sent += n; |
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383 | } |
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384 | } |
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385 | content = getHTTPResponse(s, size); |
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386 | closesocket(s); |
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387 | return content; |
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388 | } |
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389 | |
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390 | /* miniwget2() : |
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391 | * Call miniwget3(); retry with HTTP/1.1 if 1.0 fails. */ |
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392 | static void * |
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393 | miniwget2(const char * host, |
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394 | unsigned short port, const char * path, |
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395 | int * size, char * addr_str, int addr_str_len) |
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396 | { |
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397 | char * respbuffer; |
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398 | |
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399 | respbuffer = miniwget3(host, port, path, size, addr_str, addr_str_len, "1.1"); |
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400 | /* |
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401 | respbuffer = miniwget3(host, port, path, size, addr_str, addr_str_len, "1.0"); |
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402 | if (*size == 0) |
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403 | { |
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404 | #ifdef DEBUG |
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405 | printf("Retrying with HTTP/1.1\n"); |
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406 | #endif |
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407 | free(respbuffer); |
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408 | respbuffer = miniwget3(host, port, path, size, addr_str, addr_str_len, "1.1"); |
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409 | } |
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410 | */ |
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411 | return respbuffer; |
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412 | } |
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413 | |
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414 | |
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415 | |
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416 | |
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417 | /* parseURL() |
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418 | * arguments : |
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419 | * url : source string not modified |
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420 | * hostname : hostname destination string (size of MAXHOSTNAMELEN+1) |
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421 | * port : port (destination) |
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422 | * path : pointer to the path part of the URL |
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423 | * |
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424 | * Return values : |
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425 | * 0 - Failure |
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426 | * 1 - Success */ |
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427 | int parseURL(const char * url, char * hostname, unsigned short * port, char * * path) |
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428 | { |
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429 | char * p1, *p2, *p3; |
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430 | if(!url) |
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431 | return 0; |
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432 | p1 = strstr(url, "://"); |
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433 | if(!p1) |
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434 | return 0; |
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435 | p1 += 3; |
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436 | if( (url[0]!='h') || (url[1]!='t') |
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437 | ||(url[2]!='t') || (url[3]!='p')) |
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438 | return 0; |
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439 | memset(hostname, 0, MAXHOSTNAMELEN + 1); |
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440 | if(*p1 == '[') |
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441 | { |
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442 | /* IP v6 : http://[2a00:1450:8002::6a]/path/abc */ |
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443 | p2 = strchr(p1, ']'); |
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444 | p3 = strchr(p1, '/'); |
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445 | if(p2 && p3) |
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446 | { |
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447 | p2++; |
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448 | strncpy(hostname, p1, MIN(MAXHOSTNAMELEN, (int)(p2-p1))); |
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449 | if(*p2 == ':') |
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450 | { |
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451 | *port = 0; |
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452 | p2++; |
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453 | while( (*p2 >= '0') && (*p2 <= '9')) |
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454 | { |
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455 | *port *= 10; |
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456 | *port += (unsigned short)(*p2 - '0'); |
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457 | p2++; |
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458 | } |
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459 | } |
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460 | else |
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461 | { |
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462 | *port = 80; |
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463 | } |
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464 | *path = p3; |
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465 | return 1; |
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466 | } |
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467 | } |
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468 | p2 = strchr(p1, ':'); |
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469 | p3 = strchr(p1, '/'); |
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470 | if(!p3) |
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471 | return 0; |
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472 | if(!p2 || (p2>p3)) |
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473 | { |
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474 | strncpy(hostname, p1, MIN(MAXHOSTNAMELEN, (int)(p3-p1))); |
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475 | *port = 80; |
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476 | } |
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477 | else |
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478 | { |
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479 | strncpy(hostname, p1, MIN(MAXHOSTNAMELEN, (int)(p2-p1))); |
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480 | *port = 0; |
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481 | p2++; |
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482 | while( (*p2 >= '0') && (*p2 <= '9')) |
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483 | { |
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484 | *port *= 10; |
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485 | *port += (unsigned short)(*p2 - '0'); |
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486 | p2++; |
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487 | } |
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488 | } |
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489 | *path = p3; |
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490 | return 1; |
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491 | } |
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492 | |
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493 | void * miniwget(const char * url, int * size) |
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494 | { |
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495 | unsigned short port; |
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496 | char * path; |
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497 | /* protocol://host:port/chemin */ |
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498 | char hostname[MAXHOSTNAMELEN+1]; |
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499 | *size = 0; |
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500 | if(!parseURL(url, hostname, &port, &path)) |
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501 | return NULL; |
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502 | #ifdef DEBUG |
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503 | printf("parsed url : hostname='%s' port=%hu path='%s'\n", hostname, port, path); |
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504 | #endif |
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505 | return miniwget2(hostname, port, path, size, 0, 0); |
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506 | } |
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507 | |
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508 | void * miniwget_getaddr(const char * url, int * size, char * addr, int addrlen) |
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509 | { |
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510 | unsigned short port; |
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511 | char * path; |
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512 | /* protocol://host:port/path */ |
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513 | char hostname[MAXHOSTNAMELEN+1]; |
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514 | *size = 0; |
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515 | if(addr) |
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516 | addr[0] = '\0'; |
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517 | if(!parseURL(url, hostname, &port, &path)) |
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518 | return NULL; |
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519 | #ifdef DEBUG |
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520 | printf("parsed url : hostname='%s' port=%hu path='%s'\n", hostname, port, path); |
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521 | #endif |
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522 | return miniwget2(hostname, port, path, size, addr, addrlen); |
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523 | } |
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524 | |
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