This is a HTTP Server example using the new EthernetInterface and new mbed-rpc libraries.
Dependents: HTTP-RPCServerExample
Fork of HTTPServer by
HTTPConnection.cpp@4:d065642c32cc, 2013-05-28 (annotated)
- Committer:
- leihen
- Date:
- Tue May 28 21:20:58 2013 +0000
- Revision:
- 4:d065642c32cc
- Parent:
- 3:d6224049b3bf
- Child:
- 6:fe661fa9d18a
Added parameter parsing from uri in http webrequest.
; Documentation updated.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
leihen | 0:7a2421e63e74 | 1 | /* HTTPConnection.cpp */ |
leihen | 0:7a2421e63e74 | 2 | |
leihen | 0:7a2421e63e74 | 3 | #include "mbed.h" |
leihen | 0:7a2421e63e74 | 4 | #include "HTTPConnection.h" |
leihen | 0:7a2421e63e74 | 5 | |
leihen | 0:7a2421e63e74 | 6 | #include <vector> |
leihen | 0:7a2421e63e74 | 7 | using std::vector; |
leihen | 0:7a2421e63e74 | 8 | |
leihen | 0:7a2421e63e74 | 9 | using std::string; |
leihen | 0:7a2421e63e74 | 10 | |
leihen | 2:8653bbcf7e58 | 11 | #if (1 && !defined(TARGET_LPC11U24)) |
leihen | 0:7a2421e63e74 | 12 | #define INFO(x, ...) std::printf("[HttpConnection : INFO]"x"\r\n", ##__VA_ARGS__); |
leihen | 0:7a2421e63e74 | 13 | #define WARN(x, ...) std::printf("[HttpConnection : WARN]"x"\r\n", ##__VA_ARGS__); |
leihen | 0:7a2421e63e74 | 14 | #define ERR(x, ...) std::printf("[HttpConnection : ERR]"x"\r\n", ##__VA_ARGS__); |
leihen | 0:7a2421e63e74 | 15 | #else |
leihen | 0:7a2421e63e74 | 16 | #define INFO(x, ...) |
leihen | 0:7a2421e63e74 | 17 | #define WARN(x, ...) |
leihen | 0:7a2421e63e74 | 18 | #define ERR(x, ...) |
leihen | 0:7a2421e63e74 | 19 | #endif |
leihen | 0:7a2421e63e74 | 20 | |
leihen | 0:7a2421e63e74 | 21 | |
leihen | 0:7a2421e63e74 | 22 | |
leihen | 4:d065642c32cc | 23 | const struct HTTPRequestConfig { |
leihen | 4:d065642c32cc | 24 | const char* request_string; |
leihen | 4:d065642c32cc | 25 | HTTPRequestType request_type; |
leihen | 4:d065642c32cc | 26 | } g_requestConfig[] = { |
leihen | 4:d065642c32cc | 27 | { "GET", HTTP_RT_GET }, |
leihen | 4:d065642c32cc | 28 | { "POST", HTTP_RT_POST}, |
leihen | 4:d065642c32cc | 29 | { "PUT", HTTP_RT_PUT}, |
leihen | 4:d065642c32cc | 30 | { "OPTIONS",HTTP_RT_OPTIONS}, |
leihen | 4:d065642c32cc | 31 | { "HEAD", HTTP_RT_HEAD}, |
leihen | 4:d065642c32cc | 32 | { "DELETE", HTTP_RT_DELETE}, |
leihen | 4:d065642c32cc | 33 | { "TRACE", HTTP_RT_TRACE}, |
leihen | 4:d065642c32cc | 34 | { "CONNECT",HTTP_RT_CONNECT} |
leihen | 4:d065642c32cc | 35 | }; |
leihen | 4:d065642c32cc | 36 | |
leihen | 0:7a2421e63e74 | 37 | |
leihen | 0:7a2421e63e74 | 38 | HTTPConnection::HTTPConnection() |
leihen | 0:7a2421e63e74 | 39 | { |
leihen | 0:7a2421e63e74 | 40 | } |
leihen | 0:7a2421e63e74 | 41 | |
leihen | 0:7a2421e63e74 | 42 | |
leihen | 0:7a2421e63e74 | 43 | HTTPConnection::~HTTPConnection() |
leihen | 0:7a2421e63e74 | 44 | { |
leihen | 0:7a2421e63e74 | 45 | close(); |
leihen | 0:7a2421e63e74 | 46 | } |
leihen | 0:7a2421e63e74 | 47 | |
leihen | 0:7a2421e63e74 | 48 | void HTTPConnection::close() |
leihen | 0:7a2421e63e74 | 49 | { |
leihen | 0:7a2421e63e74 | 50 | m_Msg.headers.clear(); |
leihen | 0:7a2421e63e74 | 51 | } |
leihen | 0:7a2421e63e74 | 52 | |
leihen | 0:7a2421e63e74 | 53 | int HTTPConnection::poll() |
leihen | 0:7a2421e63e74 | 54 | { |
leihen | 0:7a2421e63e74 | 55 | static char buffer[256] = {}; |
leihen | 0:7a2421e63e74 | 56 | |
leihen | 0:7a2421e63e74 | 57 | |
leihen | 0:7a2421e63e74 | 58 | int rcvd= 0; |
leihen | 0:7a2421e63e74 | 59 | INFO("[HTTPConnection]Waiting for new data in connection"); |
leihen | 0:7a2421e63e74 | 60 | // Try receiving request line |
leihen | 0:7a2421e63e74 | 61 | rcvd = receiveLine(buffer, 255, 3000); |
leihen | 0:7a2421e63e74 | 62 | if (rcvd == -1) { |
leihen | 0:7a2421e63e74 | 63 | // there was an error, probably the connection was closed, so close this connection as well |
leihen | 0:7a2421e63e74 | 64 | INFO("No more data available. Will close this connection now."); |
leihen | 0:7a2421e63e74 | 65 | close(); |
leihen | 0:7a2421e63e74 | 66 | return -1; |
leihen | 0:7a2421e63e74 | 67 | } |
leihen | 0:7a2421e63e74 | 68 | |
leihen | 0:7a2421e63e74 | 69 | // The Request has not yet been received so try it |
leihen | 0:7a2421e63e74 | 70 | rcvd = parse(buffer); |
leihen | 0:7a2421e63e74 | 71 | if (rcvd == -1) { |
leihen | 0:7a2421e63e74 | 72 | // Invalid content received, so close the connection |
leihen | 0:7a2421e63e74 | 73 | INFO("Invalid message received, so sending negative response and closing connection !"); |
leihen | 2:8653bbcf7e58 | 74 | sprintf(buffer,"HTTP/1.1 400 NOK\n\rContent-Length: %d\n\rContent-Type: text\n\rConnection: Close\n\r\n\r",0); |
leihen | 0:7a2421e63e74 | 75 | m_Tcp.set_blocking(true, 1500); |
leihen | 0:7a2421e63e74 | 76 | m_Tcp.send(buffer,strlen(buffer)); |
leihen | 0:7a2421e63e74 | 77 | close(); |
leihen | 0:7a2421e63e74 | 78 | rcvd = -1; |
leihen | 0:7a2421e63e74 | 79 | return -1; |
leihen | 0:7a2421e63e74 | 80 | } |
leihen | 0:7a2421e63e74 | 81 | // The request has been received, try receive the body |
leihen | 0:7a2421e63e74 | 82 | while(rcvd > 0) { |
leihen | 0:7a2421e63e74 | 83 | rcvd = receiveLine((char*)buffer, 255, 3000); |
leihen | 0:7a2421e63e74 | 84 | // First check if we received an empty line. This would indicate the end of the message or message body. |
leihen | 0:7a2421e63e74 | 85 | if (rcvd < 0) { |
leihen | 0:7a2421e63e74 | 86 | // there was an empty line, so we can start with performing the request |
leihen | 0:7a2421e63e74 | 87 | INFO("Request Header was received completely. Performing request."); |
leihen | 0:7a2421e63e74 | 88 | rcvd = 0; |
leihen | 0:7a2421e63e74 | 89 | break; |
leihen | 0:7a2421e63e74 | 90 | } |
leihen | 0:7a2421e63e74 | 91 | else { |
leihen | 0:7a2421e63e74 | 92 | // add message body |
leihen | 0:7a2421e63e74 | 93 | if (parseHeader(buffer) == 0) { |
leihen | 0:7a2421e63e74 | 94 | } |
leihen | 0:7a2421e63e74 | 95 | else { |
leihen | 0:7a2421e63e74 | 96 | WARN("Invalid message header received !"); |
leihen | 0:7a2421e63e74 | 97 | } |
leihen | 0:7a2421e63e74 | 98 | } |
leihen | 0:7a2421e63e74 | 99 | } |
leihen | 0:7a2421e63e74 | 100 | INFO("Leaving poll function!"); |
leihen | 0:7a2421e63e74 | 101 | return rcvd; |
leihen | 0:7a2421e63e74 | 102 | } |
leihen | 0:7a2421e63e74 | 103 | |
leihen | 0:7a2421e63e74 | 104 | int HTTPConnection::receiveLine(char* szLine, int nMaxLen, int nTimeout, char cLineTerm) |
leihen | 0:7a2421e63e74 | 105 | { |
leihen | 0:7a2421e63e74 | 106 | if ((szLine == NULL) || (nMaxLen == 0)) |
leihen | 0:7a2421e63e74 | 107 | return -1; |
leihen | 0:7a2421e63e74 | 108 | |
leihen | 0:7a2421e63e74 | 109 | m_Tcp.set_blocking(false); |
leihen | 0:7a2421e63e74 | 110 | |
leihen | 0:7a2421e63e74 | 111 | Timer tm; |
leihen | 0:7a2421e63e74 | 112 | int i; |
leihen | 0:7a2421e63e74 | 113 | |
leihen | 0:7a2421e63e74 | 114 | // Try to receive up to the max number of characters |
leihen | 0:7a2421e63e74 | 115 | for (i = 0 ; i < nMaxLen-1 ; i++) { |
leihen | 0:7a2421e63e74 | 116 | int c; |
leihen | 0:7a2421e63e74 | 117 | c = m_Tcp.receive_all( szLine + i, 1 ); |
leihen | 0:7a2421e63e74 | 118 | // Check that - if no character was currently received - the timeout period is reached. |
leihen | 0:7a2421e63e74 | 119 | if ((c == 0) || (c==-1)) { |
leihen | 0:7a2421e63e74 | 120 | // no character was read, so check if operation timed out |
leihen | 0:7a2421e63e74 | 121 | if (tm.read_ms() > nTimeout) { |
leihen | 0:7a2421e63e74 | 122 | // Operation timed out |
leihen | 0:7a2421e63e74 | 123 | INFO("Timeout occured in function 'receiveLine'."); |
leihen | 0:7a2421e63e74 | 124 | return -1; |
leihen | 0:7a2421e63e74 | 125 | } |
leihen | 0:7a2421e63e74 | 126 | } |
leihen | 0:7a2421e63e74 | 127 | |
leihen | 0:7a2421e63e74 | 128 | // Check if line terminating character was received |
leihen | 0:7a2421e63e74 | 129 | if (szLine[i] == cLineTerm) |
leihen | 0:7a2421e63e74 | 130 | break; |
leihen | 0:7a2421e63e74 | 131 | } |
leihen | 0:7a2421e63e74 | 132 | // Terminate with \0 |
leihen | 0:7a2421e63e74 | 133 | szLine[i] = 0; |
leihen | 0:7a2421e63e74 | 134 | |
leihen | 0:7a2421e63e74 | 135 | // Trim for '\r' linefeed at the end |
leihen | 0:7a2421e63e74 | 136 | if( (i >0) && (szLine[i-1] == '\r')) { |
leihen | 0:7a2421e63e74 | 137 | i--; |
leihen | 0:7a2421e63e74 | 138 | szLine[i] = 0; |
leihen | 0:7a2421e63e74 | 139 | } |
leihen | 0:7a2421e63e74 | 140 | INFO("receiveLine : \"%s\".", szLine); |
leihen | 0:7a2421e63e74 | 141 | |
leihen | 0:7a2421e63e74 | 142 | // return number of characters received in the line or return -2 if an empty line was received |
leihen | 0:7a2421e63e74 | 143 | if ((i == 0) || ((i==1) &&(szLine[0] == '\r'))) |
leihen | 0:7a2421e63e74 | 144 | { |
leihen | 0:7a2421e63e74 | 145 | // empty line received, so return -2 |
leihen | 0:7a2421e63e74 | 146 | return -2; |
leihen | 0:7a2421e63e74 | 147 | } |
leihen | 0:7a2421e63e74 | 148 | return i; |
leihen | 0:7a2421e63e74 | 149 | } |
leihen | 0:7a2421e63e74 | 150 | |
leihen | 2:8653bbcf7e58 | 151 | int HTTPConnection::parse(char* buffer) |
leihen | 0:7a2421e63e74 | 152 | { |
leihen | 4:d065642c32cc | 153 | // Check if buffer is invalid or its content not long enough. |
leihen | 0:7a2421e63e74 | 154 | if ((buffer == NULL) || (strlen(buffer) < 4)) { |
leihen | 0:7a2421e63e74 | 155 | ERR("Buffer content is invalid or too short."); |
leihen | 0:7a2421e63e74 | 156 | return -1; |
leihen | 0:7a2421e63e74 | 157 | } |
leihen | 0:7a2421e63e74 | 158 | |
leihen | 4:d065642c32cc | 159 | std::vector<std::string> args; |
leihen | 0:7a2421e63e74 | 160 | args.clear(); |
leihen | 0:7a2421e63e74 | 161 | |
leihen | 4:d065642c32cc | 162 | int argno = 0; |
leihen | 0:7a2421e63e74 | 163 | // decompose string into a list of arguments |
leihen | 0:7a2421e63e74 | 164 | char s = 0; // current starting char |
leihen | 2:8653bbcf7e58 | 165 | int nLen = strlen(buffer)+1; |
leihen | 2:8653bbcf7e58 | 166 | for (int i = 0 ; i < nLen ; i++) { |
leihen | 0:7a2421e63e74 | 167 | if ((buffer[i] == ' ') || (buffer[i] == '\n') || (buffer[i] == 0)) { |
leihen | 0:7a2421e63e74 | 168 | // new arg found |
leihen | 2:8653bbcf7e58 | 169 | buffer[i] = 0; |
leihen | 4:d065642c32cc | 170 | if (argno++ == 1) { |
leihen | 4:d065642c32cc | 171 | // its the uri |
leihen | 4:d065642c32cc | 172 | // parse the uri args |
leihen | 4:d065642c32cc | 173 | parseUriArgs(&buffer[s], m_Msg.args); |
leihen | 4:d065642c32cc | 174 | } |
leihen | 2:8653bbcf7e58 | 175 | INFO("Found argument \"%s\"", &buffer[s]); |
leihen | 2:8653bbcf7e58 | 176 | args.push_back(&buffer[s]); |
leihen | 0:7a2421e63e74 | 177 | s = i+1; |
leihen | 0:7a2421e63e74 | 178 | } |
leihen | 0:7a2421e63e74 | 179 | } |
leihen | 4:d065642c32cc | 180 | |
leihen | 4:d065642c32cc | 181 | // store the uri and the HTTP version |
leihen | 4:d065642c32cc | 182 | m_Msg.uri = args[1]; |
leihen | 4:d065642c32cc | 183 | m_Msg.version = args[2]; |
leihen | 4:d065642c32cc | 184 | |
leihen | 4:d065642c32cc | 185 | // Find matching request type |
leihen | 4:d065642c32cc | 186 | for (int i = 0 ; i < sizeof(g_requestConfig)/sizeof(struct HTTPRequestConfig) ; i++) { |
leihen | 4:d065642c32cc | 187 | if (args.at(0) == g_requestConfig[i].request_string) { |
leihen | 4:d065642c32cc | 188 | m_Msg.request = g_requestConfig[i].request_type; |
leihen | 0:7a2421e63e74 | 189 | } |
leihen | 0:7a2421e63e74 | 190 | } |
leihen | 0:7a2421e63e74 | 191 | args.clear(); |
leihen | 0:7a2421e63e74 | 192 | |
leihen | 0:7a2421e63e74 | 193 | return 1; |
leihen | 0:7a2421e63e74 | 194 | } |
leihen | 0:7a2421e63e74 | 195 | |
leihen | 0:7a2421e63e74 | 196 | |
leihen | 3:d6224049b3bf | 197 | int HTTPConnection::parseHeader(char *buffer) |
leihen | 0:7a2421e63e74 | 198 | { |
leihen | 4:d065642c32cc | 199 | // Check if the buffer is invalid or if the content is too short to be meaningful |
leihen | 0:7a2421e63e74 | 200 | if ((strlen(buffer) <3) || (buffer == NULL)) |
leihen | 0:7a2421e63e74 | 201 | return -1; |
leihen | 0:7a2421e63e74 | 202 | |
leihen | 0:7a2421e63e74 | 203 | // decompose string into a touple of <field name> : <field value> |
leihen | 3:d6224049b3bf | 204 | int value_start = 0; |
leihen | 3:d6224049b3bf | 205 | int buflen = strlen(buffer)+1; |
leihen | 3:d6224049b3bf | 206 | for (int i = 0 ; i < buflen ; i++) { |
leihen | 0:7a2421e63e74 | 207 | if (buffer[i] == ':') { |
leihen | 0:7a2421e63e74 | 208 | // touple found |
leihen | 3:d6224049b3bf | 209 | buffer[i] = 0; |
leihen | 3:d6224049b3bf | 210 | value_start = i+1; |
leihen | 3:d6224049b3bf | 211 | m_Msg.headers[buffer] = &buffer[value_start]; |
leihen | 0:7a2421e63e74 | 212 | |
leihen | 3:d6224049b3bf | 213 | INFO("Header name=\"%s\" : value=\"%s\".", buffer, &buffer[value_start]); |
leihen | 0:7a2421e63e74 | 214 | return 0; |
leihen | 0:7a2421e63e74 | 215 | } |
leihen | 0:7a2421e63e74 | 216 | } |
leihen | 0:7a2421e63e74 | 217 | |
leihen | 0:7a2421e63e74 | 218 | ERR("Did not recieve a valid header : \"%s\".", buffer); |
leihen | 0:7a2421e63e74 | 219 | return -1; |
leihen | 0:7a2421e63e74 | 220 | } |
leihen | 4:d065642c32cc | 221 | |
leihen | 4:d065642c32cc | 222 | int HTTPConnection::parseUriArgs(char *buffer, map<string,string>&args) |
leihen | 4:d065642c32cc | 223 | { |
leihen | 4:d065642c32cc | 224 | // Check if the buffer is invalid or if the content is too short to be meaningful |
leihen | 4:d065642c32cc | 225 | if ((strlen(buffer) <3) || (buffer == NULL)) |
leihen | 4:d065642c32cc | 226 | return -1; |
leihen | 4:d065642c32cc | 227 | |
leihen | 4:d065642c32cc | 228 | int args_start = -1; |
leihen | 4:d065642c32cc | 229 | int value_start = -1; |
leihen | 4:d065642c32cc | 230 | int buflen = strlen(buffer) +1; |
leihen | 4:d065642c32cc | 231 | const char* argname = NULL; |
leihen | 4:d065642c32cc | 232 | const char* valuename = NULL; |
leihen | 4:d065642c32cc | 233 | for (int i = 0; i < buflen ; i++) { |
leihen | 4:d065642c32cc | 234 | if (args_start == -1) { // args section not yet found |
leihen | 4:d065642c32cc | 235 | if (buffer[i] == '?') { // starts with a question mark, so got it |
leihen | 4:d065642c32cc | 236 | buffer[i] = 0; |
leihen | 4:d065642c32cc | 237 | args_start = i; // set the start of the args section |
leihen | 4:d065642c32cc | 238 | INFO("Argument section found !"); |
leihen | 4:d065642c32cc | 239 | } |
leihen | 4:d065642c32cc | 240 | } |
leihen | 4:d065642c32cc | 241 | else { // search arg-value touples |
leihen | 4:d065642c32cc | 242 | if (argname == NULL) { // arg-name found ? |
leihen | 4:d065642c32cc | 243 | if (buffer[i] == '=') { |
leihen | 4:d065642c32cc | 244 | // yes, separate the arg-name |
leihen | 4:d065642c32cc | 245 | buffer[i] = 0; |
leihen | 4:d065642c32cc | 246 | argname = &buffer[args_start]; |
leihen | 4:d065642c32cc | 247 | value_start = i+1; |
leihen | 4:d065642c32cc | 248 | INFO("Argument name %s", argname); |
leihen | 4:d065642c32cc | 249 | } |
leihen | 4:d065642c32cc | 250 | } |
leihen | 4:d065642c32cc | 251 | else { // search for end of value |
leihen | 4:d065642c32cc | 252 | if ((buffer[i] == '&') || (buffer[i] == 0) || (buffer[i] == '\r') || (buffer[i] == '\n')) { |
leihen | 4:d065642c32cc | 253 | buffer[i] = 0; |
leihen | 4:d065642c32cc | 254 | valuename = &buffer[value_start]; |
leihen | 4:d065642c32cc | 255 | INFO("Argument value %s", valuename); |
leihen | 4:d065642c32cc | 256 | args[argname] = valuename; |
leihen | 4:d065642c32cc | 257 | // reset all indicators |
leihen | 4:d065642c32cc | 258 | argname = NULL; |
leihen | 4:d065642c32cc | 259 | valuename = NULL; |
leihen | 4:d065642c32cc | 260 | } |
leihen | 4:d065642c32cc | 261 | } |
leihen | 4:d065642c32cc | 262 | } |
leihen | 4:d065642c32cc | 263 | } |
leihen | 4:d065642c32cc | 264 | |
leihen | 4:d065642c32cc | 265 | return 0; |
leihen | 4:d065642c32cc | 266 | } |