root / trunk / code / projects / colonet / ColonetClient / Server.cpp @ 13
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/**
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*
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* @author Jason Knichel
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*
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* 2/15/07
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*/
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#include "includes/Server.h" |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <netinet/in.h> |
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#include <unistd.h> |
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#include <netdb.h> |
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#include <stdlib.h> |
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#include "../lib/colonet_defs.h" |
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Server::Server(char * serverAddress, char * port) |
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{ |
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if (!serverAddress)
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{ |
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//TODO: log error message here
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "Server address was null.");
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return;
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} |
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struct hostent * host = gethostbyname(serverAddress);
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if (!host)
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{ |
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//TODO: log error message here
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "Could not look up IP address from server address.");
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return;
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} |
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int portNum = 0; |
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char * endPtr = NULL; |
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portNum = strtol(port, &endPtr, 10);
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if (port[0] == '\0' || *endPtr != '\0') |
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{ |
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//TODO: log error message here
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "\nThe specified port was invalid.\n");
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return;
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} |
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if (portNum < MIN_PORT || portNum > MAX_PORT)
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{ |
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//TODO: log error message here
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "\nThe port must be between %d and %d inclusive.\n", MIN_PORT, MAX_PORT);
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return;
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} |
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//TODO: test this to make sure the string host->h_addr is the 4 byte ip
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// and not a string in dot notation
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int ipAddress = ntohl(atoi(host->h_addr));
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initializeServer(ipAddress, (unsigned short)portNum); |
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} |
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Server::Server (int ipAddress, unsigned short port) |
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{ |
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initializeServer(ipAddress, (unsigned short)port); |
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} |
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int Server::sendMsg(char * message) |
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{ |
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if (!message)
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{ |
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "Message was null when trying to send a message.");
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return ERROR_SERVER_PARAMETER_NULL;
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} |
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if (strlen(message) > MAX_COMMAND_LEN)
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{ |
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "Message was too long.");
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return ERROR_SERVER_MESSAGE_LENGTH;
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} |
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if (serverSocket < 0) |
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{ |
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "The socket was not a valid file descriptor.");
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return ERROR_SERVER_SOCKET;
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} |
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char * sentPoint = message;
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int needToSend = strlen(sentPoint);
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if (sentPoint[needToSend-1] != '\n') |
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{ |
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if (needToSend == MAX_COMMAND_LEN-1) |
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{ |
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "The message was not terminated by a newline and there was no room to add one.");
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return ERROR_NO_NEWLINE;
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} |
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else
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{ |
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sentPoint[needToSend] = '\n';
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sentPoint[needToSend+1] = '\0'; |
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needToSend++; |
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} |
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} |
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while(needToSend > 0) |
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{ |
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int sent = write(serverSocket, sentPoint, needToSend);
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if (sent < 0) |
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{ |
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "There was an error when trying to send the message to the server.");
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return ERROR_SERVER_SENDING;
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} |
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needToSend -= sent; |
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} |
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return 1; |
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} |
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int Server::recvMessagesFromServer()
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{ |
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char message[READ_BUFFER_SIZE];
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int maxCanRead = READ_BUFFER_SIZE - readBufferLength;
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if (maxCanRead > 0) |
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{ |
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fd_set readSet; |
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FD_ZERO(&readSet); |
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FD_SET(serverSocket, &readSet); |
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struct timeval t;
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memset(&t, 0, sizeof(struct timeval)); |
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select (serverSocket+1, &readSet, NULL, NULL, &t); |
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if (!(FD_ISSET(serverSocket, &readSet)))
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{ |
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return 1; |
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} |
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printf("Before read.\n");
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int numRead = read(serverSocket, message, maxCanRead);
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printf("After read.\n");
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if (numRead < 0) |
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{ |
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "There was an error reading from the server.");
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return ERROR_SERVER_READING;
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} |
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memcpy(readBuffer+readBufferLength, message, numRead); |
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readBufferLength += numRead; |
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} |
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return 1; |
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} |
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int Server::getMsg(char * buffer, int bufferLen) |
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{ |
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if (!buffer)
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{ |
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "The buffer given to getMsg was null.");
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return ERROR_SERVER_PARAMETER_NULL;
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} |
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if (bufferLen < 0 || bufferLen > MAX_RESPONSE_LEN) |
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{ |
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "The buffer length given to getMsg was invalid.");
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return ERROR_SERVER_BUFFER_LENGTH;
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} |
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int len = -1; |
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int i;
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for (i = 0; i < readBufferLength; i++) |
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{ |
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if (readBuffer[i] == '\n') |
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{ |
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len = i+1;
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break;
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} |
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} |
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if (len == -1) |
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{ |
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//no message found in buffer
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return 0; |
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} |
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if (len > MAX_RESPONSE_LEN)
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{ |
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//there was a message in the buffer but it was too long
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memmove(readBuffer, readBuffer+len, readBufferLength - len); |
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readBufferLength -= len; |
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "The next message in the buffer was too long. Removing message from buffer.");
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return ERROR_SERVER_MESSAGE_TOO_LONG;
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} |
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if (len > bufferLen)
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{ |
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "The next message is longer than the buffer it is trying to be stored in. Leaving message in queue.");
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return ERROR_SERVER_NOT_ENOUGH_ROOM;
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} |
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//this copies the newline over also into the buffer
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memcpy(buffer, readBuffer, len); |
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memmove(readBuffer, readBuffer+len, readBufferLength - len); |
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readBufferLength -= len; |
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return 1; |
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} |
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int Server::isError()
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{ |
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return error;
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} |
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char * Server::getErrorMsg()
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{ |
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return errorMsg;
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} |
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void Server::clearError()
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{ |
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memset(errorMsg, 0, MAX_ERROR_MSG_LEN);
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error = 0;
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} |
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/******************
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* Private Methods
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*****************/
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//assumes ipAddress and port are in host format
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void Server::initializeServer(int ipAddress, unsigned short port) |
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{ |
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serverSocket = socket(AF_INET, SOCK_STREAM, 0);
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if (serverSocket < 0) |
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{ |
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//TODO: implement logging system and log error message here
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "Could not create a socket.");
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return;
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} |
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struct sockaddr_in addr;
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memset (&addr, 0, sizeof(struct sockaddr_in)); |
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addr.sin_family = AF_INET; |
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addr.sin_addr.s_addr = htonl(ipAddress); |
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addr.sin_port = htons(port); |
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if (connect(serverSocket, (struct sockaddr*)&addr, sizeof(addr)) < 0) |
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{ |
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//TODO: log error message here
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close(serverSocket); |
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error = 1;
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snprintf(errorMsg, MAX_ERROR_MSG_LEN, "Could not connect to server.");
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return;
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} |
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readBufferLength = 0;
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clearError(); |
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} |
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