// Very simple HTTP server // Can parse users requests and send to the client index.html with .css and .js files // Doesn't support any others features of HTTP at that moment, mainly because I don't need it, and don't have enough time:) // But code shows that you can make your HTTP server on C // I'm going to add some new features in code step by step, while I'm learning web development :) #include #include #include #include #include #include #define ANSWER_SIZE 102400 #define CLREQUEST_SIZE 4048 #define MAX_PATH 256 #define WORKFOLDER "C:\\Coding\\C\\ProjectC\\HTTPserver" int socketCreate (void); int bindSocket (int hSocket); void listenSocket (int hSocket); void errorDisplay (char * msg); //make answer to the client request int makeServerAnswer (char**serverAnswer, const char *pathFile); // Parse client request int parseClientRequest (char **clientRequest, char ** pathFile); int main() { struct sockaddr_in client ={0}; char *server_answer = NULL; //Pointer to string for server answer char client_message [CLREQUEST_SIZE] = {'\0'};//String for client request char pathFile [MAX_PATH] = {'\0'};// String for path to the source file( html,css,js and so on) int hSocket =0; // Handler for Server socket char *pPathFile = pathFile, *pClientRequest= client_message; server_answer = (char*)calloc (ANSWER_SIZE, sizeof(char)); //I use dynamic allocating of memory because string is too big for stack if (server_answer == NULL){ char *msg = "\nCan't allocate memory!"; errorDisplay (msg); exit (-4); } hSocket = socketCreate(); bindSocket (hSocket); listenSocket (hSocket); //I have to realize threads in future while (1){ int clientSocket = 0; socklen_t size= 0; clientSocket = accept(hSocket, (struct sockaddr*)&client, &size); if (clientSocket<0){ errorDisplay("Can't accept connection"); } printf("\nConnection with client:%d is created", clientSocket); if (recv(clientSocket,client_message,CLREQUEST_SIZE,0)<0){ errorDisplay("\nCan't receive message"); printf("\nfrom client:%d", clientSocket); } int flag = parseClientRequest (&pClientRequest,&pPathFile); printf ("\nflag:%d", flag); int lenanswer = 0; if ((lenanswer = makeServerAnswer(&server_answer, pPathFile))<0){ char * msg = "\nCan't create answer."; errorDisplay (msg); } if (send (clientSocket,server_answer,(lenanswer*sizeof(char)),0)<0){ errorDisplay("Can't send message"); } close (clientSocket); sleep (0.1); } free (server_answer); return 0; } int socketCreate (void) { int result=0; result = socket (AF_INET,SOCK_STREAM,0); if (result<0){ char *msg ="Can't create socket!"; errorDisplay (msg); exit (-2); } return result; } int bindSocket (int hSocket) { int result =0; struct sockaddr_in server_addr ={0}; server_addr.sin_family = AF_INET; server_addr.sin_port = htons(80); server_addr.sin_addr.s_addr = htonl(INADDR_ANY); result = bind (hSocket, (struct sockaddr *) &server_addr, sizeof (server_addr)); if (result <0) { char *msg ="ERROR Can't bind server!"; errorDisplay (msg); exit (-1); } puts ("\nServer binded!\n"); return 0; } void listenSocket (int hSocket) { int result = 0; result = listen (hSocket,5); if (result<0){ char *msg ="ERROR Can't listen server!"; errorDisplay (msg); exit (-3); } return; } void errorDisplay (char *msg) { perror (msg); } //Parse Client request, takes ** pointer to string request, returns int flag - type of request (1-GET) //zero when not successful int parseClientRequest (char **clientRequest, char ** pathFile) { int result = 0; char workingFolder [] = WORKFOLDER; //working folder char GET[4]="GET"; char POST[5]="POST"; char token[2] =" "; char *pToken =NULL; pToken = strtok (*clientRequest, token); if (strcmp (pToken, GET) == 0){ result= 1; } else if (strcmp (pToken, POST) == 0){ result= 2; } else { puts ("\nClient request doesn't have GET and POST.");// It's for future features } char rootPath [2] ="/";// Indicate that server have to send root index.html //make path to the sourse file (css,js or other) that server has to send to the client pToken = strtok(NULL, token); if (strcmp (pToken,rootPath)== 0){ //If client request '/' server will send index.html strcpy (*pathFile, "index.html"); } else { int len = strlen (pToken); char tempPath [MAX_PATH] = {'\0'}; for (int i=0; i<=len;i++){ // Change '/' that we received from client on '\'. Because server working on windows. if (*pToken == '/'){ *(pToken+i) ='\\'; } } //Concates working Folder with requests of client. It makes right path to the source files that client browser needs strcpy (tempPath, workingFolder); strcat (tempPath,pToken); strcpy (*pathFile,tempPath); } return result; //return flag. It's for future features } //Makes server answer, takes ** pointer to the answer string,int flag == 1 for html answer, ==2 for css answer //Returns leght of answer if successful or -1 if not int makeServerAnswer (char**serverAnswer, const char *pathFile) { char http_header_OK [22] = "HTTP/1.1 200 OK\r\n\n";//HTTP 1.1 header char*pTempString= (char*)calloc (ANSWER_SIZE,sizeof(char)); if (pTempString == NULL){ char *msg = "\nCan't allocate memory!"; errorDisplay (msg); exit (-4); } FILE *sourceFile = NULL; if ((sourceFile = fopen(pathFile, "r"))== NULL){ char *msg = "Can't open file with start page"; errorDisplay (msg); return -1; } printf("\nSource file is opened"); int c =0; strcpy (*serverAnswer,http_header_OK); int i=0; while (c !=EOF){ c = fgetc (sourceFile); *(pTempString +i) = (char)c; i++; } strcat (*serverAnswer, pTempString); int len = strlen (*serverAnswer); if (fclose (sourceFile)!=0){ char *msg ="Can't close source file"; errorDisplay (msg); exit (-2); } free (pTempString); return --len; // Return length-1 of the server answer, we need it for function send(), we really don't need to //return the last symbol == '\0' }

HTTPSimpleServer