Error

/* Verteilte Systeme I Uebungsblatt 4, Aufgabe 2 (HTML-Server) */ #include #include #include #include #include #include #include #include #include #define REL_DIR "./public_html" /* Reply with an Error cli_socket: socket to use errno : Status-Code as specified in RFC 1945 error : Reason-Phrase for human users */ void error(int cli_socket, int errno, char *error) { char buffer[10000]; sprintf(buffer, "HTTP/1.0 %i %s\r\n" \ "Content-Type: text/html\r\n\r\n" \ "Error

HTTP error

%i %s.", errno, error, errno, error); write(cli_socket, buffer, strlen(buffer)); close(cli_socket); exit(0); } int main(int argc, char* argv[]){ int list_socket; int cli_socket; int socklen; int ret; struct sockaddr_in servaddr; struct sockaddr_in cliaddr; char buffer[1024]; char request[1024], filename[1024], version[1024], relFilename[1024]; int port; long len; size_t fileLen; pid_t pid; int inputFile; struct stat fileStatus; FILE *cli_stream; if (argc > 1) { port = atoi(argv[1]); } else port = 2001; printf("Listening on port %d\n", port); list_socket = socket(AF_INET, SOCK_STREAM, 0); if (list_socket == -1) { perror("socket() error"); exit(1); } servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = htonl(INADDR_ANY); servaddr.sin_port = htons(port); ret = bind(list_socket, (struct sockaddr *) &servaddr, sizeof(servaddr)); if (ret == -1) { perror("bind() error"); exit(1); } ret = listen(list_socket, 5); if (ret == -1) { perror("listen() error"); exit(1); } while(1) { socklen = sizeof(cliaddr); cli_socket = accept(list_socket, (struct sockaddr *) &cliaddr, &socklen); if (ret == -1) { perror("accept() error"); exit(1); } pid = fork(); if( pid == 0 ) { /* child process */ close(list_socket); printf("connection from %s, port %d\n", inet_ntoa(cliaddr.sin_addr), ntohs(cliaddr.sin_port)); /* read request */ cli_stream = fdopen(cli_socket,"rb"); fgets(buffer, 1024, cli_stream); /* first line */ sscanf(buffer, "%s %s %s", request, filename, version); printf("Request: %s, File: %s, Version: %s\n", request, filename, version); while( strcmp("\r\n", fgets(buffer, 1024, cli_stream)) != 0) /* ignore everything until an empty line (terminated by \r\n) */ printf("Option: %s", buffer); puts(""); if( strcmp(request,"GET") != 0) error(cli_socket, 400, "Bad Request"); relFilename[0] = '\0'; sprintf(relFilename, REL_DIR "/%s", filename); /* make filename relative */ /* (does not do any security check) */ /* reply request (send file) */ if( (inputFile = open(relFilename, O_RDONLY)) < 0) error(cli_socket, 404, "File not Found"); if( fstat(inputFile, &fileStatus) != 0) error(cli_socket, 500, "Internal Server Error"); fileLen = fileStatus.st_size; sprintf(buffer, "HTTP/1.0 200 OK\r\n" \ "Content-Type: text/html\r\n" \ "Content-Length: %ld\r\n\r\n", fileLen); write(cli_socket, buffer, strlen(buffer)); while( (len=read(inputFile, buffer, 1024)) > 0) { write(cli_socket, buffer, len); } close(inputFile); close(cli_socket); exit(0); } else if(pid > 0) { /* parent */ close(cli_socket); } else { /* error */ perror("fork() error"); } } }