windows版tinyhttpd

单线程，同步阻塞的socket。去掉了cgi的功能，只处理静态文件请求，改了accept_request中的几处bug。

/* J. David's webserver *//* This is a simple webserver. * Created November 1999 by J. David Blackstone. * CSE 4344 (Network concepts), Prof. Zeigler * University of Texas at Arlington *//* This program compiles for Sparc Solaris 2.6. * To compile for Linux: *  1) Comment out the #include <pthread.h> line. *  2) Comment out the line that defines the variable newthread. *  3) Comment out the two lines that run pthread_create(). *  4) Uncomment the line that runs accept_request(). *  5) Remove -lsocket from the Makefile. */#include <WinSock2.h>#include <stdio.h>#include <sys/types.h>#include <ctype.h>#include <string.h>#include <sys/stat.h>#include <stdlib.h>#pragma warning(disable : 4267)#define ISspace(x) isspace((int)(x))#define SERVER_STRING "Server: bdsoftmgr httpd/0.1.0\r\n"void accept_request(SOCKET);void bad_request(int);void cat(SOCKET, FILE *);void cannot_execute(int);void error_die(const char *);void execute_cgi(int, const char *, const char *, const char *);int get_line(SOCKET, char *, int);void headers(SOCKET, const char *);void not_found(SOCKET);void serve_file(SOCKET, const char *);SOCKET startup(u_short *);void unimplemented(SOCKET);void discardheaders(SOCKET);/**********************************************************************//* A request has caused a call to accept() on the server port to * return.  Process the request appropriately. * Parameters: the socket connected to the client *//**********************************************************************/void accept_request(SOCKET client){ char buf[1024]; int numchars; char method[255]; char url[255]; char path[512]; size_t i, j; struct stat st; char *query_string = NULL; numchars = get_line(client, buf, sizeof(buf)); i = 0; j = 0;  while (j < numchars && !ISspace(buf[j]) && (i < sizeof(method) - 1)) {  method[i] = buf[j];  i++; j++; } method[i] = '\0'; if (_stricmp(method, "GET") != 0)// 只处理GET请求 {  if (numchars > 0)  discardheaders(client);    unimplemented(client);  closesocket(client);  return; } i = 0; while (ISspace(buf[j]) && (j < sizeof(buf)))  j++; while (!ISspace(buf[j]) && (i < sizeof(url) - 1) && (j < sizeof(buf))) {  url[i] = buf[j];  i++; j++; } url[i] = '\0'; if (_stricmp(method, "GET") == 0) {  query_string = url;  while ((*query_string != '?') && (*query_string != '\0'))   query_string++;  if (*query_string == '?')  {   *query_string = '\0';   query_string++;  } } sprintf_s(path, 512, "htdocs%s", url); if (path[strlen(path) - 1] == '/')  strcat_s(path, 512, "index.html"); if (stat(path, &st) == -1) {  if (numchars > 0)   discardheaders(client);  not_found(client); } else {  if ((st.st_mode & S_IFMT) == S_IFDIR)   strcat_s(path, 512, "/index.html");  serve_file(client, path); } closesocket(client);}/**********************************************************************//* Inform the client that a request it has made has a problem. * Parameters: client socket *//**********************************************************************/void bad_request(int client){ char buf[1024]; sprintf_s(buf, 1024, "HTTP/1.0 400 BAD REQUEST\r\n"); send(client, buf, sizeof(buf), 0); sprintf_s(buf, 1024, "Content-type: text/html\r\n"); send(client, buf, sizeof(buf), 0); sprintf_s(buf, 1024, "\r\n"); send(client, buf, sizeof(buf), 0); sprintf_s(buf, 1024, "<P>Your browser sent a bad request, "); send(client, buf, sizeof(buf), 0); sprintf_s(buf, 1024, "such as a POST without a Content-Length.\r\n"); send(client, buf, sizeof(buf), 0);}/**********************************************************************//* Put the entire contents of a file out on a socket.  This function * is named after the UNIX "cat" command, because it might have been * easier just to do something like pipe, fork, and exec("cat"). * Parameters: the client socket descriptor *             FILE pointer for the file to cat *//**********************************************************************/void cat(SOCKET client, FILE *resource){ char buf[1024]; fgets(buf, sizeof(buf), resource); while (!feof(resource)) {  send(client, buf, strlen(buf), 0);  fgets(buf, sizeof(buf), resource); }}/**********************************************************************//* Inform the client that a CGI script could not be executed. * Parameter: the client socket descriptor. *//**********************************************************************/void cannot_execute(int client){ char buf[1024]; sprintf_s(buf, 1024, "HTTP/1.0 500 Internal Server Error\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "Content-type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "<P>Error prohibited CGI execution.\r\n"); send(client, buf, strlen(buf), 0);}/**********************************************************************//* Print out an error message with perror() (for system errors; based * on value of errno, which indicates system call errors) and exit the * program indicating an error. *//**********************************************************************/void error_die(const char *sc){ perror(sc); exit(1);}/**********************************************************************//* Get a line from a socket, whether the line ends in a newline, * carriage return, or a CRLF combination.  Terminates the string read * with a null character.  If no newline indicator is found before the * end of the buffer, the string is terminated with a null.  If any of * the above three line terminators is read, the last character of the * string will be a linefeed and the string will be terminated with a * null character. * Parameters: the socket descriptor *             the buffer to save the data in *             the size of the buffer * Returns: the number of bytes stored (excluding null) *//**********************************************************************/int get_line(SOCKET sock, char *buf, int size){ int i = 0; char c = '\0'; int n; while ((i < size - 1) && (c != '\n')) {  n = recv(sock, &c, 1, 0);  /* DEBUG printf("%02X\n", c); */  if (n > 0)  {   if (c == '\r')   {    n = recv(sock, &c, 1, MSG_PEEK);    /* DEBUG printf("%02X\n", c); */    if ((n > 0) && (c == '\n'))     recv(sock, &c, 1, 0);    else     c = '\n';   }   buf[i] = c;   i++;  }  else   c = '\n'; } buf[i] = '\0';  return(i);}/**********************************************************************//* Return the informational HTTP headers about a file. *//* Parameters: the socket to print the headers on *             the name of the file *//**********************************************************************/void headers(SOCKET client, const char *filename){ char buf[1024]; (void)filename;  /* could use filename to determine file type */ strcpy_s(buf, 1024, "HTTP/1.0 200 OK\r\n"); send(client, buf, strlen(buf), 0); strcpy_s(buf, 1024, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "Content-Type: text/html\r\n"); send(client, buf, strlen(buf), 0); strcpy_s(buf, 1024, "\r\n"); send(client, buf, strlen(buf), 0);}/**********************************************************************//* Give a client a 404 not found status message. *//**********************************************************************/void not_found(SOCKET client){ char buf[1024]; sprintf_s(buf, 1024, "HTTP/1.0 404 NOT FOUND\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "Content-Type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "<HTML><TITLE>Not Found</TITLE>\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "<BODY><P>The server could not fulfill\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "your request because the resource specified\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "is unavailable or nonexistent.\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "</BODY></HTML>\r\n"); send(client, buf, strlen(buf), 0);}/**********************************************************************//* Send a regular file to the client.  Use headers, and report * errors to client if they occur. * Parameters: a pointer to a file structure produced from the socket *              file descriptor *             the name of the file to serve *//**********************************************************************/void serve_file(SOCKET client, const char *filename){ FILE *resource = NULL; char buf[1024]; discardheaders(client); fopen_s(&resource, filename, "r"); if (resource == NULL)  not_found(client); else {  headers(client, filename);  cat(client, resource); } fclose(resource);}/**********************************************************************//* Send a regular file to the client.  Use headers, and report * errors to client if they occur. * Parameters: a pointer to a file structure produced from the socket *              file descriptor *             the name of the file to serve *//**********************************************************************/void discardheaders(SOCKET client){char buf[1024];int numchars = 1;while ((numchars > 0) && strcmp("\n", buf))  /* read & discard headers */numchars = get_line(client, buf, sizeof(buf));}/**********************************************************************//* This function starts the process of listening for web connections * on a specified port.  If the port is 0, then dynamically allocate a * port and modify the original port variable to reflect the actual * port. * Parameters: pointer to variable containing the port to connect on * Returns: the socket *//**********************************************************************/SOCKET startup(u_short *port){ SOCKET httpd = 0; struct sockaddr_in name; httpd = socket(AF_INET, SOCK_STREAM, 0); if (httpd == INVALID_SOCKET)  error_die("socket"); memset(&name, 0, sizeof(name)); name.sin_family = AF_INET; name.sin_port = htons(*port); name.sin_addr.s_addr = inet_addr("127.0.0.1"); if (bind(httpd, (struct sockaddr *)&name, sizeof(name)) < 0)  error_die("bind"); if (*port == 0)  /* if dynamically allocating a port */ {  int namelen = sizeof(name);  if (getsockname(httpd, (struct sockaddr *)&name, &namelen) == -1)   error_die("getsockname");  *port = ntohs(name.sin_port); } if (listen(httpd, 5) < 0)  error_die("listen"); return(httpd);}/**********************************************************************//* Inform the client that the requested web method has not been * implemented. * Parameter: the client socket *//**********************************************************************/void unimplemented(SOCKET client){ char buf[1024]; sprintf_s(buf, 1024, "HTTP/1.0 501 Method Not Implemented\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "Content-Type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "<HTML><HEAD><TITLE>Method Not Implemented\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "</TITLE></HEAD>\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "<BODY><P>HTTP request method not supported.\r\n"); send(client, buf, strlen(buf), 0); sprintf_s(buf, 1024, "</BODY></HTML>\r\n"); send(client, buf, strlen(buf), 0);}/**********************************************************************/int main(void){ SOCKET server_sock = INVALID_SOCKET; u_short port = 0; SOCKET client_sock = -1; struct sockaddr_in client_name; int client_name_len = sizeof(client_name); // 初始化socket WSADATA wsaData; WSAStartup(MAKEWORD(2,2), &wsaData); server_sock = startup(&port); printf("httpd running on port %d\n", port); while (1) {  client_sock = accept(server_sock,                       (struct sockaddr *)&client_name,                       &client_name_len);  if (client_sock == INVALID_SOCKET)   error_die("accept");  accept_request(client_sock);// 单线程模式 } closesocket(server_sock); WSACleanup(); return(0);}