mirror of
https://github.com/fumiama/simple-http-server.git
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525 lines
18 KiB
C
525 lines
18 KiB
C
/* J. David's webserver */
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/* This is a simple webserver.
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* Created November 1999 by J. David Blackstone.
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* CSE 4344(Network concepts), Prof. Zeigler
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* University of Texas at Arlington
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*
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* Modified June 2021 by Fumiama(源文雨)
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*/
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/* See feature_test_macros(7) */
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#define _GNU_SOURCE 1
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <netinet/in.h>
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#include <pthread.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/file.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#if !__APPLE__
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#include <sys/sendfile.h>
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#else
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static struct sf_hdtr hdtr;
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#endif
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#define ISspace(x) isspace((int)(x))
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#define SERVER_STRING "Server: TinyHttpd modified by Fumiama/1.0\r\n"
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enum METHOD_TYPE {GET, POST};
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typedef enum METHOD_TYPE METHOD_TYPE;
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struct HTTP_REQUEST {
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const char *path;
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const char *method;
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METHOD_TYPE method_type;
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const char *query_string;
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};
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typedef struct HTTP_REQUEST HTTP_REQUEST;
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static void accept_request(void *);
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static void bad_request(int);
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static void cat(int, FILE *);
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static void cannot_execute(int);
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static void error_die(const char *);
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static void execute_cgi(int, int, const HTTP_REQUEST*);
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static uint32_t get_file_size(const char *, int);
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static int get_line(int, char *, int);
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static void handle_quit(int);
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static void headers(int, const char *);
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static void not_found(int);
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static void serve_file(int, const char *);
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static int startup(u_int16_t *);
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static void unimplemented(int);
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/**********************************************************************/
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/* A request has caused a call to accept() on the server port to
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* return. Process the request appropriately.
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* Parameters: the socket connected to the client */
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/**********************************************************************/
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static void accept_request(void *cli) {
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pthread_detach(pthread_self());
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int client =(int)cli;
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char buf[1024];
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int numchars;
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char method[255];
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char url[255];
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char path[512];
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size_t i, j;
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struct stat st;
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int cgi = 0; /* becomes true if server decides this is a CGI program */
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char *query_string = NULL;
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METHOD_TYPE method_type;
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numchars = get_line(client, buf, sizeof(buf));
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i = 0;
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j = 0;
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while(!ISspace(buf[j]) &&(i < sizeof(method) - 1)) {
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method[i] = buf[j];
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i++;
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j++;
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}
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method[i] = '\0';
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if(strcasecmp(method, "GET") == 0) {
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method_type = GET;
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}
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if(strcasecmp(method, "POST") == 0) {
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if(method_type == GET) {
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unimplemented(client);
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return;
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} else {
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cgi = 1;
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method_type = POST;
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}
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}
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i = 0;
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while(ISspace(buf[j]) &&(j < sizeof(buf))) j++;
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while(!ISspace(buf[j]) &&(i < sizeof(url) - 1) &&(j < sizeof(buf))) {
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url[i] = buf[j];
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i++;
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j++;
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}
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url[i] = '\0';
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if(method_type == GET) {
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query_string = url;
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while((*query_string != '?') &&(*query_string != '\0')) query_string++;
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if(*query_string == '?') {
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cgi = 1;
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*query_string = '\0';
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query_string++;
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}
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}
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char* url_start = url + 1;
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//skip possible ../
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while((*url_start == '.' || *url_start == '/' || *url_start == '#') && *url_start != 0) url_start++;
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path[0] = '.'; path[1] = '/'; path[2] = 0;
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if(*url_start) strncat(path, url_start, 499);
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printf("%s: %s with query: %s\n", method, path, query_string);
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if(stat(path, &st) == -1) {
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/* read & discard headers */
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while((numchars > 0) && strcmp("\n", buf)) numchars = get_line(client, buf, sizeof(buf));
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not_found(client);
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} else {
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if((st.st_mode & S_IFMT) == S_IFDIR) strcat(path, "/index.html");
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else if((st.st_mode & S_IXUSR) ||(st.st_mode & S_IXGRP) ||(st.st_mode & S_IXOTH)) cgi = 1;
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/* read & discard headers */
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int content_length = 0;
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while((numchars > 0) && strcmp("\n", buf)) {
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numchars = get_line(client, buf, sizeof(buf));
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if(!content_length && strcasestr(buf, "Content-Length: ")) {
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content_length = atoi(buf + 16);
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}
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}
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if(method_type == POST && content_length == -1) bad_request(client);
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else if(!cgi) serve_file(client, path);
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else {
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HTTP_REQUEST request;
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request.path = path;
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request.method = method;
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request.method_type = method_type;
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request.query_string = query_string;
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execute_cgi(client, content_length, &request);
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}
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}
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close(client);
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}
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/**********************************************************************/
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/* Inform the client that a request it has made has a problem.
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* Parameters: client socket */
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/**********************************************************************/
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#define HTTP400 "HTTP/1.0 400 BAD REQUEST\r\nContent-Type: text/html\r\n\r\n<P>Your browser sent a bad request, such as a POST without a Content-Length.\r\n"
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static void bad_request(int client) {
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send(client, HTTP400, sizeof(HTTP400)-1, 0);
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}
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/**********************************************************************/
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/* Put the entire contents of a file out on a socket. This function
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* is named after the UNIX "cat" command, because it might have been
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* easier just to do something like pipe, fork, and exec("cat").
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* Parameters: the client socket descriptor
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* FILE pointer for the file to cat */
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/**********************************************************************/
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static void cat(int client, FILE *resource) {
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off_t len = 0;
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#if __APPLE__
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sendfile(fileno(resource), client, 0, &len, &hdtr, 0);
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#else
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fseek(resource, 0, SEEK_END);
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off_t file_size = ftell(resource);
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rewind(resource);
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sendfile(client, fileno(resource), &len, file_size);
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#endif
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printf("Send %lu bytes.\n", len);
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}
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/**********************************************************************/
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/* Inform the client that a CGI script could not be executed.
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* Parameter: the client socket descriptor. */
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/**********************************************************************/
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#define HTTP500 "HTTP/1.0 500 Internal Server Error\r\nContent-Type: text/html\r\n\r\n<P>Internal Server Error.\r\n"
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static void cannot_execute(int client) {
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send(client, HTTP500, sizeof(HTTP500)-1, 0);
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}
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/**********************************************************************/
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/* Print out an error message with perror()(for system errors; based
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* on value of errno, which indicates system call errors) and exit the
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* program indicating an error. */
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/**********************************************************************/
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static void error_die(const char *sc) {
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perror(sc);
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exit(1);
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}
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/**********************************************************************/
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/* Execute a CGI script. Will need to set environment variables as
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* appropriate.
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* Parameters: client socket descriptor
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* path to the CGI script */
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/**********************************************************************/
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static void execute_cgi(int client, int content_length, const HTTP_REQUEST* request) {
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int cgi_output[2];
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int cgi_input[2];
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pid_t pid;
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int i;
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if(pipe(cgi_output) < 0 || pipe(cgi_input) < 0 ||(pid = fork()) < 0) cannot_execute(client);
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/* child: CGI script */
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else if(pid == 0) {
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char env[255];
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dup2(cgi_output[1], 1);
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dup2(cgi_input[0], 0);
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close(cgi_output[0]);
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close(cgi_input[1]);
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sprintf(env, "REQUEST_METHOD=%s", request->method);
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putenv(env);
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if(request->method_type == GET) {
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sprintf(env, "QUERY_STRING=%s", request->query_string);
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putenv(env);
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}
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else { /* POST */
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sprintf(env, "CONTENT_LENGTH=%d", content_length);
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putenv(env);
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}
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execl(request->path, request->path, request->method, request->query_string, NULL);
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exit(0);
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}
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else { /* parent */
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char buf[1024];
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close(cgi_output[1]);
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close(cgi_input[0]);
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if(request->method_type == POST) {
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#if __APPLE__
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for(i = 0; i < content_length;) {
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int cnt = recv(client, buf, 1024, 0);
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if(cnt > 0) {
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write(cgi_input[1], buf, cnt);
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i += cnt;
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}
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}
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#else
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int len = 0;
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while(len < content_length) {
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int delta = splice(client, NULL, cgi_input[1], NULL, content_length - len, SPLICE_F_GIFT);
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if(delta < 0) {
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cannot_execute(client);
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break;
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}
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len += delta;
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}
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#endif
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}
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uint32_t cnt = 0;
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char* p =(char*)&cnt;
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while(p -(char*)&cnt < sizeof(uint32_t)) {
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int offset = read(cgi_output[0], p, sizeof(uint32_t));
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if(offset > 0) p += offset;
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else cannot_execute(client);
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}
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printf("cgi msg cnt: %u bytes.\n", cnt);
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if(cnt > 0) {
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int len = 0;
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#if __APPLE__
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char* data = malloc(cnt);
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while(len < cnt) {
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len += read(cgi_output[0], data, cnt);
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send(client, data, len, 0);
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}
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if(data) free(data);
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#else
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while(len < cnt) {
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int delta = splice(cgi_output[0], NULL, client, NULL, cnt - len, SPLICE_F_GIFT);
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if(delta < 0) {
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cannot_execute(client);
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break;
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}
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len += delta;
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}
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#endif
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printf("cgi send %d bytes\n", len);
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}
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close(cgi_output[0]);
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close(cgi_input[1]);
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waitpid(pid, &i, 0);
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}
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}
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/**********************************************************************/
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/* Returns the size of a file. */
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/* Parameters: path of the file */
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/**********************************************************************/
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static uint32_t get_file_size(const char *filepath, int client) {
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struct stat statbuf;
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uint32_t sz;
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if(!stat(filepath, &statbuf)) {
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sz = statbuf.st_size;
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printf("file size: %u\n", sz);
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return sz;
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}
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else {
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cannot_execute(client);
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error_die("stat");
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}
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}
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/**********************************************************************/
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/* Get a line from a socket, whether the line ends in a newline,
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* carriage return, or a CRLF combination. Terminates the string read
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* with a null character. If no newline indicator is found before the
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* end of the buffer, the string is terminated with a null. If any of
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* the above three line terminators is read, the last character of the
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* string will be a linefeed and the string will be terminated with a
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* null character.
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* Parameters: the socket descriptor
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* the buffer to save the data in
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* the size of the buffer
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* Returns: the number of bytes stored(excluding null) */
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/**********************************************************************/
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static int get_line(int sock, char *buf, int size) {
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int i = 0;
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char c = '\0';
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int n;
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while((i < size - 1) &&(c != '\n')) {
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n = recv(sock, &c, 1, 0);
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/* DEBUG printf("%02X\n", c); */
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if(n > 0) {
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if(c == '\r') {
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n = recv(sock, &c, 1, MSG_PEEK);
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/* DEBUG printf("%02X\n", c); */
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if((n > 0) &&(c == '\n'))
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recv(sock, &c, 1, 0);
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else c = '\n';
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}
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buf[i] = c;
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i++;
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}
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else c = '\n';
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}
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buf[i] = '\0';
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return(i);
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}
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/**********************************************************************/
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/* Handle thread quit signal
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/**********************************************************************/
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static void handle_quit(int signo) {
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perror("handle");
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pthread_exit(NULL);
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}
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/**********************************************************************/
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/* Return the informational HTTP headers about a file. */
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/* Parameters: the socket to print the headers on
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* the name of the file */
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/**********************************************************************/
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#define ADD_HERDER(h)\
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strcpy(buf + offset, h);\
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offset += sizeof(h) - 1;
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#define ADD_HERDER_PARAM(h, p)\
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sprintf(buf + offset, h,(p));\
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offset += strlen(buf + offset);
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#define EXTNM_IS_NOT(name)(strcmp(filepath+extpos, name))
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#define HTTP200 "HTTP/1.0 200 OK\r\n"
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#define CONTENT_TYPE "Content-Type: %s\r\n"
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#define CONTENT_LEN "Content-Length: %d\r\n"
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static void headers(int client, const char *filepath) {
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char buf[1024];
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uint32_t offset = 0;
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uint32_t extpos = strlen(filepath) - 4;
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ADD_HERDER(HTTP200 SERVER_STRING);
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ADD_HERDER_PARAM(CONTENT_TYPE, EXTNM_IS_NOT("html")?(EXTNM_IS_NOT(".css")?(EXTNM_IS_NOT(".ico")?"text/plain":"image/x-icon"):"text/css"):"text/html");
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ADD_HERDER_PARAM(CONTENT_LEN "\r\n", get_file_size(filepath, client));
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send(client, buf, offset, 0);
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}
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/**********************************************************************/
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/* Give a client a 404 not found status message. */
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/**********************************************************************/
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#define HTTP404 "HTTP/1.0 404 NOT FOUND\r\n" SERVER_STRING "Content-Type: text/html\r\n\r\n<HTML><TITLE>Not Found</TITLE>\r\n<BODY><P>The server could not fulfill\r\nyour request because the resource specified\r\nis unavailable or nonexistent.\r\n</BODY></HTML>\r\n"
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static void not_found(int client) {
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send(client, HTTP404, sizeof(HTTP404)-1, 0);
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}
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/**********************************************************************/
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/* Send a regular file to the client. Use headers, and report
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* errors to client if they occur.
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* Parameters: a pointer to a file structure produced from the socket
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* file descriptor
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* the name of the file to serve */
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/**********************************************************************/
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static void serve_file(int client, const char *filename) {
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FILE *resource = NULL;
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resource = fopen(filename, "rb");
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if(resource == NULL) not_found(client);
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else {
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headers(client, filename);
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cat(client, resource);
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}
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fclose(resource);
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}
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/**********************************************************************/
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/* This function starts the process of listening for web connections
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* on a specified port. If the port is 0, then dynamically allocate a
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* port and modify the original port variable to reflect the actual
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* port.
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* Parameters: pointer to variable containing the port to connect on
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* Returns: the socket */
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/**********************************************************************/
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#ifdef LISTEN_ON_IPV6
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static socklen_t struct_len = sizeof(struct sockaddr_in6);
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static struct sockaddr_in6 name;
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#else
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static socklen_t struct_len = sizeof(struct sockaddr_in);
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static struct sockaddr_in name;
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#endif
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static int startup(uint16_t *port) {
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int httpd = 0;
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#ifdef LISTEN_ON_IPV6
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name.sin6_family = AF_INET6;
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name.sin6_port = htons(*port);
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bzero(&(name.sin6_addr), sizeof(name.sin6_addr));
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httpd = socket(PF_INET6, SOCK_STREAM, 0);
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#else
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name.sin_family = AF_INET;
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name.sin_port = htons(*port);
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name.sin_addr.s_addr = INADDR_ANY;
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bzero(&(name.sin_zero), 8);
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httpd = socket(AF_INET, SOCK_STREAM, 0);
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#endif
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if(httpd == -1) error_die("socket");
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if(bind(httpd,(struct sockaddr *)&name, struct_len) < 0) error_die("bind");
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/* if dynamically allocating a port */
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if(*port == 0) {
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if(getsockname(httpd,(struct sockaddr *)&name, &struct_len) == -1) error_die("getsockname");
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#ifdef LISTEN_ON_IPV6
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*port = ntohs(name.sin6_port);
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#else
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*port = ntohs(name.sin_port);
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#endif
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}
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if(listen(httpd, 5) < 0) error_die("listen");
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return(httpd);
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}
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/**********************************************************************/
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/* Inform the client that the requested web method has not been
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* implemented.
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* Parameter: the client socket */
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/**********************************************************************/
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#define HTTP501 "HTTP/1.0 501 Method Not Implemented\r\n" SERVER_STRING "Content-Type: text/html\r\n\r\n<HTML><HEAD><TITLE>Method Not Implemented\r\n</TITLE></HEAD>\r\n<BODY><P>HTTP request method not supported.\r\n</BODY></HTML>\r\n"
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static void unimplemented(int client) {
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send(client, HTTP501, sizeof(HTTP501)-1, 0);
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}
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/**********************************************************************/
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/* simple-http-server
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* Usage: simple-http-server -d port chdir
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/**********************************************************************/
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#define ACCEPT_CLI() {\
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while(1) {\
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client_sock = accept(server_sock,(struct sockaddr *)&client_name, &client_name_len);\
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if(client_sock == -1) break;\
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signal(SIGQUIT, handle_quit);\
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signal(SIGPIPE, handle_quit);\
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if(pthread_create(&newthread, NULL, accept_request, client_sock) != 0) perror("pthread_create");\
|
|
}\
|
|
close(client_sock);\
|
|
error_die("accept");\
|
|
}
|
|
|
|
int main(int argc, char **argv) {
|
|
if(argc != 3 && argc != 4) puts("Usage: simple-http-server -d port chdir");
|
|
else {
|
|
int as_daemon = *(uint16_t*)argv[1] == *(uint16_t*)"-d";
|
|
int server_sock = -1;
|
|
uint16_t port =(uint16_t)atoi(argv[as_daemon?2:1]);
|
|
int client_sock = -1;
|
|
int pid = -1;
|
|
struct sockaddr_in client_name;
|
|
socklen_t client_name_len = sizeof(client_name);
|
|
pthread_t newthread;
|
|
|
|
char *cdir = argv[as_daemon?3:2];
|
|
if(chdir(cdir)) error_die("chdir");
|
|
server_sock = startup(&port);
|
|
printf("httpd running on port %d\n", port);
|
|
if(as_daemon) {
|
|
pid = fork();
|
|
if(pid == 0) pid = fork();
|
|
else return 0;
|
|
while(pid > 0) { //主进程监控子进程状态，如果子进程异常终止则重启之
|
|
wait(NULL);
|
|
puts("Server subprocess exited. Restart...");
|
|
pid = fork();
|
|
}
|
|
if(pid < 0) perror("fork");
|
|
else ACCEPT_CLI();
|
|
} else ACCEPT_CLI();
|
|
}
|
|
}
|