利用http协议实现一个简单的web服务器

来源：互联网发布：js点击事件编辑：程序博客网时间：2024/06/05 21:00

目录文件：

htdoc：

html文件：

<html><head>        <h1>hello</h1>   </head>     <body>        <p>hello fucang</p>        <img src = "fucang.jpg" height = "413" width = "295"/>    </body></html>

Makefile：

BIN=my_httpdSRC=httpd.cOBJ=$(SRC:.c=.o)CC=gccLDFLAGS=-lpthread$(BIN):$(OBJ)$(CC) -o $@ $^ $(LDFLAGS)%.o:%.c$(CC) -c $<.PHONY:cleanclean:rm -f $(OBJ) $(BIN).PHONY:debugdebug:@echo $(SRC)@echo $(OBJ)

源程序：

/*************************************************************************> File Name: httpd.c> Author: fucang_zxx> Mail: fucang_zxx@163.com > Created Time: Wed 03 Aug 2016 08:29:42 PM CST ************************************************************************/#include <stdio.h>#include <stdlib.h>#include <string.h>#include <pthread.h>#include <unistd.h>#include <fcntl.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <sys/sendfile.h>#include <sys/stat.h>#include <arpa/inet.h>#define _SIZE_ 1024static void echo_errno(int sock){//}int statup(char *_ip, int _port){int sock = socket(AF_INET, SOCK_STREAM, 0);if(sock < 0){perror("socket");exit(3);}int opt = 1;//消除2倍的MSL时间    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));struct sockaddr_in local;local.sin_family = AF_INET;local.sin_port = htons(_port);local.sin_addr.s_addr = inet_addr(_ip);if(bind(sock, (struct sockaddr*)&local, sizeof(local)) < 0){perror("bind");exit(4);}if(listen(sock, 5) < 0){perror("listen");exit(5);}return sock;}static int get_line(int sock, char buf[], int len){if( buf == NULL || len < 0){return -1;}char c = '\0';//注意要初始化int n = 0;int i = 0;while( (i < len - 1) && (c != '\n') )//读到空行为止{n = recv(sock, &c, 1, 0);  //从客户端接收消息if(n > 0)//读取成功{//将\r \n \r\n全转化为\nif(c == '\r'){n = recv(sock, &c, 1, MSG_PEEK); //向前看一个字符，但实际没有读过去if(n > 0 && c == '\n'){recv(sock, &c, 1, 0);//确认是\n，读过去}c = '\n';}        buf[i++] = c;}else{c = '\n'; //读取失败，直接结束}}buf[i] = '\0';//printf("get_line buf = %s\n", buf);return i;}static void clear_header(int sock){int ret = 1;char buf[_SIZE_];do{ret = get_line(sock, buf, sizeof(buf));}while((ret > 0) && (strcmp(buf, "\n") != 0));}void echo_www(int sock, const char* path, int size){//printf("echo HTMLFFFFFFFFFFFFFFFFFFFFFFFF\n");int fd = open(path, O_RDONLY);if(fd < 0){echo_errno(sock);return;}//printf("sever path : %s\n", path);  path = htdoc/1.jpgchar buf[_SIZE_];sprintf(buf, "HTTP/1.0 200 OK\r\n\r\n");send(sock, buf, strlen(buf), 0);if(sendfile(sock, fd, NULL, size) < 0){echo_errno(sock);close(fd);return;}close(fd);}void* accept_request(void *arg){int sock = (int)arg;char buf[_SIZE_];char method[_SIZE_]; //存放方法名即GET or POSTchar url[_SIZE_]; //存放路径char path[_SIZE_];memset(buf, '\0', sizeof(buf));memset(method, '\0', sizeof(method));memset(url, '\0', sizeof(url));memset(path, '\0', sizeof(path));int cgi = 0;int ret = -1;char *query_string = NULL; //保存数据参数#ifdef _DEBUG_do{//http的请求报时按行存储ret = get_line(sock, buf, sizeof(buf));//获取消息报的一行printf("%s", buf);fflush(stdout);}while((ret > 0) && strcmp(buf, "\n") != 0);  //读取到空行#endif /*_DEBUG*/ret = get_line(sock, buf, sizeof(buf)); //获取请求行//printf("buf = %s\n", buf);if(ret < 0){echo_errno(sock);return (void*)1;}//GET   / HTTP/1.1int i = 0; //method indexint j = 0; //buf index//请求行包括 方法 url http/1.1(0)////获取方法 GET POSTwhile( (i < sizeof(method) - 1) && (j < sizeof(buf)) && (!isspace(buf[j]))){method[i] = buf[j];++i;++j;}method[i] = '\0';//strcasecmp比较时不考虑大小写，if(strcasecmp(method, "GET") != 0 && strcasecmp(method, "POST") != 0){echo_errno(sock);return (void*)2;}//printf("method = %s\n", method);//如果以GET方式传输，所带参数附加在CGI程式的URL后直接传给server，并可从server端的//QUERY_STRING这个环境变量中获取//如果以POST方式传输，则参数会被打包在数据报中传送给server，并可从CONTENT_LENGTH这//个环境变量中读取//理论上讲，GET是从服务器上请求数据，POST是发送数据到服务器//GET方法是把数据参数队列(query string)加到一个URL上，GET方法通常会限制字符的大小//POST方法可以没有时间限制的传送数据到服务器，用户在浏览器端是看不到这一过程的，//所以POST方法比较适合用于发送一个保密的或者比较大量的数据到服务器if(strcasecmp(method, "POST") == 0){cgi = 1;}//跳过空格while(isspace(buf[j])){++j;}//获取urli = 0;while( (i < sizeof(url) - 1) && (j < sizeof(buf)) && (!isspace(buf[j]))){url[i] = buf[j];++i;++j;}if(strcasecmp(method, "GET") == 0){query_string = url;//路径和数据参数以 ？分隔while(*query_string != '\0' && *query_string != '?'){++query_string;}if(*query_string == '?'){cgi = 1;*query_string++ = '\0';}}// / /aa/bb/ccsprintf(path, "htdoc%s", url);if(path[strlen(path) -1] == '/'){strcat(path, "index.html");}//printf("method : %s\n", method);//printf("path: %s\n", path);//printf("query_string: %s\n", query_string);struct stat st;if(stat(path, &st) < 0){echo_errno(sock);return (void*)3;}else {if(S_ISDIR(st.st_mode)){strcpy(path, "htdoc/index.html");}else if((st.st_mode & S_IXUSR) || \(st.st_mode & S_IXGRP) || \(st.st_mode & S_IXOTH)){cgi = 1;}else{}if(cgi){//exec_cgi(sock, path, method, query_string);}else{clear_header(sock);echo_www(sock, path,st.st_size);}}close(sock);return (void*)0;}int main(int argc, char* argv[]){    if(argc != 3){printf("Usage#: %s [ip] [port]\n", argv[0]);exit(1);}int listen_sock = statup(argv[1], atoi(argv[2]));struct sockaddr_in peer;socklen_t len = sizeof(peer);int done = 0;while(!done){int new_sock = accept(listen_sock, (struct sockaddr*)&peer, &len);if(new_sock < 0){perror("accept");exit(2);}printf("debug : client socket: %s:%d\n", inet_ntoa(peer.sin_addr), ntohs(peer.sin_port));pthread_t tid;pthread_create(&tid, NULL, accept_request, (void*)new_sock);pthread_detach(tid);}return 0;}

运行截图：

1 0