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📄 das-server.c

📁 简单的Linux 服务器的Demo代码
💻 C
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#include <stdarg.h>#include <errno.h>#include <stdio.h>#include <fcntl.h>#include <unistd.h>#include <string.h>#include <time.h>#include <sys/types.h>#include <sys/stat.h>#include <dirent.h>#include <errno.h>#include <netinet/in.h>#include <sys/socket.h>#include <resolv.h>#include <arpa/inet.h>#include <stdlib.h>#include <signal.h>#include <getopt.h>#define DEFAULTIP "172.16.65.119"#define DEFAULTPORT "80"#define DEFAULTBACK "10"#define DEFAULTDIR "/home/yangzq"#define DEFAULTLOG "/tmp/das-server.log"void prterrmsg(char *msg);#define prterrmsg(msg) { perror(msg); abort(); }void wrterrmsg(char *msg);#define wrterrmsg(msg) { fputs(msg, logfp); fputs(strerror(errno), logfp);fflush(logfp); abort(); }void prtinfomsg(char *msg);#define prtinfomsg(msg) { fputs(msg, stdout); }void wrtinfomsg(char *msg);#define wrtinfomsg(msg) { fputs(msg, logfp); fflush(logfp);}#define MAXBUF 1024*2char buffer[MAXBUF + 1];char *host = 0;char *port = 0;char *back = 0;char *dirroot = 0;char *logdir = 0;unsigned char daemon_y_n = 0;FILE *logfp;#define MAXPATH 150/*----------------------------------------*--- dir_up - 查找dirpath所指目录的上一级目录*----------------------------------------*/char *dir_up(char *dirpath){	static char Path[MAXPATH];	int len;	strcpy(Path, dirpath);	len = strlen(Path);	if (len > 1 && Path[len - 1] == '/')		len--;	while (Path[len - 1] != '/' && len > 1)		len--;	Path[len] = 0;		return Path;}/*------------------------------------------------------*--- AllocateMemory - 分配空间并把d所指的内容复制*------------------------------------------------------*/void AllocateMemory(char **s, int l, char *d){	*s = malloc(l + 1);	bzero(*s, l + 1);	memcpy(*s, d, l);}/************关于本文档*********************************************filename: das-server.c*purpose: 这是在Linux下用C语言写的目录访问服务器，支持目录浏览和文件下载*wrote by: zhoulifa(zhoulifa@163.com) 周立发(http://zhoulifa.bokee.com)Linux爱好者 Linux知识传播者 SOHO族 开发者 最擅长C语言*date time:2007-01-26 19:32*Note: 任何人可以任意复制代码并运用这些文档，当然包括你的商业用途* 但请遵循GPL*Thanks to: Google.com*Hope:希望越来越多的人贡献自己的力量，为科学技术发展出力* 科技站在巨人的肩膀上进步更快！感谢有开源前辈的贡献！*********************************************************************//*------------------------------------------------------*--- GiveResponse - 把Path所指的内容发送到client_sock去*-------------------如果Path是一个目录，则列出目录内容*-------------------如果Path是一个文件，则下载文件*------------------------------------------------------*/void GiveResponse(FILE * client_sock, char *Path){	struct dirent *dirent;	struct stat info;	char Filename[MAXPATH];	DIR *dir;	int fd, len, ret;	char *p, *realPath, *realFilename, *nport;	/* 获得实际工作目录或文件 */	len = strlen(dirroot) + strlen(Path) + 1;	realPath = malloc(len + 1);	bzero(realPath, len + 1);	sprintf(realPath, "%s/%s", dirroot, Path);	/* 获得实际工作端口 */	len = strlen(port) + 1;	nport = malloc(len + 1);	bzero(nport, len + 1);	sprintf(nport, ":%s", port);	/* 获得实际工作目录或文件的信息以判断是文件还是目录 */	if (stat(realPath, &info)) {	fprintf(client_sock,	"HTTP/1.1 200 OK\r\nServer: DAS by ZhouLifa\r\nConnection: close\r\n\r\n<html><head><title>%d - %s</title></head>"	"<body><font size=+4>Linux 下目录访问服务器</font><br><hr width=\"100%%\"><br><center>"	"<table border cols=3 width=\"100%%\">", errno,	strerror(errno));	fprintf(client_sock,	"</table><font color=\"CC0000\" size=+2>请向管理员咨询为何出现如下错误提示：\n%s %s</font></body></html>",	Path, strerror(errno));	goto out;	}	/* 处理浏览文件请求，即下载文件 */	if (S_ISREG(info.st_mode)) {		fd = open(realPath, O_RDONLY);		len = lseek(fd, 0, SEEK_END);		p = (char *) malloc(len + 1);		bzero(p, len + 1);		lseek(fd, 0, SEEK_SET);		ret = read(fd, p, len);		close(fd);		fprintf(client_sock,		"HTTP/1.1 200 OK\r\nServer: DAS by ZhouLifa\r\nConnection: keep-alive\r\nContent-type: application/*\r\nContent-Length:%d\r\n\r\n",		len);		fwrite(p, len, 1, client_sock);		free(p);	} else if (S_ISDIR(info.st_mode)) {	/* 处理浏览目录请求 */	dir = opendir(realPath);	fprintf(client_sock,	"HTTP/1.1 200 OK\r\nServer: DAS by ZhouLifa\r\nConnection: close\r\n\r\n<html><head><title>%s</title></head>"	"<body><font size=+4>Linux 下目录访问服务器</font><br><hr width=\"100%%\"><br><center>"	"<table border cols=3 width=\"100%%\">", Path);	fprintf(client_sock,	"<caption><font size=+3>目录 %s</font></caption>\n",	Path);	fprintf(client_sock,	"<tr><td>名称</td><td>大小</td><td>修改时间</td></tr>\n");	if (dir == 0) {		fprintf(client_sock,		"</table><font color=\"CC0000\" size=+2>%s</font></body></html>",		strerror(errno));	return;	}	/* 读取目录里的所有内容 */	while ((dirent = readdir(dir)) != 0) {	if (strcmp(Path, "/") == 0)		sprintf(Filename, "/%s", dirent->d_name);	else		sprintf(Filename, "%s/%s", Path, dirent->d_name);	fprintf(client_sock, "<tr>");	len = strlen(dirroot) + strlen(Filename) + 1;	realFilename = malloc(len + 1);	bzero(realFilename, len + 1);	sprintf(realFilename, "%s/%s", dirroot, Filename);	if (stat(realFilename, &info) == 0) {		if (strcmp(dirent->d_name, "..") == 0)			fprintf(client_sock,			"<td><a href=\"http://%s%s%s\">(parent)</a></td>",			host, atoi(port) == 80 ? "" : nport,			dir_up(Path));		else			fprintf(client_sock,			"<td><a href=\"http://%s%s%s\">%s</a></td>",			host, atoi(port) == 80 ? "" : nport, Filename,			dirent->d_name);		if (S_ISDIR(info.st_mode))			fprintf(client_sock, "<td>目录</td>");		else if (S_ISREG(info.st_mode))			fprintf(client_sock, "<td>%d</td>", info.st_size);		else if (S_ISLNK(info.st_mode))			fprintf(client_sock, "<td>链接</td>");		else if (S_ISCHR(info.st_mode))			fprintf(client_sock, "<td>字符设备</td>");		else if (S_ISBLK(info.st_mode))			fprintf(client_sock, "<td>块设备</td>");		else if (S_ISFIFO(info.st_mode))			fprintf(client_sock, "<td>FIFO</td>");		else if (S_ISSOCK(info.st_mode))			fprintf(client_sock, "<td>Socket</td>");		else			fprintf(client_sock, "<td>(未知)</td>");		fprintf(client_sock, "<td>%s</td>", ctime(&info.st_ctime));	}fprintf(client_sock, "</tr>\n");free(realFilename);}fprintf(client_sock, "</table></center></body></html>");} else {/* 既非常规文件又非目录，禁止访问 */fprintf(client_sock,"HTTP/1.1 200 OK\r\nServer: DAS by ZhouLifa\r\nConnection: close\r\n\r\n<html><head><title>permission denied</title></head>""<body><font size=+4>Linux 下目录访问服务器</font><br><hr width=\"100%%\"><br><center>""<table border cols=3 width=\"100%%\">");fprintf(client_sock,"</table><font color=\"CC0000\" size=+2>你访问的资源'%s'被禁止访问，请联系管理员解决！</font></body></html>",Path);}out:free(realPath);free(nport);}/*------------------------------------------------------*--- getoption - 分析取出程序的参数*------------------------------------------------------*/void getoption(int argc, char **argv){	int c, len;	char *p = 0;	opterr = 0;	while (1) {		int option_index = 0;		static struct option long_options[] = {			{"host", 1, 0, 0},			{"port", 1, 0, 0},			{"back", 1, 0, 0},			{"dir", 1, 0, 0},			{"log", 1, 0, 0},			{"daemon", 0, 0, 0},			{0, 0, 0, 0}		};/* 本程序支持如一些参数：* --host IP地址 或者 -H IP地址* --port 端口 或者 -P 端口* --back 监听数量 或者 -B 监听数量* --dir 网站根目录 或者 -D 网站根目录* --log 日志存放路径 或者 -L 日志存放路径* --daemon 使程序进入后台运行模式*/	c = getopt_long(argc, argv, "H:P:B:D:L",	long_options, &option_index);	if (c == -1 || c == '?')		break;	if(optarg) len = strlen(optarg);		else len = 0;	if ((!c && !(strcasecmp(long_options[option_index].name, "host")))		|| c == 'H')		p = host = malloc(len + 1);	else if ((!c		&&		!(strcasecmp(long_options[option_index].name, "port")))		|| c == 'P')		p = port = malloc(len + 1);	else if ((!c		&&		!(strcasecmp(long_options[option_index].name, "back")))		|| c == 'B')		p = back = malloc(len + 1);	else if ((!c		&& !(strcasecmp(long_options[option_index].name, "dir")))		|| c == 'D')		p = dirroot = malloc(len + 1);	else if ((!c		&& !(strcasecmp(long_options[option_index].name, "log")))		|| c == 'L')		p = logdir = malloc(len + 1);	else if ((!c		&&		!(strcasecmp		(long_options[option_index].name, "daemon")))) {	daemon_y_n = 1;	continue;	}	else		break;	bzero(p, len + 1);	memcpy(p, optarg, len);	}}int main(int argc, char **argv){	struct sockaddr_in addr;	int sock_fd, addrlen;	/* 获得程序工作的参数，如 IP 、端口、监听数、网页根目录、目录存放位置等 */	getoption(argc, argv);	if (!host) {		addrlen = strlen(DEFAULTIP);		AllocateMemory(&host, addrlen, DEFAULTIP);	}	if (!port) {		addrlen = strlen(DEFAULTPORT);		AllocateMemory(&port, addrlen, DEFAULTPORT);	}	if (!back) {		addrlen = strlen(DEFAULTBACK);		AllocateMemory(&back, addrlen, DEFAULTBACK);	}	if (!dirroot) {		addrlen = strlen(DEFAULTDIR);		AllocateMemory(&dirroot, addrlen, DEFAULTDIR);	}	if (!logdir) {		addrlen = strlen(DEFAULTLOG);		AllocateMemory(&logdir, addrlen, DEFAULTLOG);	}	printf	("host=%s port=%s back=%s dirroot=%s logdir=%s %s是后台工作模式(进程ID：%d)\n",	host, port, back, dirroot, logdir, daemon_y_n?"":"不", getpid());	/* fork() 两次处于后台工作模式下 */	if (daemon_y_n) {		if (fork())			exit(0);		if (fork())			exit(0);		close(0), close(1), close(2);		logfp = fopen(logdir, "a+");		if (!logfp)			exit(0);	}	/* 处理子进程退出以免产生僵尸进程 */	signal(SIGCHLD, SIG_IGN);	/* 创建 socket */	if ((sock_fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {		if (!daemon_y_n) {			prterrmsg("socket()");		} else {		wrterrmsg("socket()");		}	}	/* 设置端口快速重用 */	addrlen = 1;	setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR, &addrlen,	sizeof(addrlen));	addr.sin_family = AF_INET;	addr.sin_port = htons(atoi(port));	addr.sin_addr.s_addr = inet_addr(host);	addrlen = sizeof(struct sockaddr_in);	/* 绑定地址、端口等信息 */	if (bind(sock_fd, (struct sockaddr *) &addr, addrlen) < 0) {		if (!daemon_y_n) {			prterrmsg("bind()");		} else {			wrterrmsg("bind()");		}	}	/* 开启临听 */	if (listen(sock_fd, atoi(back)) < 0) {		if (!daemon_y_n) {			prterrmsg("listen()");		} else {			wrterrmsg("listen()");		}	}	while (1) {		int len;		int new_fd;			addrlen = sizeof(struct sockaddr_in);		/* 接受新连接请求 */		new_fd = accept(sock_fd, (struct sockaddr *) &addr, &addrlen);		if (new_fd < 0) {			if (!daemon_y_n) {				prterrmsg("accept()");			} else {				wrterrmsg("accept()");			}			break;		}		bzero(buffer, MAXBUF + 1);		sprintf(buffer, "连接来自于: %s:%d\n",		inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));		if (!daemon_y_n) {			prtinfomsg(buffer);		} else {			wrtinfomsg(buffer);		}		/* 产生一个子进程去处理请求，当前进程继续等待新的连接到来 */		if (!fork()) {			bzero(buffer, MAXBUF + 1);			if ((len = recv(new_fd, buffer, MAXBUF, 0)) > 0) {				FILE *ClientFP = fdopen(new_fd, "w");				if (ClientFP == NULL) {					if (!daemon_y_n) {						prterrmsg("fdopen()");					} else {						prterrmsg("fdopen()");					}				} else {					char Req[MAXPATH + 1] = "";					sscanf(buffer, "GET %s HTTP", Req);					(buffer, MAXBUF + 1);					sprintf(buffer, "请求取文件: \"%s\"\n", Req);					if (!daemon_y_n) {						prtinfomsg(buffer);					} else {						wrtinfomsg(buffer);					}					/* 处理用户请求 */					GiveResponse(ClientFP, Req);					fclose(ClientFP);				}			}		exit(0);		}		close(new_fd);	}	close(sock_fd);return 0;}

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