/* code c, change the DEFAULTIP to your localhost IP*/
#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 "127.0.0.1"
#define DEFAULTPORT "80"
#define DEFAULTBACK "10"
#define DEFAULTDIR "/home"
#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
char 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
*********************************************************************/
/*------------------------------------------------------
*--- 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:SONG\r\nConnection: close\r\nContent-Type:text/html; charset=UTF-8\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:SONG\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:SONG\r\nConnection: close\r\nContent-Type:text/html; charset=UTF-8\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:SONG\r\nConnection: close\r\nContent-Type:text/html; charset=UTF-8\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& gt;",
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;
struct sockaddr_in my_addr;
my_addr.sin_addr.s_addr=htonl(INADDR_ANY);
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);
bzero(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;
}