本blog主要是模仿http server的实现，使得客户端使用浏览器访问server所指定的目录。
- 当访问的为一个目录时， 则列出改目录下的所有文件
- 当访问的是文件时，则下载文件到本地
本log仅仅做为httpd server的测试版本，功能不健全，学习而已！
1. 效果图
1.1 整体图：
1.2 目录：
要查看，不能直接点击，要在搜索栏中输入绝对路径，如 http://192.168.58.128/log/
1.3 文件：
要下载文件，不能直接点击，要在搜索栏中输入绝对路径，如 http://192.168.58.128/log/syslog
1.4 错误：
2. 预备知识
欲学会本log所述内容，必须具备一下的基础知识：
- 守候进程：
基本概念：https://www.cnblogs.com/z-sm/p/5675051.html
编程API：https://blog.csdn.net/lianghe_work/article/details/47659889
- sscanf()函数：
- 日志操作：
- **socket 编程： **
基础知识：http://www.cnblogs.com/Jimmy1988/p/7839940.html
socket API: http://www.cnblogs.com/Jimmy1988/p/7895213.html
3. 源码地址
本blog的源码放到了本人的github上了，包括项目源码/makefile/配置文件等。
github 地址如下：
4. 源码展示
本文源码分为三个文件：
- deamon.c: 各种函数功能的实现
- http.c: main函数
- http.h: 头文件
4.1 源码
①. http.h
/**********************************************************************************************
*Copyright (C), 2018 ,Jimmy_Nie. https://www.cnblogs.com/Jimmy1988/
*
*
*File name: httpd.c
*Description:实现httpd功能
* Author Date Modify
* Jimmy 2018-04-16 Create
*
**********************************************************************************************/
#ifndef HTTP_H
#define HTTP_H
#include <arpa/inet.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/if.h>
#include <netinet/in.h>
#include <pwd.h>
#include <grp.h>
#include <stdio.h>
#include <sys/socket.h>
#include <syslog.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <signal.h>
#include <stdarg.h>
#include <time.h>
#include <unistd.h>
/*********************************全局变量***************************************/
extern char home_dir[32];
extern char ip_addr[16];
extern char port_no[8];
extern char backlog[8];
#define _BSD_SOURCE
/***********************************************************
* Function: write_info
* Input:
* Output:
* Return:
* Autor Date Modify
* Jimmy 2018-04-16 Create
*
***********************************************************/
#define write_info(fmt, arg...) \
{ \
char buff[512]; char buff1[256]; \
bzero(buff, sizeof(buff)); \
bzero(buff1, sizeof(buff)); \
sprintf(buff, "<%s:%d> ", __FUNCTION__, __LINE__); \
sprintf(buff1, fmt, ##arg); \
strcat(buff, buff1); \
syslog(LOG_INFO, "%s", buff); \
}
/*********************************函数声明***************************************/
extern void init_daemon(char *p_name, int facility);
extern int init_socket(int *p_sockfd);
extern int get_ip_addr(char *ip_addr);
extern void response_client(int client_sock, char *path);
extern int read_conf(char *cmd, char *data);
#endif
②. http.c
/**********************************************************************************************
*Copyright (C), 2018 ,Jimmy_Nie. https://www.cnblogs.com/Jimmy1988/
*
*
*File name: httpd.c
*Description:实现httpd功能
* Author Date Modify
* Jimmy 2018-04-16 Create
*
**********************************************************************************************/
#include "http.h"
char home_dir[32];
char ip_addr[16];
char port_no[8];
char backlog[8];
/***********************************************************
* Function: main函数
* Input:
* Output:
* Return:
* Autor Date Modify
* Jimmy 2018-04-16 Create
*
***********************************************************/
int main(int argc, char *argv[])
{
int rtn = 0;
int sock_fd = -1;
struct sockaddr_in client_addr;
char buf[256];
pid_t pid = -1;
//1. 以守候进程的方式运行此http进程
init_daemon(argv[0], LOG_INFO);
//2. 获取参数值
//2.1 获取home_dir, 如果配置文件没有，则默认为/tmp
rtn = read_conf("home_dir", home_dir);
if(rtn < 0)
exit(EXIT_FAILURE);
else if(0 == rtn) //即未从conf文件中读取到数据
{
bzero(home_dir, sizeof(home_dir));
strcpy(home_dir, "/tmp");
}
//2.2 获取ip_addr, 如果配置文件没有，则设置为本机的wlan0的ip地址
rtn = read_conf("ip_addr", ip_addr);
if(rtn < 0)
exit(EXIT_FAILURE);
else if(0 == rtn) //即未从conf文件中读取到数据
{
bzero(ip_addr, sizeof(ip_addr));
get_ip_addr(ip_addr);
}
//2.3 获取port_no, 如果配置文件没有，则默认为80
rtn = read_conf("port_no", port_no);
if(rtn < 0)
exit(EXIT_FAILURE);
else if(0 == rtn) //即未从conf文件中读取到数据
{
bzero(port_no, sizeof(port_no));
strcpy(port_no, "80");
}
//2.4 获取port_no, 如果配置文件没有，则默认为10(最多链接10个client)
rtn = read_conf("backlog", backlog);
if(rtn < 0)
exit(EXIT_FAILURE);
else if(0 == rtn) //即未从conf文件中读取到数据
{
bzero(backlog, sizeof(backlog));
strcpy(backlog, "10");
}
write_info("home_dir=%s, ip_addr=%s, port_no=%d, backlog=%d\n", home_dir, ip_addr, atoi(port_no), atoi(backlog));
//3. 初始化socket
rtn = init_socket(&sock_fd);
if(rtn < 0)
exit(EXIT_FAILURE);
//4. 接收新的client链接
while(1)
{
int len;
int new_fd = -1;
len = sizeof(struct sockaddr_in);;
memset(&client_addr, 0, len);
new_fd = accept(sock_fd, (struct sockaddr *)&client_addr, &len);
if(new_fd < 0)
{
write_info("accept new client connection failed !! [%d:%s] \n", errno, strerror(errno));
exit(EXIT_FAILURE);
}
bzero(buf, sizeof(buf));
sprintf(buf, "Connect from %s:%d\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
write_info("%s\n", buf);
if((pid = fork()) == -1)
{
write_info("fork() failed");
exit(EXIT_FAILURE);
}
else if(0 == pid) //在子进程中
{
bzero(buf, sizeof(buf));
len = recv(new_fd, buf, sizeof(buf), 0);
if(len > 0) //接到了信息
{
char req[256];
bzero(req, sizeof(req));
sscanf(buf, "GET %s HTTP", req);
bzero(buf, sizeof(buf));
sprintf(buf, "Request get the file: %s", req);
write_info("%s\n", buf);
response_client(new_fd, req);
}
sleep(30); //建议使用chrome，firefox和IE貌似一直在请求，一旦tcp链接断开，就GG了
exit(EXIT_SUCCESS);
}
else //在父进程中
{
close(new_fd);
continue;
}
}
close(sock_fd);
return 0;
}
③. deamon.c
/**********************************************************************************************
*Copyright (C), 2018 ,Jimmy_Nie. https://www.cnblogs.com/Jimmy1988/
*
*
*File name: httpd.c
*Description:实现httpd功能
* Author Date Modify
* Jimmy 2018-04-16 Create
*
**********************************************************************************************/
#include "http.h"
/***********************************************************
* Function: init_daemon
* Input:
1. char *p_name: 进程名称
2. int facility: 系统log进程的level
* Output:
* Return:
* Autor Date Modify
* Jimmy 2018-04-16 Create
*
***********************************************************/
void init_daemon(char *p_name, int facility)
{
int pid = 0;
int cnt = 0;
//1. 忽略所有可能的终端信号(守候进程不能受到终端的影响)
signal(SIGINT, SIG_IGN); //终端中断符
signal(SIGTTOU, SIG_IGN); //后台向控制端tty写作业
signal(SIGTSTP, SIG_IGN); //终端挂起
signal(SIGHUP, SIG_IGN); //链接断开
signal(SIGQUIT, SIG_IGN); //终端退出
//2. 创建子进程，父进程推出(因为父进程由终端创建)
if((pid = fork()) > 0) //在父进程中
exit(EXIT_SUCCESS);
else if(pid < 0)
{
printf("fork error: [%d:%s]", errno, strerror(errno));
exit(EXIT_FAILURE);
}
//3. 设置新的会话组长，新进程组长，脱离终端
setsid();
//4. 再次创建一个子进程，并让现在的父进程退出
if((pid = fork()) > 0) //在父进程中
exit(EXIT_SUCCESS);
else if(pid < 0)
{
printf("fork error: [%d:%s]", errno, strerror(errno));
exit(EXIT_FAILURE);
}
//5. 修改子进程的主目录为/tmp
chdir("/tmp");
//6. 重置文件掩码
umask(0);
//7. 关闭所有父进程打开的文件描述符(包括stdin/stdout/stderr这三个; NOFILE为256)
for(cnt=0; cnt<NOFILE; cnt++)
close(cnt);
//8. 忽略子进程的退出信号
signal(SIGCHLD, SIG_IGN);
//9. 与syslogd守候进程关联
openlog(p_name, LOG_PID, facility); //每个message都会增加pid进去
return ;
}
/***********************************************************
* Function: read_conf
* Description: 读取配置文件，找出命令对应的值
* Input:
1. char *cmd: 欲查找的命令
* Output:
1. char *data: 查找到的命令的值
* Return:
1. 命令所在字符串中的位置
*
* Autor Date Modify
* Jimmy 2018-04-16 Create
*
***********************************************************/
int read_conf(char *cmd, char *data)
{
int fd = -2;
char buf[1024];
size_t rd_size;
char *match = NULL;
memset(buf, 0, sizeof(buf));
//0. 检查传入的参数
if((NULL == cmd) || (NULL == data))
{
write_info("Input arguments error !");
return -1;
}
//1. 打开配置文件
fd = open("/etc/httpd_test.conf", O_RDONLY);
if(fd < 0) //注意，此处fd=0,因为关闭了stdin/stdout/stderr,所以fd应该从0开始 (TMD,排查了很久,以为出错了)
{
write_info("open the file /etc/httpd_test.conf failed! [fd=%d] [%d:%s]", fd, errno, strerror(errno));
return -1;
}
//2. 读取文件的所有数据
rd_size = read(fd, buf, sizeof(buf));
if((rd_size <= 0) || (rd_size == sizeof(buf)))
{
write_info("read the file /etc/httpd_test.conf failed! [%d:%s]", errno, strerror(errno));
return -1;
}
buf[rd_size] = '\0';
//3. 关闭文件
close(fd);
//4. 参数匹配
if(strncmp(cmd, "home_dir", strlen("home_dir")) == 0)
{
match = strstr(buf, "home_dir=");
if(NULL == match) //若未找到匹配项
{
write_info("Does not found the cmd[%s] in the file /etc/httpd_test.conf!", cmd);
return 0;
}
rd_size = sscanf(match, "home_dir=%s", data);
write_info("Found the command [%s], position=%ld\n", cmd, rd_size);
return rd_size;
}
if(strncmp(cmd, "port_no", strlen("port_no")) == 0)
{
match = strstr(buf, "port_no=");
if(NULL == match) //若未找到匹配项
{
write_info("Does not found the cmd[%s] in the file /etc/httpd_test.conf!", cmd);
return 0;
}
rd_size = sscanf(match, "port_no=%s", data);
write_info("Found the command [%s], position=%ld\n", cmd, rd_size);
return rd_size;
}
if(strncmp(cmd, "ip_addr", strlen("ip_addr")) == 0)
{
match = strstr(buf, "ip_addr=");
if(NULL == match) //若未找到匹配项
{
write_info("Does not found the cmd[%s] in the file /etc/httpd_test.conf!", cmd);
return 0;
}
rd_size = sscanf(match, "ip_addr=%s", data);
write_info("Found the command [%s], position=%ld\n", cmd, rd_size);
return rd_size;
}
if(strncmp(cmd, "backlog", strlen("backlog")) == 0)
{
match = strstr(buf, "backlog=");
if(NULL == match) //若未找到匹配项
{
write_info("Does not found the cmd[%s] in the file /etc/httpd_test.conf!", cmd);
return 0;
}
rd_size = sscanf(match, "backlog=%s", data);
write_info("Found the command [%s], position=%ld\n", cmd, rd_size);
return rd_size;
}
return 0;
}
/***********************************************************
* Function: init_socket
* Description: 初始化socket
* Input:
1. char *p_sockfd: socket 文件描述符
* Output:
* Return:
0： on success
1: on failure
*
* Autor Date Modify
* Jimmy 2018-04-16 Create
*
***********************************************************/
int init_socket(int *p_sockfd)
{
int rtn =0;
struct sockaddr_in serv_addr;
int sock_fd;
//1. 建立socket
sock_fd = socket(AF_INET, SOCK_STREAM, 0);
if(0 > sock_fd)
{
write_info("Create socket failed !! [%d:%s] ", errno, strerror(errno));
return -1;
}
write_info("socket()");
//2. 设置socket允许复用本地IP和端口
int tmp = 1;
setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR, &tmp, sizeof(tmp));
//3. 绑定本地IP和端口
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(atoi(port_no));
serv_addr.sin_addr.s_addr = inet_addr(ip_addr);
rtn = bind(sock_fd, (struct sockaddr *)&serv_addr, sizeof(struct sockaddr_in));
if(rtn < 0)
{
write_info("Bind the IP addr [%s] failed !! [%d:%s] ", errno, ip_addr, strerror(errno));
return -1;
}
write_info("bind()");
//4. 监听网络
rtn = listen(sock_fd, atoi(backlog));
if(rtn < 0)
{
write_info("Listen the network failed !! [%d:%s] ", errno, strerror(errno));
return -1;
}
write_info("listen()");
*p_sockfd = sock_fd;
return rtn;
}
/***********************************************************
* Function: get_ip_addr
* Description: 初始化socket
* Input:
1. char *p_addr: 本地IP地址
2. int port: 本地端口
3. int backlog: 最多可接受多少个链接
* Output:
* Return:
0： on success
1: on failure
*
* Autor Date Modify
* Jimmy 2018-04-16 Create
*
***********************************************************/
int get_ip_addr(char *ip_addr)
{
int sock_fd;
struct ifreq ifr;
sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
strcpy(ifr.ifr_name, "ens33"); //注意此处的修改,不同的系统名称不一样，一般为eth0
//获取ens33的接口信息
if(ioctl(sock_fd, SIOCGIFADDR, &ifr) < 0)
{
write_info("bind");
return -1;
}
sprintf(ip_addr, "%s", inet_ntoa(((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr));
return 0;
}
/***********************************************************
* Function: file_type
* Description: 获取文件的类型
* Input:
1. mode_t st_mode: 文件类型
* Output:
* Return:
文件类型的标识符
*
* Autor Date Modify
* Jimmy 2018-04-17 Create
*
***********************************************************/
char file_type(mode_t st_mode)
{
/* only support c89
static char type;
switch(st_mode & S_IFMT)
{
case S_IFSOCK:
type = 's';
break;
case S_IFLNK:
type = 'l';
break;
case S_IFREG:
type = '-';
break;
case S_IFBLK:
type = 'b';
break;
case S_IFCHR:
type = 'c';
break;
case S_IFIFO:
type = 'p';
break;
case S_IFDIR:
type = 'd';
break;
default:
type = 'E';
break;
}
return type;
*/
if (S_ISREG(st_mode))
return '-';
else if (S_ISDIR(st_mode))
return 'd';
else if (S_ISCHR(st_mode))
return 'c';
else if (S_ISBLK(st_mode))
return 'b';
else if (S_ISLNK(st_mode))
return 'l';
else if (S_ISFIFO(st_mode))
return 'p';
//else if (S_ISSOCK(st_mode))
//return 's';
else
return '?';
}
/***********************************************************
* Function: dir_up
* Description: 获取上级目录
* Input:
1. char *dir_path: 目录
* Output:
* Return:
文件类型的标识符
*
* Autor Date Modify
* Jimmy 2018-04-17 Create
*
***********************************************************/
char *dir_up(char *dir_path)
{
static char path[128];
int len;
strcpy(path, dir_path);
len = strlen(path);
if((len > 1) && (path[len-1] == '/'))
len--;
while((len > 1) && (path[len-1] != '/'))
len--;
path[len] = '\0';
return path;
}
/***********************************************************
* Function: response_client
* Description: 响应客户端的请求:若为dir,则列出所有文件;若为file,则下载
* Input:
1. char *p_addr: 本地IP地址
2. char *path: 文件的请求位置
* Output:
* Return:
0： on success
1: on failure
*
* Autor Date Modify
* Jimmy 2018-04-17 Create
*
***********************************************************/
void response_client(int client_sock, char *path)
{
int rtn = 0;
int len = 0;
char real_path[64];
char file_name[128];
char tmp_port[8];
struct stat stat_info;
char send_msg[512];
DIR *dir = NULL;
int fd = -1;
struct dirent *dirt;
ssize_t send_size = 0;
char *p_time ;
struct passwd *p_user;
struct group *p_group;
//0. 初始化变量
memset(real_path, 0, sizeof(real_path));
memset(tmp_port, 0, sizeof(tmp_port));
memset(send_msg, 0, sizeof(send_msg));
memset(file_name, 0, sizeof(file_name));
//memset(p_time, 0, sizeof(p_time));
//1. 获取绝对路径
sprintf(real_path, "%s%s", home_dir, path);
write_info("The real_path: %s\n", real_path);
//2. 获取端口信息(用于后续的输出)
//sprintf(tmp_port, " %s", port_no);
//3. 获取绝对路径的文件属性(文件还是目录，或其它)
rtn = stat(real_path, &stat_info);
if(0 != rtn)
{
write_info("Get the path[%s] state failed!! [%d:%s] ", real_path, errno, strerror(errno));
//将错误信息发送给client端
sprintf(send_msg, "HTTP/1.1 200 OK\r\nServer: Http test server\r\nConnection: close\r\n\r\n" \
"<html><head><title>%d - %s</title></head>" \
"<body><font size=+4>Linux http server</font><br><hr width=\"100%%\"><br><center>" \
"<table border cols=3 width=\"100%%\"></table><font_color=\"C0000\" size=+2>" \
"connect to administrator, error code is \n%s %s </font></body></html>",
errno, strerror(errno), path, strerror(errno));
send(client_sock, send_msg, strlen(send_msg)+1, 0);
if(send_size <= 0)
{
write_info("Send http header failed !!! \n");
}
else
{
write_info("Send http header succeed ! \n");
}
return -1;
}
//如果请求的路径是一个文件，则将改文件直接发送给客户端
else if(S_ISREG(stat_info.st_mode))
{
write_info("The %s is a file! \n", real_path);
fd = open(real_path, O_RDONLY); //只读的方式打开
len = lseek(fd, 0, SEEK_END); //查看打开文件的大小
lseek(fd, 0, SEEK_SET); //将文件读写定位到开始位置
//开辟一个内存空间，用于存放读取到的文件信息
char *tmp_mem = (char *)malloc(len+1);
bzero(tmp_mem, len+1);
for(int i=0; i<len; i+=1024) //读取文件，每次读 1k bytes
{
rtn = read(fd, tmp_mem+i, 1024);
if(rtn <= 0)
write_info("Read the file [%s] failed!! [%d:%s] ", real_path, errno, strerror(errno));
}
close(fd); //读完之后，就可以关闭文件了
//将文件内容发送给客户端
memset(send_msg, 0, sizeof(send_msg));
sprintf(send_msg, "HTTP/1.1 200 OK\r\nServer: Http test server\r\nConnection keep alive\r\n"\
"Content-type: application/*\r\nContent-length:%d\r\n\r\n", len);
send_size = send(client_sock, send_msg, strlen(send_msg)+1, 0);
if(send_size <= 0)
{
write_info("Send http header failed !!! \n");
}
else
{
write_info("Send http header succeed ! \n");
}
send(client_sock, tmp_mem, len, 0);
if(send_size <= 0)
{
write_info("Send http message failed !!! \n");
}
else
{
write_info("Send http message succeed, len=%d ! \n", len);
}
sleep(20);
free(tmp_mem);
}
//如果请求的路径是一个目录，将目录下的列表信息全部输出
else if(S_ISDIR(stat_info.st_mode))
{
write_info("The %s is a directory! \n", real_path);
//将http协议信息发送给客户端，为了便于显示，先发送表格头
memset(send_msg, 0, sizeof(send_msg));
sprintf(send_msg, "HTTP/1.1 200 OK\r\nServer: Http test server\r\nConnection: close\r\n\r\n" \
"<html><head><title>Jimmy_Nie: %s</title></head>" \
"<body><font size=+4>Linux http server file - Jimmy</font><br><hr width=\"100%%\"><br><center>" \
"<table border cols=3 width=\"100%%\">" \
"<caption><font size=+3> Directory: %s</font></caption>\n" \
"<tr><td>Name</td><td>Type</td><td>Owner</td><td>Group</td>" \
"<td>Size</td><td>Modify time</td></tr>\n", \
real_path, real_path);
send_size = send(client_sock, send_msg, strlen(send_msg)+1, 0);
if(send_size <= 0)
{
write_info("Send http header failed !!! \n");
}
else
{
write_info("Send http header succeed ! \n");
}
dir = opendir(real_path); //打开绝对路径的目录
if(NULL == dir) //若打开目录失败
{
write_info("Open the %s failed! \n", real_path);
memset(send_msg, 0, sizeof(send_msg));
sprintf(send_msg, "</table><font color=\"CC0000\" size=+2>%s</font></body></html>", strerror(errno));
send_size = send(client_sock, send_msg, strlen(send_msg)+1, 0);
if(send_size <= 0)
{
write_info("Send http header failed !!! \n");
}
else
{
write_info("Send http header succeed ! \n");
}
return -1;
}
while((dirt = readdir(dir)) != NULL)
{
if(dirt->d_name[0] == '.') //即为隐藏文件
continue;
send(client_sock, "<tr>", strlen("<tr>"), 0);
bzero(file_name, sizeof(file_name));
sprintf(file_name, "%s/%s", real_path, dirt->d_name);
write_info("opened the file %s !\n", file_name);
if(stat(file_name, &stat_info) == 0) //读取文件信息
{
memset(send_msg, 0, sizeof(send_msg));
if(0 == strcmp(dirt->d_name, "..")) //若为..，则要求到达上级目录
sprintf(send_msg, "<td><a href=\"http://%s:%s %s\">(parent)</a></td>",
ip_addr, port_no, dir_up(path));
else
sprintf(send_msg, "<td><a href=\"http://%s:%s %s/%s\">%s</a></td>",
ip_addr, port_no, path, dirt->d_name, dirt->d_name);
send_size = send(client_sock, send_msg, strlen(send_msg), 0);
if(send_size <= 0)
{
write_info("Send http header failed !!! \n");
}
else
{
write_info("Send http header succeed ! \n");
}
p_time = ctime(&stat_info.st_mtime); //获取修改时间
p_user = getpwuid(stat_info.st_uid); //获取文件拥有着
p_group = getgrgid(stat_info.st_gid); //获取文件组信息
write_info("Time: %s, user: %s, group: %s\n", p_time, p_user->pw_name, p_group->gr_name);
//向客户端输出文件类型
memset(send_msg, 0, sizeof(send_msg));
sprintf(send_msg, "<td>%c</td>", file_type(stat_info.st_mode));
send_size = send(client_sock, send_msg, strlen(send_msg), 0);
if(send_size <= 0)
{
write_info("Send file type failed !!! \n");
}
else
{
write_info("Send file type succeed ! \n");
}
//向客户端输出文件所有者信息
memset(send_msg, 0, sizeof(send_msg));
sprintf(send_msg, "<td>%s</td>", p_user->pw_name);
send_size = send(client_sock, send_msg, strlen(send_msg), 0);
if(send_size <= 0)
{
write_info("Send file user failed !!! \n");
}
else
{
write_info("Send file user succeed ! \n");
}
//向客户端输出文件组信息
memset(send_msg, 0, sizeof(send_msg));
sprintf(send_msg, "<td>%s</td>", p_group->gr_name);
send_size = send(client_sock, send_msg, strlen(send_msg), 0);
if(send_size <= 0)
{
write_info("Send file group failed !!! \n");
}
else
{
write_info("Send file group succeed ! \n");
}
//向客户端输出文件大小
memset(send_msg, 0, sizeof(send_msg));
sprintf(send_msg, "<td>%d</td>", stat_info.st_size);
send_size = send(client_sock, send_msg, strlen(send_msg), 0);
if(send_size <= 0)
{
write_info("Send file size failed !!! \n");
}
else
{
write_info("Send file size succeed ! \n");
}
//向客户端输出修改时间
char tmp_send[512];
memset(send_msg, 0, sizeof(send_msg)); //此处很奇怪，用send_message就发不出去
memset(tmp_send, 0, sizeof(tmp_send));
sprintf(tmp_send, "<td>%s</td>", p_time);
send_size = send(client_sock, tmp_send, strlen(tmp_send), 0);
if(send_size <= 0)
{
write_info("Send file modify time failed !!! \n");
}
else
{
write_info("Send file modify time succeed ! \n");
}
}
send(client_sock, "</tr>\n", strlen("</tr>\n"), 0);
}
send(client_sock, "</table></center></body></html>", strlen("</table></center></body></html>"), 0);
}
else //如果木有权限访问
{
memset(send_msg, 0, sizeof(send_msg));
sprintf(send_msg, "HTTP/1.1 200 OK\r\nServer: Http test server\r\nConnection: close\r\n\r\n" \
"<html><head><title>%s</title></head>" \
"<body><font size=+4>Linux http server file</font><br><hr width=\"100%%\"><br><center>" \
"<table border cols=3 width=\"100%%\"></table>" \
"<font color=\"CC0000\" size=+2>[%s]Permission denied, please contact the admin"\
"</font></body></html>", path);
send_size = send(client_sock, send_msg, strlen(send_msg)+1, 0);
if(send_size <= 0)
{
write_info("Send http header failed !!! \n");
}
else
{
write_info("Send http header succeed ! \n");
}
}
return ;
}
4.2 makefile
#==========================================
# Copyright @ Jimmy 2018-04-21
# httpd makefile
# e-mail: JimmyNie2017@163.com
#==========================================
SHELL = /bin/bash
SRC_DIR = ./code
INC_DIR = ./code
SRC_FILE := $(shell find $(SRC_DIR) -name '*.c')
SRC_FILE += $(shell find $(SRC_DIR) -name '*.cpp')
INC_FILE := $(shell find $(INC_DIR) -name '*.h')
INC_FILE += $(shell find $(INC_DIR) -name '*.hpp')
TEMP_INC_DIR := $(dir $(INC_FILE))
INC_DIR := $(foreach tmp, $(TEMP_INC_DIR), -I$(tmp))
OBJS = $(patsubst %.c, %.o, $(patsubst %.cpp, %.o, $(SRC_FILE)))
# Target with the date time
TARGET := httpd-$(shell date --rfc-3339='date')
#compile tools
CC := gcc
CXX := g++
#libs as
LIBS := -lpthread
LIBS +=
#compile flags
CFLAGS := -w -Wall -g -O0
CFLAGS += $(INC_DIR)
CXXFLAGS := -std=c++0x $(CFLAGS)
CFLAGS += -std=c99
#=========================================================
all: $(TARGET)
SEE:
@echo -e "SRC_FILE: $(SRC_FILE)"
@echo -e "OBJS: $(OBJS)"
$(TARGET):$(OBJS)
@$(CC) $(CFLAGS) -o $@ $^ $(LIBS)
@echo -e "\033[31m\033[1m make $@ done. \033[0m"; #red
%.o:%.c
@$(CC) $(CFLAGS) -c $^ -o $@
@echo -e "\033[32m\033[1m make $@ done. \033[0m"; #green
%.o:%.cpp
@$(CXX) $(CXXFLAGS) -c $^ -o $@
@echo -e "\033[32m\033[1m make $@ done. \033[0m";#green
clean:
@rm -f $(TARGET])
@echo -e "\033[31m\033[1m remove $(TARGET) done. \033[0m"; #red
cleanall:
@rm -f $(TARGET)
@rm -f $(OBJS)
@echo -e "\033[31m\033[1m Removed $(TARGET) done. \033[0m"; #red
@echo -e "\033[32m\033[1m Removed: $(OBJS) done. \033[0m"; #yellow
install:
@$(shell rm -f /usr/bin/httpd-2018*)
@echo -e "Removed the old version"
@$(shell cp $(TARGET) /usr/bin/$(TARGET))
@$(shell cp ./httpd_test.conf /etc/httpd_test.conf)
@echo -e "\033[32m\033[1m copy $(TARGET) to /usr/bin/$(TARGET) \033[0m"; #green
@echo -e "\033[32m\033[1m copy httpd_test.conf to /etc/httpd_test.conf \033[0m"; #green
4.3 配置文件
#--------------------------------------------
# Copyright @ 2018-04-17
# This is httpd configure file
# Autor: JImmy_Nie
#--------------------------------------------
home_dir=/var
ip_addr #use the local ip address
port_no=80
backlog=8
4.4 一些结构体定义
#include <linux/if.h>
/*
* Interface request structure used for socket
* ioctl's. All interface ioctl's must have parameter
* definitions which begin with ifr_name. The
* remainder may be interface specific.
*/
/* for compatibility with glibc net/if.h */
#if __UAPI_DEF_IF_IFREQ
struct ifreq {
#define IFHWADDRLEN 6
union
{
char ifrn_name[IFNAMSIZ]; /* if name, e.g. "en0" */
} ifr_ifrn;
union {
struct sockaddr ifru_addr;
struct sockaddr ifru_dstaddr;
struct sockaddr ifru_broadaddr;
struct sockaddr ifru_netmask;
struct sockaddr ifru_hwaddr;
short ifru_flags;
int ifru_ivalue;
int ifru_mtu;
struct ifmap ifru_map;
char ifru_slave[IFNAMSIZ]; /* Just fits the size */
char ifru_newname[IFNAMSIZ];
void * ifru_data;
struct if_settings ifru_settings;
} ifr_ifru;
};
#endif /* __UAPI_DEF_IF_IFREQ */
#define ifr_name ifr_ifrn.ifrn_name /* interface name */
#define ifr_hwaddr ifr_ifru.ifru_hwaddr /* MAC address */
#define ifr_addr ifr_ifru.ifru_addr /* address */
#define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-p lnk */
#define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */
#define ifr_netmask ifr_ifru.ifru_netmask /* interface net mask */
#define ifr_flags ifr_ifru.ifru_flags /* flags */
#define ifr_metric ifr_ifru.ifru_ivalue /* metric */
#define ifr_mtu ifr_ifru.ifru_mtu /* mtu */
#define ifr_map ifr_ifru.ifru_map /* device map */
#define ifr_slave ifr_ifru.ifru_slave /* slave device */
#define ifr_data ifr_ifru.ifru_data /* for use by interface */
#define ifr_ifindex ifr_ifru.ifru_ivalue /* interface index */
#define ifr_bandwidth ifr_ifru.ifru_ivalue /* link bandwidth */
#define ifr_qlen ifr_ifru.ifru_ivalue /* Queue length */
#define ifr_newname ifr_ifru.ifru_newname /* New name */
#define ifr_settings ifr_ifru.ifru_settings /* Device/proto settings*/
#include <sys/stat.h>
struct stat {
dev_t st_dev; /* ID of device containing file */
ino_t st_ino; /* inode number */
mode_t st_mode; /* protection */
nlink_t st_nlink; /* number of hard links */
uid_t st_uid; /* user ID of owner */
gid_t st_gid; /* group ID of owner */
dev_t st_rdev; /* device ID (if special file) */
off_t st_size; /* total size, in bytes */
blksize_t st_blksize; /* blocksize for filesystem I/O */
blkcnt_t st_blocks; /* number of 512B blocks allocated */
/* Since Linux 2.6, the kernel supports nanosecond
precision for the following timestamp fields.
For the details before Linux 2.6, see NOTES. */
struct timespec st_atim; /* time of last access */
struct timespec st_mtim; /* time of last modification */
struct timespec st_ctim; /* time of last status change */
#define st_atime st_atim.tv_sec /* Backward compatibility */
#define st_mtime st_mtim.tv_sec
#define st_ctime st_ctim.tv_sec
};
#include <dirent.h>
struct dirent {
ino_t d_ino; /* inode number */
off_t d_off; /* not an offset; see NOTES */
unsigned short d_reclen; /* length of this record */
unsigned char d_type; /* type of file; not supported
by all filesystem types */
char d_name[256]; /* filename */
};