Linux 用libevent实现的简单http服务器
<p>Linux 用libevent实现的简单http服务器</p><p>main.c</p>
<pre><code class="language-c">#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
#include "libev.h"
#include <string.h>
#include <event2/event.h>
#include <event2/bufferevent.h>
#include <event2/listener.h>
int main(int argc, char** argv){
// 端口
int port = atoi(argv);
// 修改进程的工作目录, 方便后续操作
int ret = chdir(argv);
if(ret == -1){
perror("chdir error");
exit(1);
}
struct event_base* base = NULL;
base = event_base_new();
if(base == NULL){
perror("event_base_new");
exit(1);
}
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
struct evconnlistener* lis =
evconnlistener_new_bind(base, listencb, base, LEV_OPT_CLOSE_ON_FREE | LEV_OPT_REUSEABLE, -1, (struct sockaddr*)&addr, sizeof(addr));
if(!lis){
perror("evconnlistener_new_bind");
exit(1);
}
event_base_dispatch(base);
event_base_free(base);
}
</code></pre>
<p>libev.h</p>
<pre><code class="language-c">#ifndef __LIBEV__
#define __LIBEV__
#include <event2/bufferevent.h>
#include <event2/listener.h>
void listencb(struct evconnlistener* listener, evutil_socket_t fd,
struct sockaddr* cli, int len, void* ptr);
void readcb(struct bufferevent* bev,void* ctx);
void writecb (struct bufferevent* bev,void* ctx);
void eventcb (struct bufferevent* bev,short what,void* ctx);
#endif
</code></pre>
<p>libev.c</p>
<pre><code class="language-c">#include "libev.h"
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "libev.h"
#include <event2/event.h>
#include <event2/bufferevent.h>
#include <event2/buffer.h>
#include <string.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
// 通过文件名获取文件的类型
const char *get_file_type(const char *name){
char* dot;
// 自右向左查找‘.’字符, 如不存在返回NULL
dot = strrchr(name, '.');
if (dot == NULL)
return "text/plain; charset=utf-8";
if (strcmp(dot, ".html") == 0 || strcmp(dot, ".htm") == 0)
return "text/html; charset=utf-8";
if (strcmp(dot, ".jpg") == 0 || strcmp(dot, ".jpeg") == 0)
return "image/jpeg";
if (strcmp(dot, ".gif") == 0)
return "image/gif";
if (strcmp(dot, ".png") == 0)
return "image/png";
if (strcmp(dot, ".css") == 0)
return "text/css";
if (strcmp(dot, ".au") == 0)
return "audio/basic";
if (strcmp( dot, ".wav" ) == 0)
return "audio/wav";
if (strcmp(dot, ".avi") == 0)
return "video/x-msvideo";
if (strcmp(dot, ".mov") == 0 || strcmp(dot, ".qt") == 0)
return "video/quicktime";
if (strcmp(dot, ".mpeg") == 0 || strcmp(dot, ".mpe") == 0)
return "video/mpeg";
if (strcmp(dot, ".vrml") == 0 || strcmp(dot, ".wrl") == 0)
return "model/vrml";
if (strcmp(dot, ".midi") == 0 || strcmp(dot, ".mid") == 0)
return "audio/midi";
if (strcmp(dot, ".mp3") == 0)
return "audio/mpeg";
if (strcmp(dot, ".ogg") == 0)
return "application/ogg";
if (strcmp(dot, ".pac") == 0)
return "application/x-ns-proxy-autoconfig";
return "text/plain; charset=utf-8";
}
// 16进制数转化为10进制
int hexit(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
return 0;
}
/*
*这里的内容是处理%20之类的东西！是"解码"过程。
*%20 URL编码中的‘ ’(space)
*%21 '!' %22 '"' %23 '#' %24 '$'
*%25 '%' %26 '&' %27 ''' %28 '('......
*相关知识html中的‘ ’(space)是&nbsp
*/
void encode_str(char* to, int tosize, const char* from)
{
int tolen;
for (tolen = 0; *from != '\0' && tolen + 4 < tosize; ++from)
{
if (isalnum(*from) || strchr("/_.-~", *from) != (char*)0)
{
*to = *from;
++to;
++tolen;
}
else
{
sprintf(to, "%%%02x", (int) *from & 0xff);
to += 3;
tolen += 3;
}
}
*to = '\0';
}
void decode_str(char *to, char *from)
{
for ( ; *from != '\0'; ++to, ++from)
{
if (from == '%' && isxdigit(from) && isxdigit(from))
{
*to = hexit(from)*16 + hexit(from);
from += 2;
}
else
{
*to = *from;
}
}
*to = '\0';
}
void listencb(struct evconnlistener* listener, evutil_socket_t fd,
struct sockaddr* cli, int len, void* ptr){
struct event_base* base = ptr;
struct bufferevent* bev =
bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE);
//set callback
bufferevent_setcb(bev, readcb, writecb, eventcb, NULL);
bufferevent_enable(bev, EV_READ | EV_WRITE);
}
// 断开连接的函数
void disconnect(struct bufferevent* bev){
bufferevent_disable(bev, EV_READ | EV_WRITE);
}
void send_respond_head(struct bufferevent* bev, int no, const char* desp, const char* type, long len){
char buf = {0};
// 状态行
sprintf(buf, "http/1.1 %d %s\r\n", no, desp);
bufferevent_write(bev, buf, strlen(buf));
// 消息报头
memset(buf, 0, sizeof buf);
sprintf(buf, "Content-Type:%s\r\n", type);
sprintf(buf+strlen(buf), "Content-Length:%ld\r\n", len);
bufferevent_write(bev, buf, strlen(buf));
// 空行
bufferevent_write(bev, "\r\n", 2);
}
void send_file(struct bufferevent* bev, const char* path){
int fd = open(path, O_RDONLY);
if(fd == -1){
//todo 404
perror("open err");
exit(1);
}
char buf;
int ret = 0;
while((ret = read(fd, buf, sizeof buf)) > 0){
bufferevent_write(bev, buf, ret);
}
if(ret == -1){
perror("read err");
exit(1);
}
close(fd);
}
void send_dir(struct bufferevent* bev, const char* path){
char file = {0};
char buf = {0};
sprintf(buf, "<html><head><title>目录名: %s</title></head>", path);
sprintf(buf+strlen(buf), "<body><h1>当前目录: %s</h1><table>", path);
#if 1
DIR* dir = opendir(path);
if(dir == NULL){
perror("opendir error");
exit(1);
}
// 读目录
char enstr = {0};
struct dirent* ptr = NULL;
while((ptr = readdir(dir)) != NULL){
char* name = ptr->d_name;
// 拼接文件的完整路径
sprintf(file, "%s/%s", path, name);
encode_str(enstr, sizeof(enstr), name);
struct stat st;
int ret = stat(file, &st);
if(ret == -1){
perror("stat err");
exit(1);
}
// 如果是文件
if(S_ISREG(st.st_mode)){
sprintf(buf+strlen(buf),
"<tr><td><a href=\"%s\">%s</a></td><td>%ld</td></tr>",
enstr, name, (long)st.st_size);
}
// 如果是目录
else if(S_ISDIR(st.st_mode)){
sprintf(buf+strlen(buf),
"<tr><td><a href=\"%s/\">%s/</a></td><td>%ld</td></tr>",
enstr, name, (long)st.st_size);
}
bufferevent_write(bev, buf, strlen(buf));
memset(buf, 0, sizeof(buf));
}
sprintf(buf+strlen(buf), "</table></body></html>");
bufferevent_write(bev, buf, strlen(buf));
closedir(dir);
#endif
}
void http_get_request(const char* line, struct bufferevent* bev){
char method = {0};
char res = {0};
sscanf(line, "%[^ ] %[^ ]", method, res);
// 转码 将不能识别的中文乱码 - > 中文
// 解码 %23 %34 %5f
char destr;
decode_str(destr, res);
// 处理path/xx
// 去掉path中的/
char* file = destr + 1;
char fbuf;
if(strcmp(res, "/") == 0){
file = "./";
//getcwd(fbuf, sizeof(fbuf));
//printf("root:[%s]\n", fbuf);
// file = fbuf;
}
struct stat st;
printf("file:[%s]\n", file);
int ret = stat(file, &st);
if(ret == -1){
//todo 404
perror("stat error");
exit(1);
}
if(S_ISDIR(st.st_mode)){
//dir
// 发送头信息
send_respond_head(bev, 200, "OK", get_file_type(".html"), 100000);
send_dir(bev, file);
}
else if(S_ISREG(st.st_mode)){
//reg file
send_respond_head(bev, 200, "OK", get_file_type(file), st.st_size);
send_file(bev, file);
}
}
void readcb(struct bufferevent* bev,void* ctx){
struct evbuffer* evbuf = bufferevent_get_input(bev);
char* line;
size_t len;
line = evbuffer_readln(evbuf, &len, EVBUFFER_EOL_CRLF);
/*
char* tmp = line;
while(1){
tmp = evbuffer_readln(evbuf, &len, EVBUFFER_EOL_CRLF);
if(tmp) break;
printf("%s\n", tmp);
}
printf("line:[%s]", line);
*/
if(strncasecmp("get", line, 3) == 0){
http_get_request(line, bev);
//disconnect(bev);
}
}
void writecb (struct bufferevent* bev,void* ctx){
}
void eventcb (struct bufferevent* bev,short what,void* ctx){
}
</code></pre>
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来源：https://www.cnblogs.com/xiaoshiwang/p/11159368.html
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