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httpd.c
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httpd.c
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/*************************************************************************
> File Name: ukey_httpd.c
> Author: Ukey
> Mail: [email protected]
> Created Time: 2017年06月07日 星期三 19时04分58秒
************************************************************************/
#include "httpd.h"
int epev_ralloc() {
int nep_events = g_manager.nep_events;
struct epoll_event *old_events = g_manager.ep_events;
ukey_pool_t *pool = g_manager.m_pool;
ukey_pool_large_t *old_large = NULL;
struct epoll_event *temp = NULL;
nep_events *= 2;
for (old_large = pool->large; old_large; old_large = old_large->next) {
if (old_large->alloc == (void *)old_events) {
break;
}
}
/* 未找到,返回-1 */
if (old_large == NULL) {
return -1;
}
temp = realloc(g_manager.ep_events, nep_events * sizeof(struct epoll_event));
if (temp == NULL) {
fprintf(stderr, "realloc event error\n");
return -1;
}
old_large->alloc = temp;
g_manager.ep_events = temp;
g_manager.nep_events = nep_events;
return 0;
}
void *accept_connect(void *arg)
{
int *sock_fd = (int *)arg;
struct sockaddr_in client_addr;
socklen_t client_len;
client_len = sizeof(client_addr);
int new_fd = accept(*sock_fd, (struct sockaddr* )&client_addr, &client_len);
if (new_fd < 0) {
perror("accept error");
}
conn_set(new_fd, EPOLLIN, (void *)process_conn);
return NULL;
}
//按行获取浏览器的request
static int get_line(int sock_fd, char *buf, int size)
{
int i = 0, n = 0;
char c = '\0';
while((i < size) && (c != '\n'))
{
n = 0;
while (n <= 0) {
n = recv(sock_fd, &c, 1, 0);
if (n == -1) {
if (errno != EAGAIN || errno != EWOULDBLOCK) {
break;
}
}
}
//printf("--------------c:%c\n", c);
if (n <= 0) {
perror("recv error:");
}
if(n > 0)
{
//这里主要的目的是读取请求数据时将http请求的回车换行符在我们的buf中换成换行
if(c == '\r')
{
//MSG_PEEK的作用是读取数据后,但是并不将读取的数据清出缓冲区,也就是说下次读的时候还在
n = recv(sock_fd, &c, 1, MSG_PEEK);
if((n > 0) && (c == '\n'))
{
int ret = 0;
while (ret <= 0) {
ret = recv(sock_fd, &c, 1, 0);
if (ret == -1) {
if (errno != EAGAIN || errno != EWOULDBLOCK)
break;
}
}
}
else
{
c = '\n';
}
}
buf[i] = c;
i++;
}
else
break;
}
buf[i] = '\0';
return i;
}
static void send_headers(int client_fd)
{
char buf[BUFF_SIZE];
sprintf(buf, "HTTP/1.0 200 OK\r\nServer: ukey_httpd/1.0\r\nContent-Type:text/html\r\n\r\n");
send(client_fd, buf, strlen(buf), 0);
}
static void not_found(int client_fd)
{
char buf[BUFF_SIZE];
sprintf(buf, "HTTP/1.0 404 NOT FOUND\r\nServer: ukey_httpd/1.0\r\nContent-Type:text/html\r\n\r\n");
send(client_fd, buf, strlen(buf), 0);
sprintf(buf, "<HTML><TITLE>404 not found</TITLE>\r\n<BODY><P>server can't find the source which you request\r\n</P></BODY></HTML>\r\n");
send(client_fd, buf, strlen(buf), 0);
}
static void permission_denied(int client_fd)
{
char buf[BUFF_SIZE];
sprintf(buf, "HTTP/1.0 403 PERMISSION DENIED\r\nServer: ukey_httpd/1.0\r\nContent-Type:text/html\r\n\r\n");
send(client_fd, buf, strlen(buf), 0);
sprintf(buf, "<HTML><TITLE>403 permission denied</TITLE>\r\n<BODY><P>you don't have enough permissions to view this file\r\n</P></BODY></HTML>\r\n");
send(client_fd, buf, strlen(buf), 0);
}
static void serve_file(int client_fd, const char *file_name)
{
int n = 1, fd;
char buf[BUFF_SIZE] = {0};
struct stat s;
while((n > 0) && strcmp(buf, "\n"))
{
n = get_line(client_fd, buf, sizeof(buf) - 1);
}
//判断文件是否存在
if((access(file_name, F_OK)) == -1)
{
not_found(client_fd);
}
else
{
fd = open(file_name, O_RDONLY);
//权限不足
if(errno == EACCES)
{
permission_denied(client_fd);
}
//否则回送静态文本数据
else
{
//使用mmap将文件映射到内存中
fstat(fd, &s);
int file_size = s.st_size;
char *p = (char *)mmap(NULL, file_size, PROT_READ, MAP_SHARED, fd, 0);
if(p == MAP_FAILED)
{
perror("mmap error");
exit(1);
}
send_headers(client_fd);
send(client_fd, p, file_size, 0);
munmap(p, file_size);
}
}
close(fd);
}
static void method_not_implemented(int client)
{
char buf[BUFF_SIZE];
sprintf(buf, "HTTP/1.0 501 Method Not Implemented\r\nServer: ukey_httpd/1.0\r\nContent-Type:text/html\r\n\r\n");
send(client, buf, strlen(buf), 0);
sprintf(buf, "<HTML><HEAD><TITLE>Method Not Implemented\r\n</TITLE></HEAD>\r\n<BODY><P>request method not support\r\n</P></BODY></HTML>\r\n");
send(client, buf, strlen(buf), 0);
}
static void bad_request(int client_fd)
{
char buf[BUFF_SIZE];
sprintf(buf, "HTTP/1.0 400 BAD REQUEST\r\nServer: ukey_httpd/1.0\r\nContent-type:text/html\r\n\r\n");
send(client_fd, buf, strlen(buf), 0);
sprintf(buf, "<HTML><HEAD><TITLE>400 BAD REQUEST</TITLE></HEAD><BODY><P>this is a bad request for server</P></BODY></HTML>");
send(client_fd, buf, strlen(buf), 0);
}
static void cannot_execute(int client_fd)
{
char buf[BUFF_SIZE];
sprintf(buf, "HTTP/1.0 500 Server error\r\nServer: ukey_httpd/1.0\r\nContent-type:text/html\r\n\r\n");
send(client_fd, buf, strlen(buf), 0);
sprintf(buf, "<HTML><HEAD><TITLE>500 SERVER ERROR</TITLE></HEAD><BODY><P>SERVER ERROR</P></BODY></HTML>");
send(client_fd, buf, strlen(buf), 0);
}
static void execute_cgi(int client_fd, const char *path, const char *method, const char *query_string)
{
char buf[BUFF_SIZE], c;
int cgi_output[2];
int cgi_input[2];
int i, status;
int n = 1, content_length = -1;
pid_t pid;
//GET请求
if(!strcasecmp(method, "GET"))
{
while((n > 0) && strcmp(buf, "\n"))
{
n = get_line(client_fd, buf, sizeof(buf) - 1);
}
}
//POST请求
else
{
n = get_line(client_fd, buf, sizeof(buf) - 1);
while((n > 0) && (strcmp(buf, "\n")))
{
buf[15] = '\0';
if(!strcasecmp(buf, "Content-Length:"))
{
content_length = atoi(&(buf[16]));
}
n = get_line(client_fd, buf, sizeof(buf) - 1);
}
if(content_length == -1)
{
bad_request(client_fd);
return ;
}
}
if(pipe(cgi_output) < 0)
{
cannot_execute(client_fd);
return ;
}
if(pipe(cgi_input) < 0)
{
cannot_execute(client_fd);
return ;
}
sprintf(buf, "HTTP/1.0 200 OK\r\n");
send(client_fd, buf, strlen(buf), 0);
if((pid = fork()) < 0)
{
cannot_execute(client_fd);
return ;
}
if(pid == 0)
{
char meth_env[ARG_SIZE];
char query_env[ARG_SIZE];
char length_env[ARG_SIZE];
close(cgi_output[0]);
close(cgi_input[1]);
if(dup2(cgi_output[1], STDOUT_FILENO) == -1)
{
perror("dup2 out error");
exit(1);
}
if(dup2(cgi_input[0], STDIN_FILENO) == -1)
{
perror("dup2 in error");
exit(1);
}
sprintf(meth_env, "REQUEST_METHOD=%s", method);
//设置环境变量
putenv(meth_env);
if(!strcasecmp(method, "GET"))
{
sprintf(query_env, "QUERY_STRING=%s", query_string);
putenv(query_env);
}
else
{
sprintf(length_env, "CONTENT_LENGTH=%d", content_length);
putenv(length_env);
}
execl(path, path, (char *)0);
exit(0);
}
else
{
close(cgi_output[1]);
close(cgi_input[0]);
if(!strcasecmp(method, "POST"))
{
for(i = 0; i < content_length; i++)
{
recv(client_fd, &c, 1, 0);
write(cgi_input[1], &c, 1);
}
}
while(read(cgi_output[0], &c, 1) > 0)
{
send(client_fd, &c, 1, 0);
}
close(cgi_output[0]);
close(cgi_input[1]);
waitpid(pid, &status, 0);
}
}
void *work_request(void *arg)
{
int *work_fd = (int*)arg;
char buf[BUFF_SIZE];
char method[ARG_SIZE];
char url[ARG_SIZE];
char path[512];
char *query_string = NULL;
size_t n, i = 0, j = 0;
int cgi_flag = 0;
struct stat s;
n = get_line(*work_fd, buf, sizeof(buf) - 1);
while((i < sizeof(method) - 1) && (!isspace(buf[i])))
{
method[i] = buf[i];
i++;
}
method[i] = '\0';
j = i;
if(strcasecmp(method, "GET") && strcasecmp(method, "POST"))
{
method_not_implemented(*work_fd);
return NULL;
}
//跳过空格字符
while(isspace(buf[j]) && (j < n))
{
j++;
}
i = 0;
//获取url
while(!isspace(buf[j]) && (i < sizeof(url) - 1) && (j < n))
{
url[i] = buf[j];
i++;
j++;
}
url[i] = '\0';
if(!strcasecmp(method, "POST"))
{
cgi_flag = 1;
}
else
{
query_string = url;
while((*query_string != '?') && (*query_string != '\0'))
{
query_string++;
}
if(*query_string == '?')
{
cgi_flag = 1;
*query_string = '\0';
query_string++;
}
}
sprintf(path, "htdocs%s", url);
if(path[strlen(path) - 1] == '/')
{
strcat(path, "index.html");
}
if(stat(path, &s) == -1)
{
while((n > 0) && strcmp(buf, "\n"))
{
n = get_line(*work_fd, buf, sizeof(buf) - 1);
not_found(*work_fd);
}
}
else
{
if(S_ISDIR(s.st_mode))
{
strcat(path, "/index.html");
}
if((s.st_mode & S_IXUSR) || (s.st_mode & S_IXGRP) || (s.st_mode & S_IXOTH))
{
cgi_flag = 1;
}
if(!cgi_flag)
{
serve_file(*work_fd, path);
}
else
{
execute_cgi(*work_fd, path, method, query_string);
}
}
pthread_mutex_lock(&(g_manager.conn_lock));
conn_free(*work_fd);
close(*work_fd);
pthread_mutex_unlock(&(g_manager.conn_lock));
return NULL;
}
void add_conn(int listen_fd, int events, void *arg) {
int *sock_fd = (int *)ukey_palloc(g_manager.m_pool, sizeof(int));
*sock_fd = listen_fd;
threadpool_add(g_manager.t_pool, accept_connect, (void *)sock_fd);
}
void process_conn(int sock_fd, int events, void *arg) {
int *fd = (int *)ukey_palloc(g_manager.m_pool, sizeof(int));
*fd = sock_fd;
threadpool_add(g_manager.t_pool, work_request, (void *)fd);
}
int manager_init() {
g_manager.m_pool = ukey_create_pool(2048);
g_manager.t_pool = threadpool_create(50, 1024, 1024);
g_manager.conn = (connections_t *)ukey_palloc(g_manager.m_pool, sizeof(connections_t ) * 1024);
g_manager.nconnections = 1024;
conn_init(g_manager.conn, g_manager.nconnections);
g_manager.ep_fd = epoll_create(EPOLL_SIZE);
if (g_manager.ep_fd < 0) {
perror("epoll create error");
return -1;
}
g_manager.ep_events = (struct epoll_event *)ukey_palloc(g_manager.m_pool, sizeof(struct epoll_event) * 4096);
g_manager.nep_events = 4096;
pthread_mutex_init(&(g_manager.conn_lock), NULL);
return 0;
}
void manager_destroy() {
close(g_manager.ep_fd);
int i;
for (i = 0; i < g_manager.nconnections; i++) {
ukey_destroy_pool(g_manager.conn[i].m_cpool);
}
threadpool_destroy(g_manager.t_pool);
ukey_destroy_pool(g_manager.m_pool);
}