epoll实现web服务器
来源：互联网 发布：魔兽世界网络卡顿 编辑：程序博客网 时间：2024/05/16 19:27
#include<assert.h>#include<pthread.h>#include<errno.h>#define _DEF_PAGE_ "index.html"#define _SIZE_ 1024typedef struct bf{ char _buf[_SIZE_]; int _fd; int _cgi; char _method[_SIZE_/2]; char _path[_SIZE_]; union { char* _query_string; int _st_size; };}bf_t,*bf_p;void printLog(const char* const str,const char* const fun,int line);void usage(const char* const proc);int startup(char* ip,int port);void echo_error(int sock,int eno);int get_line(int sock,char* buf,int size);void clear_head(int sock);void execute_cgi(bf_p bf);void echo_html(bf_p bf); void accept_request(void* ptr); #include"http.h" void printLog(const char* const str,const char* const fun,int line){ printf("%s:%s:%d\n",str,fun,line);}void usage(const char* const proc){ assert(proc); printLog(proc,__FUNCTION__,__LINE__);}int startup(char* ip,int port){ assert(ip); int sock=socket(AF_INET,SOCK_STREAM,0); if(sock<0) { printLog(strerror(errno),__FUNCTION__,__LINE__); exit(1); } int opt=1; setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt)); struct sockaddr_in local; local.sin_family=AF_INET; local.sin_port=htons(port); if(strncmp(ip,"any",3)==0) { local.sin_addr.s_addr= INADDR_ANY; } else { local.sin_addr.s_addr=inet_addr(ip); } if(bind(sock,(struct sockaddr*)&local,sizeof(local))<0) { printLog(strerror(errno),__FUNCTION__,__LINE__); exit(1); } if(listen(sock,5)<0) { printLog(strerror(errno),__FUNCTION__,__LINE__); exit(1); } return sock;}void response_err(int sock,int eno){ char state_line[_SIZE_]; char err_des[30];//error description memset(state_line,'\0',sizeof(state_line)); memset(err_des,'\0',sizeof(err_des)); switch(eno) { case 404: strcpy(err_des,"Not Found"); break; default: break; } sprintf(state_line,"HTTP/1.0 %d %s\r\n\r\n",eno,err_des); send(sock,state_line,strlen(state_line),0);}void echo_error(int sock,int eno){ switch(eno) { case 404: response_err(sock,eno); break; case 403: break; default: break; } return;}int get_line(int sock,char* buf,int size){ assert(buf); int i=0; ssize_t _s=-1; char ch='\0'; while(i<size-1&&ch!='\n') { _s=recv(sock,&ch,1,0); if(_s) { if(ch=='\r') { if((_s=recv(sock,&ch,1,MSG_PEEK))) { if(_s>0&&ch=='\n') recv(sock,&ch,1,0); } } buf[i++]=ch; } else { buf[i++]='\n'; break; } }// printf("endddddddddddd"); buf[i]='\0'; return i;}void clear_head(int sock){ char buf[_SIZE_]; buf[0]='\0'; ssize_t _s=1; while(_s>0&&strcmp(buf,"\n")!=0) { _s=get_line(sock,buf,sizeof(buf)); }}void execute_cgi(bf_p bf){ int content_len=0;//post method content-length ssize_t _s=-1; char buf[_SIZE_]; char method_env[30]; char query_env[_SIZE_]; char content_len_env[30]; memset(buf,'\0',sizeof(buf)); memset(method_env,'\0',sizeof(method_env)); memset(query_env,'\0',sizeof(query_env)); memset(content_len_env,'\0',sizeof(content_len_env)); //if method=get,query_string not null,if method=post,query_string is null sprintf(method_env,"REQUEST_METHOD=%s",bf->_method); putenv(method_env); //printf("method:%s,path:%s,query_string:%s\n",method,path,query_string); if(strcasecmp(bf->_method,"GET")==0) { sprintf(query_env,"QUERY_STRING=%s",bf->_query_string); putenv(query_env); } else { while((_s=get_line(bf->_fd,buf,sizeof(buf)))>1) { if(strncasecmp(buf,"Content-Length:",15)==0) { //printf("length::::::::::%s\n",buf); content_len=atoi(buf+15); // break;//not break!!!!!!!!!!!!!!! } } //printf("Content-Length:%d\n",content_len); sprintf(content_len_env,"CONTENT_LENGTH=%d",content_len); putenv(content_len_env); } //printf("ready env\n"); //ready pid_t id; int in_fds[2]; int out_fds[2]; if(pipe(in_fds)<0) { printLog(strerror(errno),__FUNCTION__,__LINE__); exit(1); } if(pipe(out_fds)<0) { printLog(strerror(errno),__FUNCTION__,__LINE__); exit(1); } if((id=fork())<0) { printLog(strerror(errno),__FUNCTION__,__LINE__); exit(1); } else if(id==0)//child { close(in_fds[1]); close(out_fds[0]); dup2(in_fds[0],0); dup2(out_fds[1],1); execl(bf->_path,bf->_path,NULL); close(in_fds[0]); close(out_fds[1]); } else//father { close(in_fds[0]); close(out_fds[1]); char vals[1024]; memset(vals,'\0',sizeof(vals)); ssize_t _s=-1; int index=0; char ch='0'; if(strcasecmp(bf->_method,"POST")==0) { while(index<content_len&&read(bf->_fd,&ch,1)>0) { vals[index++]=ch; } } // printf("%s\n",vals); write(in_fds[1],vals,strlen(vals)); // printf("ffffffffffff"); memset(bf->_buf,'\0',sizeof(bf->_buf)); char* status_line="HTTP/1.0 200 ok\r\n\r\n"; sprintf(bf->_buf,status_line,strlen(status_line)); // printf("response\n"); int i=strlen(bf->_buf); while(read(out_fds[0],&ch,1)>0) { bf->_buf[i++]=ch; } bf->_buf[i]='\0'; close(in_fds[1]); close(out_fds[0]); waitpid(id); }}void echo_html(bf_p bf){ char* status_line="HTTP/1.0 200 ok\r\n\r\n"; sprintf(bf->_buf,status_line,strlen(status_line)); //printf("%s!!!!!!!!!!!!!!!!\n",bf->_buf);}void accept_request(void* ptr){ bf_p bf=(bf_p)ptr; int ret=-1; int i=0,j=0; char url[_SIZE_]; memset(bf->_method,'\0',sizeof(bf->_method)); memset(bf->_buf,'\0',sizeof(bf->_buf)); memset(bf->_path,'\0',sizeof(bf->_path)); memset(url,'\0',sizeof(url)); if(get_line(bf->_fd,bf->_buf,sizeof(bf->_buf))==0) { printLog("errno",__FUNCTION__,__LINE__); return; } i=j=0; while('\0'!=bf->_buf[i]&&!isspace(bf->_buf[i])&&i<strlen(bf->_buf)&&j<sizeof(bf->_method)-1) { bf->_method[j]=bf->_buf[i];//get method ++i; ++j; } bf->_method[j]='\0'; //printf("method:%s\n",bf->_method); j=0; while('\0'!=bf->_buf[i]&&isspace(bf->_buf[i])) { ++i; } while('\0'!=bf->_buf[i]&&!isspace(bf->_buf[i])&&i<strlen(bf->_buf)&&j<sizeof(url)-1) { url[j]=bf->_buf[i]; ++j; ++i; } url[j]='\0'; //printf("url:%s\n",url); bf->_cgi=0; if(strcasecmp(bf->_method,"POST")!=0&&strcasecmp(bf->_method,"GET")!=0) { echo_error(bf->_fd,500); return; } bf->_query_string=NULL; if(strcasecmp(bf->_method,"POST")==0) { bf->_cgi=1; bf->_query_string=NULL; } if(strcasecmp(bf->_method,"GET")==0) { bf->_query_string=url; while(*bf->_query_string!='\0'&&*bf->_query_string!='?') { ++bf->_query_string; } //printf("query_string::::::::::::::::\n"); if(*bf->_query_string=='?') { *bf->_query_string='\0'; bf->_cgi=1; ++bf->_query_string; } } if(strcmp(url,"/")==0) sprintf(bf->_path,"htdocs%s",url); else strcpy(bf->_path,url+1); struct stat st; if(stat(bf->_path,&st)<0)//not exist { echo_error(bf->_fd,404); return; } else if(S_IFDIR&st.st_mode)//dir { if(strcmp(bf->_path,"htdocs/")!=0) strcpy(bf->_path,"htdocs/"); strcat(bf->_path,_DEF_PAGE_); } else if((st.st_mode&S_IXUSR)||(st.st_mode&S_IXGRP)||(st.st_mode&S_IXOTH)) { bf->_cgi=1; } //printf("%d:%s\n",bf->_cgi,bf->_path); if(bf->_cgi) { execute_cgi(bf); } else { clear_head(bf->_fd); bf->_st_size=st.st_size; echo_html(bf); }} //main.c#include"http.h" int main(int argc,char* argv[]){ if(argc!=3) { usage(argv[0]); return 1; } char* ip=argv[1]; int port=atoi(argv[2]); int listen_sock=startup(ip,port); struct sockaddr_in client; socklen_t len=sizeof(client); int epo_fd=epoll_create(256); if(epo_fd<0)//success:not 0 fd/error:-1 { printLog(strerror(errno),__FUNCTION__,__LINE__); return -1; } bf_p fd_bf=(bf_p)malloc(sizeof(bf_t)); memset(fd_bf->_buf,'\0',sizeof(fd_bf->_buf)); fd_bf->_fd=listen_sock; struct epoll_event ev; ev.events=EPOLLIN; ev.data.fd=listen_sock; if(epoll_ctl(epo_fd,EPOLL_CTL_ADD,listen_sock,&ev)<0)//success:0 fail:-1 { printLog(strerror(errno),__FUNCTION__,__LINE__); return -1; } struct epoll_event evfds[_SIZE_];//_SIZE_ 1024 int _timeout=5000; int ret=-1; int i=0; while(1) { switch((ret=epoll_wait(epo_fd,evfds,_SIZE_,_timeout))) { case -1://error printLog(strerror(errno),__FUNCTION__,__LINE__); break; case 0://time out printf("time out...\n"); break; default://normal { for(i=0;i<ret;++i) { if(evfds[i].data.fd==listen_sock&&evfds[i].events&EPOLLIN) { int new_sock=accept(listen_sock,(struct sockaddr*)&client,&len); if(new_sock<0) { printLog(strerror(errno),__FUNCTION__,__LINE__); continue; } bf_p _bf=(bf_p)malloc(sizeof( bf_t)); memset(_bf->_buf,'\0',sizeof(_bf->_buf)); _bf->_fd=new_sock; ev.events=EPOLLIN; ev.data.ptr=_bf; epoll_ctl(epo_fd,EPOLL_CTL_ADD,new_sock,&ev); } else if(((bf_p)(evfds[i].data.ptr))->_fd>0&&evfds[i].events&EPOLLIN) { accept_request(evfds[i].data.ptr); ev.events=EPOLLOUT; ev.data.ptr=evfds[i].data.ptr; epoll_ctl(epo_fd,EPOLL_CTL_MOD,((bf_p)(evfds[i].data.ptr))->_fd,&ev); } else if(((bf_p)(evfds[i].data.ptr))->_fd>0&&evfds[i].events&EPOLLOUT) { //printf("OOOOOOOOOOOOOOOut\n"); bf_p _bf=(bf_p)evfds[i].data.ptr; if(_bf->_cgi)//cgi=1 { send(_bf->_fd,_bf->_buf,strlen(_bf->_buf),0); } else { char* path=_bf->_path; int fd=open(path,O_RDONLY); if(fd<0) { printLog(strerror(errno),__FUNCTION__,__LINE__); exit(1); } send(_bf->_fd,_bf->_buf,strlen(_bf->_buf),0); if(sendfile(_bf->_fd,fd,NULL,_bf->_st_size)<0) { printf("error"); } close(fd); } epoll_ctl(epo_fd,EPOLL_CTL_DEL,_bf->_fd,NULL); close(_bf->_fd); free(_bf); } } break; } } } return 0;} 0 0
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