mirror of
https://bitbucket.org/jsuto/piler.git
synced 2024-12-24 19:30:12 +01:00
initial release of an epoll version
Change-Id: I53bf6621abdbfeb6b5d5f22c2aa632d29c48441b Signed-off-by: SJ <sj@acts.hu>
This commit is contained in:
SJ
parent
2e5ddbaef5
commit
1c941a6433
@ -110,7 +110,7 @@ void sanitiseBase64(char *s){
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}
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inline void pack_4_into_3(char *s, char *s2){
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inline static void pack_4_into_3(char *s, char *s2){
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int j, n[4], k1, k2;
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memset(s2, 0, 3);
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@ -376,6 +376,7 @@ struct smtp_session {
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char remote_host[INET6_ADDRSTRLEN];
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time_t lasttime;
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int protocol_state;
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int slot;
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int fd;
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int bad;
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int buflen;
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62
src/misc.c
62
src/misc.c
@ -645,6 +645,68 @@ void *get_in_addr(struct sockaddr *sa){
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}
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int make_socket_non_blocking(int fd){
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int flags, s;
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flags = fcntl(fd, F_GETFL, 0);
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if(flags == -1){
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return -1;
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}
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flags |= O_NONBLOCK;
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s = fcntl(fd, F_SETFL, flags);
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if(s == -1){
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return -1;
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}
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return 0;
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}
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int create_and_bind(char *listen_addr, int listen_port){
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struct addrinfo hints;
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struct addrinfo *result, *rp;
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char port_string[8];
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int rc, fd;
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memset(&hints, 0, sizeof (struct addrinfo));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags = AI_PASSIVE;
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snprintf(port_string, sizeof(port_string)-1, "%d", listen_port);
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rc = getaddrinfo(listen_addr, port_string, &hints, &result);
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if(rc != 0){
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syslog(LOG_PRIORITY, "getaddrinfo for '%s': %s", listen_addr, gai_strerror(rc));
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return -1;
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}
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for(rp = result; rp != NULL; rp = rp->ai_next){
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fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
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if(fd == -1)
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continue;
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rc = bind(fd, rp->ai_addr, rp->ai_addrlen);
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if(rc == 0){
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break;
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}
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close(fd);
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}
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if(rp == NULL){
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syslog(LOG_PRIORITY, "cannot bind to port: %s:%d", listen_addr, listen_port);
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return -1;
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}
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freeaddrinfo(result);
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return fd;
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}
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int can_i_write_current_directory(){
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int fd;
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char filename[SMALLBUFSIZE];
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@ -44,6 +44,8 @@ int read_from_stdin(struct session_data *sdata);
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void strtolower(char *s);
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void *get_in_addr(struct sockaddr *sa);
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int make_socket_non_blocking(int fd);
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int create_and_bind(char *listen_addr, int listen_port);
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int can_i_write_current_directory();
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341
src/piler-smtp.c
341
src/piler-smtp.c
@ -14,7 +14,7 @@
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#include <pwd.h>
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#include <sys/ioctl.h>
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#include <signal.h>
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#include <poll.h>
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#include <sys/epoll.h>
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#include <netinet/in.h>
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#include <locale.h>
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#include <errno.h>
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@ -29,10 +29,10 @@
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extern char *optarg;
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extern int optind;
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struct pollfd *poll_set=NULL;
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struct epoll_event event, *events=NULL;
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int timeout = 20; // checking for timeout this often [sec]
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int numfds = 0;
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int num_connections = 0;
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int listenerfd = -1;
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char *configfile = CONFIG_FILE;
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@ -105,7 +105,9 @@ void handle_data(struct smtp_session *session, char *readbuf, int readlen){
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}
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void init_smtp_session(struct smtp_session *session, int fd_index, int sd){
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void init_smtp_session(struct smtp_session *session, int slot, int sd){
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session->slot = slot;
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session->socket = sd;
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session->buflen = 0;
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session->protocol_state = SMTP_STATE_INIT;
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@ -148,13 +150,12 @@ void p_clean_exit(){
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if(listenerfd != -1) close(listenerfd);
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for(i=1; i<numfds; i++){
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close(poll_set[i].fd);
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free_smtp_session(sessions[i]);
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for(i=0; i<cfg.max_connections; i++){
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if(sessions[i]) free_smtp_session(sessions[i]);
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}
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if(sessions) free(sessions);
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if(poll_set) free(poll_set);
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if(events) free(events);
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syslog(LOG_PRIORITY, "%s has been terminated", PROGNAME);
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@ -172,23 +173,37 @@ void fatal(char *s){
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}
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void tear_down_client(int n){
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int get_session_slot(){
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int i;
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close(poll_set[n].fd);
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poll_set[n].events = 0;
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syslog(LOG_PRIORITY, "disconnected from %s", sessions[n]->remote_host);
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free_smtp_session(sessions[n]);
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sessions[n] = NULL;
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for(i=n; i<numfds; i++){
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poll_set[i] = poll_set[i+1];
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sessions[i] = sessions[i+1];
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for(i=0; i<cfg.max_connections; i++){
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if(sessions[i] == NULL) return i;
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}
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numfds--;
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return -1;
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}
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struct smtp_session *get_session_by_socket(int socket){
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int i;
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for(i=0; i<cfg.max_connections; i++){
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if(sessions[i] && sessions[i]->socket == socket) return sessions[i];
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}
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return NULL;
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}
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void tear_down_client(int slot){
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syslog(LOG_PRIORITY, "disconnected from %s", sessions[slot]->remote_host);
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close(sessions[slot]->socket);
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free_smtp_session(sessions[slot]);
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sessions[slot] = NULL;
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num_connections--;
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}
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@ -196,13 +211,13 @@ void check_for_client_timeout(){
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time_t now;
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int i;
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if(numfds > 1){
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if(num_connections > 0){
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time(&now);
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for(i=1; i<numfds; i++){
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if(now - sessions[i]->lasttime >= cfg.smtp_timeout){
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for(i=0; i<cfg.max_connections; i++){
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if(sessions[i] && now - sessions[i]->lasttime >= cfg.smtp_timeout){
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syslog(LOG_PRIORITY, "client %s timeout", sessions[i]->remote_host);
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tear_down_client(i);
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tear_down_client(sessions[i]->slot);
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}
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}
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}
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@ -230,99 +245,52 @@ int is_blocked_by_tcp_wrappers(int sd){
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#endif
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int create_listener_socket(char *listen_addr, int listen_port){
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int rc, sd, yes=1;
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char port_string[8];
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struct addrinfo hints, *res;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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snprintf(port_string, sizeof(port_string)-1, "%d", listen_port);
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if((rc = getaddrinfo(listen_addr, port_string, &hints, &res)) != 0){
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syslog(LOG_PRIORITY, "getaddrinfo for '%s': %s", listen_addr, gai_strerror(rc));
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return -1;
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}
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if((sd = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) == -1){
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syslog(LOG_PRIORITY, "socket() error");
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return -1;
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}
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if(setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1){
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syslog(LOG_PRIORITY, "setsockopt() error");
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close(sd);
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return -1;
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}
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if(ioctl(sd, FIONBIO, (char *)&yes) == -1){
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syslog(LOG_PRIORITY, "ioctl() failed");
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close(sd);
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return -1;
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}
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if(bind(sd, res->ai_addr, res->ai_addrlen) == -1){
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syslog(LOG_PRIORITY, "cannot bind to port: %s:%d", listen_addr, listen_port);
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close(sd);
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return -1;
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}
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freeaddrinfo(res);
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if(listen(sd, cfg.backlog) == -1){
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syslog(LOG_PRIORITY, "listen() error");
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close(sd);
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return -1;
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}
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return sd;
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}
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void start_new_session(int socket, struct sockaddr_storage client_address, int fd_index){
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char smtp_banner[SMALLBUFSIZE], remote_host[INET6_ADDRSTRLEN];
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int start_new_session(int socket){
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char smtp_banner[SMALLBUFSIZE];
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int slot;
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// Uh-oh! We have enough connections to serve already
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if(numfds >= cfg.max_connections){
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inet_ntop(client_address.ss_family, get_in_addr((struct sockaddr*)&client_address), remote_host, sizeof(remote_host));
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syslog(LOG_PRIORITY, "too many connections (%d), cannot accept %s", numfds, remote_host);
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if(num_connections >= cfg.max_connections){
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syslog(LOG_PRIORITY, "too many connections (%d), cannot accept socket %d", num_connections, socket);
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send(socket, SMTP_RESP_421_ERR_ALL_PORTS_ARE_BUSY, strlen(SMTP_RESP_421_ERR_ALL_PORTS_ARE_BUSY), 0);
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close(socket);
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return;
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return -1;
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}
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#ifdef HAVE_LIBWRAP
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if(is_blocked_by_tcp_wrappers(socket) == 1){
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close(socket);
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return;
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return -1;
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}
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#endif
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sessions[numfds] = malloc(sizeof(struct smtp_session));
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slot = get_session_slot();
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if(sessions[numfds] == NULL){
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syslog(LOG_PRIORITY, "malloc error()");
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send(socket, SMTP_RESP_421_ERR_TMP, strlen(SMTP_RESP_421_ERR_TMP), 0);
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close(socket);
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return;
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syslog(LOG_PRIORITY, "INFO: found slot: %d", slot);
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if(slot >= 0 && sessions[slot] == NULL){
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sessions[slot] = malloc(sizeof(struct smtp_session));
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if(sessions[slot]){
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init_smtp_session(sessions[slot], slot, socket);
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snprintf(smtp_banner, sizeof(smtp_banner)-1, SMTP_RESP_220_BANNER, cfg.hostid);
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send(socket, smtp_banner, strlen(smtp_banner), 0);
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num_connections++;
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return 0;
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}
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else {
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syslog(LOG_PRIORITY, "ERROR: malloc() in start_new_session()");
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}
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}
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else {
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syslog(LOG_PRIORITY, "ERROR: couldn't find a slot for the connection");
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}
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send(socket, SMTP_RESP_421_ERR_TMP, strlen(SMTP_RESP_421_ERR_TMP), 0);
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close(socket);
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init_smtp_session(sessions[numfds], fd_index, socket);
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snprintf(smtp_banner, sizeof(smtp_banner)-1, SMTP_RESP_220_BANNER, cfg.hostid);
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send(socket, smtp_banner, strlen(smtp_banner), 0);
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inet_ntop(client_address.ss_family, get_in_addr((struct sockaddr*)&client_address), sessions[numfds]->remote_host, INET6_ADDRSTRLEN);
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syslog(LOG_PRIORITY, "connected from %s", sessions[numfds]->remote_host);
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poll_set[numfds].fd = socket;
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poll_set[numfds].events = POLLIN|POLLHUP;
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numfds++;
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return -1;
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}
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@ -352,12 +320,12 @@ void initialise_configuration(){
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int main(int argc, char **argv){
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int listenerfd, client_sockfd;
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int i, daemonise=0;
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int i, n, daemonise=0;
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int client_len = sizeof(struct sockaddr_storage);
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int readlen;
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int bytes_to_read;
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struct sockaddr_storage client_address;
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char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
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char readbuf[BIGBUFSIZE];
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int efd;
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while((i = getopt(argc, argv, "c:dvVh")) > 0){
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switch(i){
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@ -385,14 +353,28 @@ int main(int argc, char **argv){
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initialise_configuration();
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listenerfd = create_listener_socket(cfg.listen_addr, cfg.listen_port);
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listenerfd = create_and_bind(cfg.listen_addr, cfg.listen_port);
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if(listenerfd == -1){
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syslog(LOG_PRIORITY, "create_listener_socket() error");
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exit(1);
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}
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if(listen(listenerfd, cfg.backlog) == -1){
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fatal("ERROR: listen()");
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}
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if(drop_privileges(pwd)) fatal(ERR_SETUID);
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efd = epoll_create1(0);
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if(efd == -1){
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fatal("ERROR: epoll_create()");
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}
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event.data.fd = listenerfd;
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event.events = EPOLLIN | EPOLLET;
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if(epoll_ctl(efd, EPOLL_CTL_ADD, listenerfd, &event) == -1){
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fatal("ERROR: epoll_ctl() on efd");
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}
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set_signal_handler(SIGINT, p_clean_exit);
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set_signal_handler(SIGTERM, p_clean_exit);
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set_signal_handler(SIGALRM, check_for_client_timeout);
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@ -403,13 +385,9 @@ int main(int argc, char **argv){
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// calloc() initialitizes the allocated memory
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sessions = calloc(cfg.max_connections, sizeof(struct smtp_session));
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poll_set = calloc(cfg.max_connections, sizeof(struct pollfd));
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events = calloc(cfg.max_connections, sizeof(struct epoll_event));
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if(!sessions || !poll_set) fatal("calloc() error");
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poll_set[0].fd = listenerfd;
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poll_set[0].events = POLLIN;
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numfds = 1;
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if(!sessions || !events) fatal("ERROR: calloc()");
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SSL_library_init();
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SSL_load_error_strings();
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@ -423,55 +401,118 @@ int main(int argc, char **argv){
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#endif
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for(;;){
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int fd_index;
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poll(poll_set, numfds, -1);
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n = epoll_wait(efd, events, cfg.max_connections, -1);
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for(i=0; i<n; i++){
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for(fd_index = 0; fd_index < numfds; fd_index++){
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if(poll_set[fd_index].revents & POLLIN){
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if((events[i].events & EPOLLERR) || (events[i].events & EPOLLHUP) || (!(events[i].events & EPOLLIN))){
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syslog(LOG_PRIORITY, "ERROR: epoll error");
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close(events[i].data.fd);
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// we have to tear_down_client as well if not the listening socket?
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continue;
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}
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// process new connection
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// We have 1 or more incoming connections to process
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else if(listenerfd == events[i].data.fd){
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while(1){
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if(poll_set[fd_index].fd == listenerfd){
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client_sockfd = accept(listenerfd, (struct sockaddr *)&client_address, (socklen_t *)&client_len);
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start_new_session(client_sockfd, client_address, fd_index);
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if(client_sockfd == -1){
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if((errno == EAGAIN) || (errno == EWOULDBLOCK)){
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// We have processed all incoming connections
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break;
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}
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else {
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syslog(LOG_PRIORITY, "ERROR: accept()");
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break;
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}
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}
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if(getnameinfo((struct sockaddr *)&client_address, client_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) == 0){
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syslog(LOG_PRIORITY, "connected from %s:%s on descriptor %d", hbuf, sbuf, client_sockfd);
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}
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if(make_socket_non_blocking(client_sockfd) == -1){
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syslog(LOG_PRIORITY, "ERROR: cannot make the socket non blocking");
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break;
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}
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event.data.fd = client_sockfd;
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event.events = EPOLLIN | EPOLLET;
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if(epoll_ctl(efd, EPOLL_CTL_ADD, client_sockfd, &event) == -1){
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syslog(LOG_PRIORITY, "ERROR: epoll_ctl() on client_sockfd");
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break;
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}
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start_new_session(client_sockfd);
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}
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||||
|
||||
// handle data from an existing connection
|
||||
continue;
|
||||
}
|
||||
|
||||
else {
|
||||
ioctl(poll_set[fd_index].fd, FIONREAD, &bytes_to_read);
|
||||
|
||||
if(cfg.verbosity >= _LOG_DEBUG) syslog(LOG_PRIORITY, "got %d bytes to read", bytes_to_read);
|
||||
// handle data from an existing connection
|
||||
|
||||
if(bytes_to_read == 0){
|
||||
tear_down_client(fd_index);
|
||||
else {
|
||||
int done = 0;
|
||||
ssize_t count;
|
||||
|
||||
// should the following work here as well?
|
||||
// ioctl(events[i].data.fd, FIONREAD, &bytes_to_read);
|
||||
|
||||
session = get_session_by_socket(events[i].data.fd);
|
||||
if(session == NULL){
|
||||
syslog(LOG_PRIORITY, "ERROR: cannot find session for this socket: %d", events[i].data.fd);
|
||||
close(events[i].data.fd);
|
||||
continue;
|
||||
}
|
||||
|
||||
time(&(session->lasttime));
|
||||
|
||||
while(1){
|
||||
memset(readbuf, 0, sizeof(readbuf));
|
||||
|
||||
if(session->use_ssl == 1)
|
||||
count = SSL_read(session->ssl, (char*)&readbuf[0], sizeof(readbuf)-1);
|
||||
else
|
||||
count = read(events[i].data.fd, (char*)&readbuf[0], sizeof(readbuf)-1);
|
||||
|
||||
if(cfg.verbosity >= _LOG_DEBUG) syslog(LOG_PRIORITY, "got %ld bytes to read", count);
|
||||
|
||||
if(count == -1){
|
||||
/* If errno == EAGAIN, that means we have read all data. So go back to the main loop. */
|
||||
if(errno != EAGAIN){
|
||||
syslog(LOG_PRIORITY, "read");
|
||||
done = 1;
|
||||
}
|
||||
break;
|
||||
}
|
||||
else {
|
||||
session = sessions[fd_index];
|
||||
|
||||
time(&(session->lasttime));
|
||||
|
||||
// readbuf must be large enough to hold 'bytes_to_read' data
|
||||
// I think there shouldn't be more than MTU size data to be
|
||||
// read from the socket at a time
|
||||
memset(readbuf, 0, sizeof(readbuf));
|
||||
|
||||
if(session->use_ssl == 1)
|
||||
readlen = SSL_read(session->ssl, (char*)&readbuf[0], sizeof(readbuf)-1);
|
||||
else
|
||||
readlen = recv(poll_set[fd_index].fd, &readbuf[0], sizeof(readbuf)-1, 0);
|
||||
|
||||
if(readlen < 1) break;
|
||||
|
||||
readbuf[readlen] = '\0'; // we need either this or memset(readbuf, ...) above
|
||||
|
||||
handle_data(session, &readbuf[0], readlen);
|
||||
|
||||
if(session->protocol_state == SMTP_STATE_BDAT && session->bad == 1) tear_down_client(fd_index);
|
||||
else if(count == 0){
|
||||
/* End of file. The remote has closed the connection. */
|
||||
done = 1;
|
||||
break;
|
||||
}
|
||||
|
||||
handle_data(session, &readbuf[0], count);
|
||||
|
||||
if(session->protocol_state == SMTP_STATE_BDAT && session->bad == 1){
|
||||
tear_down_client(session->slot);
|
||||
done = 0; // to prevent the repeated tear down of connection
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if(done){
|
||||
printf("Closed connection on descriptor %d\n", events[i].data.fd);
|
||||
|
||||
/* Closing the descriptor will make epoll remove it from the set of descriptors which are monitored. */
|
||||
//close(events[i].data.fd);
|
||||
tear_down_client(session->slot);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user