/*! \brief generic handle io routine, it will call the appropiate
* handle_xxx() based on the fd_map type
*
* \param fm - pointer to a fd hash entry
* \param idx - index in the fd_array (or -1 if not known)
* \return -1 on error
* 0 on EAGAIN or when by some other way it is known that no more
* io events are queued on the fd (the receive buffer is empty).
* Usefull to detect when there are no more io events queued for
* sigio_rt, epoll_et, kqueue.
* >0 on successfull read from the fd (when there might be more io
* queued -- the receive buffer might still be non-empty)
*/
inline static int handle_io(struct fd_map* fm, int idx)
{
int ret;
switch(fm->type){
case F_SOCKINFO:
ret=handle_new_connect((struct socket_info*)fm->data);
break;
case F_TCPCONN:
ret=handle_tcpconn_ev((struct tcp_connection*)fm->data, idx);
break;
case F_TCPCHILD:
ret=handle_tcp_child((struct tcp_child*)fm->data, idx);
break;
case F_PROC:
ret=handle_ser_child((struct process_table*)fm->data, idx);
break;
case F_NONE:
LM_CRIT("empty fd map\n");
goto error;
default:
LM_CRIT("uknown fd type %d\n", fm->type);
goto error;
}
return ret;
error:
return -1;
}
/*! \brief generic handle io routine, it will call the appropiate
* handle_xxx() based on the fd_map type
*
* \param fm - pointer to a fd hash entry
* \param idx - index in the fd_array (or -1 if not known)
* \return -1 on error
* 0 on EAGAIN or when by some other way it is known that no more
* io events are queued on the fd (the receive buffer is empty).
* Usefull to detect when there are no more io events queued for
* sigio_rt, epoll_et, kqueue.
* >0 on successfull read from the fd (when there might be more io
* queued -- the receive buffer might still be non-empty)
*/
inline static int handle_io(struct fd_map* fm, int idx,int event_type)
{
int ret;
switch(fm->type){
case F_TCP_LISTENER:
ret = handle_new_connect((struct socket_info*)fm->data);
break;
case F_TCPCONN:
ret = handle_tcpconn_ev((struct tcp_connection*)fm->data, idx,
event_type);
break;
case F_TCP_TCPWORKER:
ret = handle_tcp_worker((struct tcp_child*)fm->data, idx);
break;
case F_TCP_WORKER:
ret = handle_worker((struct process_table*)fm->data, idx);
break;
case F_NONE:
LM_CRIT("empty fd map\n");
goto error;
default:
LM_CRIT("unknown fd type %d\n", fm->type);
goto error;
}
return ret;
error:
return -1;
}
void tcp_main_loop()
{
int r;
int n;
fd_set master_set;
fd_set sel_set;
int maxfd;
struct tcp_connection* tcpconn;
unsigned h;
long response[2];
int cmd;
int bytes;
struct timeval timeout;
int fd;
/*init */
maxfd=0;
FD_ZERO(&master_set);
/* set all the listen addresses */
for (r=0; r<sock_no; r++){
if ((tcp_info[r].proto==PROTO_TCP) &&(tcp_info[r].socket!=-1)){
FD_SET(tcp_info[r].socket, &master_set);
if (tcp_info[r].socket>maxfd) maxfd=tcp_info[r].socket;
}
#ifdef USE_TLS
if ((!tls_disable)&&(tls_info[r].proto==PROTO_TLS) &&
(tls_info[r].socket!=-1)){
FD_SET(tls_info[r].socket, &master_set);
if (tls_info[r].socket>maxfd) maxfd=tls_info[r].socket;
}
#endif
}
/* set all the unix sockets used for child comm */
for (r=1; r<process_no; r++){
if (pt[r].unix_sock>0){ /* we can't have 0, we never close it!*/
FD_SET(pt[r].unix_sock, &master_set);
if (pt[r].unix_sock>maxfd) maxfd=pt[r].unix_sock;
}
}
for (r=0; r<tcp_children_no; r++){
if (tcp_children[r].unix_sock>0){ /* we can't have 0,
we never close it!*/
FD_SET(tcp_children[r].unix_sock, &master_set);
if (tcp_children[r].unix_sock>maxfd)
maxfd=tcp_children[r].unix_sock;
}
}
/* main loop*/
while(1){
sel_set=master_set;
timeout.tv_sec=TCP_MAIN_SELECT_TIMEOUT;
timeout.tv_usec=0;
n=select(maxfd+1, &sel_set, 0 ,0 , &timeout);
if (n<0){
if (errno==EINTR) continue; /* just a signal */
/* errors */
LOG(L_ERR, "ERROR: tcp_main_loop: select:(%d) %s\n", errno,
strerror(errno));
n=0;
}
for (r=0; r<sock_no && n; r++){
handle_new_connect(&tcp_info[r], &sel_set, &n);
#ifdef USE_TLS
if (!tls_disable)
handle_new_connect(&tls_info[r], &sel_set, &n);
#endif
}
/* check all the read fds (from the tcpconn_addr_hash ) */
for (h=0; h<TCP_ADDR_HASH_SIZE; h++){
for(tcpconn=tcpconn_addr_hash[h]; tcpconn && n;
tcpconn=tcpconn->next){
/* FIXME: is refcnt==0 really necessary? */
if ((tcpconn->refcnt==0)&&(FD_ISSET(tcpconn->s, &sel_set))){
/* new data available */
n--;
/* pass it to child, so remove it from select list */
DBG("tcp_main_loop: data available on %p [h:%d] %d\n",
tcpconn, h, tcpconn->s);
FD_CLR(tcpconn->s, &master_set);
tcpconn_ref(tcpconn); /* refcnt ++ */
if (send2child(tcpconn)<0){
LOG(L_ERR,"ERROR: tcp_main_loop: no "
"children available\n");
TCPCONN_LOCK;
tcpconn->refcnt--;
if (tcpconn->refcnt==0){
fd=tcpconn->s;
_tcpconn_rm(tcpconn);
close(fd);
}else tcpconn->timeout=0; /* force expire*/
TCPCONN_UNLOCK;
}
}
}
}
/* check unix sockets & listen | destroy connections */
/* tcp_children readers first */
for (r=0; r<tcp_children_no && n; r++){
if ( (tcp_children[r].unix_sock>0) &&
FD_ISSET(tcp_children[r].unix_sock, &sel_set)){
/* (we can't have a fd==0, 0 is never closed )*/
n--;
/* read until sizeof(response)
* (this is a SOCK_STREAM so read is not atomic */
bytes=recv_all(tcp_children[r].unix_sock, response,
sizeof(response));
if (bytes==0){
/* EOF -> bad, child has died */
DBG("DBG: tcp_main_loop: dead tcp child %d"
" (shutting down?)\n", r);
/* don't listen on it any more */
FD_CLR(tcp_children[r].unix_sock, &master_set);
/*exit(-1);*/
continue; /* skip this and try the next one */
}else if (bytes<0){
LOG(L_CRIT, "ERROR: tcp_main_loop: read from tcp child %d "
"%s\n", r, strerror(errno));
/* try to ignore ? */
continue; /* skip this and try the next one */
}
DBG("tcp_main_loop: reader response= %lx, %ld from %d \n",
response[0], response[1], r);
cmd=response[1];
tcpconn=(struct tcp_connection*)response[0];
switch(cmd){
case CONN_RELEASE:
tcp_children[r].busy--;
if (tcpconn){
if (tcpconn->state==S_CONN_BAD){
tcpconn_destroy(tcpconn);
break;
}
FD_SET(tcpconn->s, &master_set);
if (maxfd<tcpconn->s) maxfd=tcpconn->s;
/* update the timeout*/
tcpconn->timeout=get_ticks()+TCP_CON_TIMEOUT;
tcpconn_put(tcpconn);
DBG("tcp_main_loop: CONN_RELEASE %p"
" refcnt= %d\n",
tcpconn, tcpconn->refcnt);
}
break;
case CONN_ERROR:
case CONN_DESTROY:
case CONN_EOF:
/* WARNING: this will auto-dec. refcnt! */
tcp_children[pt[r].idx].busy--;
if (tcpconn){
if (tcpconn->s!=-1)
FD_CLR(tcpconn->s, &master_set);
tcpconn_destroy(tcpconn);
}
break;
default:
LOG(L_CRIT, "BUG: tcp_main_loop: unknown cmd %d"
" from tcp reader %d\n",
cmd, r);
}
}
}
/* check "send" unix sockets & listen | destroy connections */
/* start from 1, the "main" process does not transmit anything*/
for (r=1; r<process_no && n; r++){
if ( (pt[r].unix_sock>0) && FD_ISSET(pt[r].unix_sock, &sel_set)){
/* (we can't have a fd==0, 0 is never closed )*/
n--;
/* read until sizeof(response)
* (this is a SOCK_STREAM so read is not atomic */
bytes=recv_all(pt[r].unix_sock, response, sizeof(response));
if (bytes==0){
/* EOF -> bad, child has died */
DBG("DBG: tcp_main_loop: dead child %d"
" (shutting down?)\n", r);
/* don't listen on it any more */
FD_CLR(pt[r].unix_sock, &master_set);
/*exit(-1);*/
continue; /* skip this and try the next one */
}else if (bytes<0){
LOG(L_CRIT, "ERROR: tcp_main_loop: read from child: %s\n",
strerror(errno));
/* try to ignore ? */
continue; /* skip this and try the next one */
}
DBG("tcp_main_loop: read response= %lx, %ld from %d (%d)\n",
response[0], response[1], r, pt[r].pid);
cmd=response[1];
tcpconn=(struct tcp_connection*)response[0];
switch(cmd){
case CONN_ERROR:
if (tcpconn){
if (tcpconn->s!=-1)
FD_CLR(tcpconn->s, &master_set);
tcpconn_destroy(tcpconn);
}
break;
case CONN_GET_FD:
/* send the requested FD */
/* WARNING: take care of setting refcnt properly to
* avoid race condition */
if (tcpconn){
if (send_fd(pt[r].unix_sock, &tcpconn,
sizeof(tcpconn), tcpconn->s)<=0){
LOG(L_ERR, "ERROR: tcp_main_loop:"
"send_fd failed\n");
}
}else{
LOG(L_CRIT, "BUG: tcp_main_loop: null pointer\n");
}
break;
case CONN_NEW:
/* update the fd in the requested tcpconn*/
/* WARNING: take care of setting refcnt properly to
* avoid race condition */
if (tcpconn){
bytes=receive_fd(pt[r].unix_sock, &tcpconn,
sizeof(tcpconn), &tcpconn->s);
if (bytes<sizeof(tcpconn)){
if (bytes<0){
LOG(L_CRIT, "BUG: tcp_main_loop:"
" CONN_NEW: receive_fd "
"failed\n");
}else{
LOG(L_CRIT, "BUG: tcp_main_loop:"
" CONN_NEW: to few bytes "
"received (%d)\n", bytes );
}
break; /* try to ignore */
}
/* add tcpconn to the list*/
tcpconn_add(tcpconn);
FD_SET(tcpconn->s, &master_set);
if (maxfd<tcpconn->s) maxfd=tcpconn->s;
/* update the timeout*/
tcpconn->timeout=get_ticks()+TCP_CON_TIMEOUT;
}else{
LOG(L_CRIT, "BUG: tcp_main_loop: null pointer\n");
}
break;
default:
LOG(L_CRIT, "BUG: tcp_main_loop: unknown cmd %d\n",
cmd);
}
}
} /* for */
/* remove old connections */
tcpconn_timeout(&master_set);
}
}
