RETSIGTYPE sig_term()
{
vmps_log(SYSTEM|INFO, "Terminating external program (%d).", external_pid);
if ( kill(external_pid, SIGTERM) < 0 ) {
vmps_log(SYSTEM|FATAL, "Cannot send TERM signal to external program (%s).", strerror(errno));
exit(1);
}
vmps_log(SYSTEM|INFO, "VMPSD TERMINATING.");
exit(0);
}
int get_vlan_external(VQP_REQUEST *r, char *vlan_name)
{
/*
external program input:
<domain> <switch ip> <port> <mac address>
external program output
ALLOW <vlan name>
DENY
SHUTDOWN
DOMAIN
return
0 - deny
1 - allow
2 - shutdown
3 - domain
*/
int n;
char str[256];
char buf[256];
char retcode[256];
char vname[256];
snprintf(str,255,"%s %s %s %s %02x%02x.%02x%02x.%02x%02x\n",
r->domain,
inet_ntoa(r->client_ip),
r->port,
r->vlan,
r->mac[0], r->mac[1], r->mac[2], r->mac[3], r->mac[4], r->mac[5]
);
//vmps_log(VQP|DEBUG, ">>>> Sending: %s ", str);
write(tocli[1], str, strlen(str));
//vmps_log(VQP|DEBUG, ">>>> Sent: %s ", str);
n = readline(fromcli[0], buf, 255);
//vmps_log(VQP|DEBUG,">>>> received %s", buf);
sscanf(buf,"%s %s",retcode, vname);
strncpy(vlan_name,vname,VLAN_NAME_MAX);
if ( strcmp(retcode,"ALLOW") ) { strcpy(vlan_name,""); }
//vmps_log(SYSTEM|DEBUG, "External prog says: %s %s", retcode, vlan_name);
vmps_log(VQP|DEBUG, "External prog says: %s %s", retcode, vlan_name);
if ( !strcmp(retcode,"ALLOW") ) { return 1; }
if ( !strcmp(retcode,"SHUTDOWN") ) { return 2; }
if ( !strcmp(retcode,"DOMAIN") ) { return 3; }
return 0;
}
RETSIGTYPE sig_child_e()
{
int pid;
int status;
pid = wait3(&status, WNOHANG, (struct rusage *) 0);
vmps_log(SYSTEM|INFO, "VMPSD EXITING (external program terminating prematurely)[%d].",pid);
exit(1);
}
void create_pidfile(int childpid) {
if (*pid_fname != 0) {
vmps_log(SYSTEM|FATAL, "Child PID: %d", childpid);
FILE *fh;
if ( (fh = fopen(pid_fname, "w")) >= 0 ) {
fprintf(fh, "%d", childpid);
}
}
}
int spawn_external()
{
pid_t chpid;
signal(SIGCHLD, sig_child_e);
if ( pipe(tocli) < 0 ) {
vmps_log(SYSTEM|FATAL, "Cannot create pipe (%s). Aborting.", strerror(errno));
exit(1);
}
if ( pipe(fromcli) < 0 ) {
vmps_log(SYSTEM|FATAL, "Cannot create pipe (%s). Aborting.", strerror(errno));
exit(1);
}
chpid = fork();
if ( chpid < 0 ) {
vmps_log(SYSTEM|FATAL, "Cannot fork (%s). Aborting.", strerror(errno));
exit(1);
}
if ( chpid == 0 ) {
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
if ( dup2(tocli[0],STDIN_FILENO) < 0 ) {
vmps_log(SYSTEM|FATAL, "Cannot dup2 STDIN (%s). Aborting.", strerror(errno));
exit(1);
}
if ( dup2(fromcli[1],STDOUT_FILENO) < 0 ) {
vmps_log(SYSTEM|FATAL, "Cannot dup2 STDOUT (%s). Aborting.", strerror(errno));
exit(1);
}
if ( execlp(external_prog,external_prog,NULL) < 0 ) {
vmps_log(SYSTEM|FATAL, "Failed to execve '%s' (%s). Aborting.", external_prog, strerror(errno));
exit(1);
}
/* not reached */
exit(1);
}
external_pid = chpid;
signal(SIGTERM, sig_term);
if ( !debug ) {
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
}
}