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#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <string.h>
#include "dom0_defs.h"
#include "mem_defs.h"
#define SILENT_ERRORS_FROM_XEN
#define SYSLOG 1
#define SYSLOGTO LOG_LOCAL5
int logoutput;
void stripit(char *str)
{
int i;
for ( i = 0; str[i]; i++ )
if ( (str[i] == '\n') || (str[i] == '\r') )
str[i] = '\0';
}
void errexit(char *str)
{
if ( logoutput == SYSLOG )
{
stripit(str);
syslog(LOG_ERR, "%s failed: %d (%m)", str, errno);
}
else
{
printf("%s", str);
}
exit(1);
}
void log(char *str)
{
if ( logoutput == SYSLOG )
{
stripit(str);
syslog(LOG_INFO, "%s", str);
}
else
{
printf("%s", str);
}
}
void process(void)
{
dom0_op_t op;
unsigned char buf[208], obuf[224];
struct sockaddr_in addr, from;
int fromlen = sizeof(from);
int len, fd = socket(PF_INET, SOCK_DGRAM, 0);
unsigned short int lastport = 0, curport = 0;
if ( fd < 0 )
errexit("could not open datagram socket");
memset(&addr, 0, sizeof(addr));
addr.sin_addr.s_addr = htonl(0xa9fe0100); /* 169.254.1.0 */
addr.sin_port = htons(666);
addr.sin_family = AF_INET;
if ( bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0 )
errexit("could not bind to local address and port");
op.cmd = DOM0_GETDOMAININFO;
while ( (len = recvfrom(fd, buf, sizeof(buf), 0,
(struct sockaddr *)&from, &fromlen)) >= 0 )
{
curport = ntohs(from.sin_port);
if ( lastport != curport )
{
op.u.getdomaininfo.domain = (int)curport;
if ( do_dom0_op(&op) < 0 )
log("Error resolving domain name\n");
else
lastport = curport;
}
sprintf(obuf, "[%s] %s", op.u.getdomaininfo.name, buf);
log(obuf);
fromlen = sizeof(from);
}
}
void closeall(int fd)
{
int fdlimit = sysconf(_SC_OPEN_MAX);
while (fd < fdlimit)
close(fd++);
}
int daemon(int nochdir, int noclose)
{
switch (fork())
{
case 0: break;
case -1: return -1;
default: _exit(0);
}
if (setsid() < 0)
return -1;
switch (fork())
{
case 0: break;
case -1: return -1;
default: _exit(0);
}
if (!nochdir)
chdir("/");
if (!noclose)
{
closeall(0);
open("/dev/null",O_RDWR);
dup(0); dup(0);
}
return 0;
}
int main(int argc, char **argv)
{
int c;
logoutput = 0;
opterr = 0;
while ( (c = getopt (argc, argv, "dh")) != -1 )
{
switch(c)
{
case 'd':
logoutput = SYSLOG;
if (daemon(0,0) < 0)
{
errno = 2;
errexit("daemon");
} else {
openlog("xen_log", LOG_PID, SYSLOGTO);
}
break;
case 'h':
printf("Usage: xen_log [options]\n");
printf("Capture and display output of xen domains.\n\n");
printf(" -d Daemonize and send output to syslog.\n");
exit(0);
break;
}
}
process();
return 0;
}
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