minix/commands/hostaddr/hostaddr.c

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2005-04-21 16:53:53 +02:00
/*
hostaddr.c
Fetch an ip and/or ethernet address and print it on one line.
Created: Jan 27, 1992 by Philip Homburg
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/utsname.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <net/netlib.h>
#include <net/hton.h>
#include <net/gen/ether.h>
#include <net/gen/eth_io.h>
#include <net/gen/if_ether.h>
#include <net/gen/in.h>
#include <net/gen/inet.h>
#include <net/gen/ip_io.h>
#include <net/gen/netdb.h>
#include <net/gen/socket.h>
#include <net/gen/nameser.h>
#include <net/gen/resolv.h>
#include <net/gen/dhcp.h>
#include <minix/paths.h>
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char *prog_name;
char DHCPCACHE[]=_PATH_DHCPCACHE;
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void main _ARGS(( int argc, char *argv[] ));
void usage _ARGS(( void ));
void main(argc, argv)
int argc;
char *argv[];
{
int c;
int first_print;
int a_flag, e_flag, i_flag, h_flag;
char *E_arg, *I_arg;
int do_ether, do_ip, do_asc_ip, do_hostname;
char *eth_device, *ip_device;
int eth_fd, ip_fd;
int result;
nwio_ethstat_t nwio_ethstat;
nwio_ipconf_t nwio_ipconf;
struct hostent *hostent;
char *hostname, *domain;
char nodename[2*256];
dhcp_t dhcp;
first_print= 1;
prog_name= argv[0];
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a_flag= e_flag= h_flag = i_flag= 0;
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E_arg= I_arg= NULL;
while((c= getopt(argc, argv, "?aheE:iI:")) != -1)
{
switch(c)
{
case '?':
usage();
case 'a':
if (a_flag)
usage();
a_flag= 1;
break;
case 'h':
if (h_flag)
usage();
h_flag= 1;
break;
case 'e':
if (e_flag)
usage();
e_flag= 1;
break;
case 'E':
if (E_arg)
usage();
E_arg= optarg;
break;
case 'i':
if (i_flag)
usage();
i_flag= 1;
break;
case 'I':
if (I_arg)
usage();
I_arg= optarg;
break;
default:
usage();
}
}
if(optind != argc)
usage();
do_ether= e_flag;
if (E_arg)
eth_device= E_arg;
else
{
eth_device= getenv("ETH_DEVICE");
if (!eth_device)
eth_device= ETH_DEVICE;
}
do_ip= i_flag;
do_asc_ip= a_flag;
do_hostname= h_flag;
if (I_arg)
ip_device= I_arg;
else
{
ip_device= getenv("IP_DEVICE");
if (!ip_device)
ip_device= IP_DEVICE;
}
if (!do_ether && !do_ip && !do_asc_ip && !do_hostname)
do_ether= do_ip= do_asc_ip= 1;
if (do_ether)
{
eth_fd= open(eth_device, O_RDWR);
if (eth_fd == -1)
{
fprintf(stderr, "%s: Unable to open '%s': %s\n",
prog_name, eth_device, strerror(errno));
exit(1);
}
result= ioctl(eth_fd, NWIOGETHSTAT, &nwio_ethstat);
if (result == -1)
{
fprintf(stderr,
"%s: Unable to fetch ethernet address: %s\n",
prog_name, strerror(errno));
exit(1);
}
printf("%s%s", first_print ? "" : " ",
ether_ntoa(&nwio_ethstat.nwes_addr));
first_print= 0;
}
if (do_ip || do_asc_ip || do_hostname)
{
ip_fd= open(ip_device, O_RDWR);
if (ip_fd == -1)
{
fprintf(stderr, "%s: Unable to open '%s': %s\n",
prog_name, ip_device, strerror(errno));
exit(1);
}
result= ioctl(ip_fd, NWIOGIPCONF, &nwio_ipconf);
if (result == -1)
{
fprintf(stderr,
"%s: Unable to fetch IP address: %s\n",
prog_name,
strerror(errno));
exit(1);
}
}
setuid(getuid());
if (do_ip)
{
printf("%s%s", first_print ? "" : " ",
inet_ntoa(nwio_ipconf.nwic_ipaddr));
first_print= 0;
}
if (do_asc_ip || do_hostname)
{
int fd;
int r;
dhcp_t d;
u8_t *data;
size_t hlen, dlen;
hostname= NULL;
domain= NULL;
/* Use a reverse DNS lookup to get the host name. This is
* the preferred method, but often fails due to lazy admins.
*/
hostent= gethostbyaddr((char *)&nwio_ipconf.nwic_ipaddr,
sizeof(nwio_ipconf.nwic_ipaddr), AF_INET);
if (hostent != NULL) hostname= hostent->h_name;
if (hostname != NULL)
{
/* Reverse DNS works. */
}
else if ((fd= open(DHCPCACHE, O_RDONLY)) == -1)
{
if (errno != ENOENT)
{
fprintf(stderr, "%s: %s: %s\n",
prog_name, DHCPCACHE, strerror(errno));
exit(1);
}
}
else
{
/* Try to get the hostname from the DHCP data. */
while ((r= read(fd, &d, sizeof(d))) == sizeof(d))
{
if (d.yiaddr == nwio_ipconf.nwic_ipaddr) break;
}
if (r < 0)
{
fprintf(stderr, "%s: %s: %s\n",
prog_name, DHCPCACHE, strerror(errno));
exit(1);
}
close(fd);
if (r == sizeof(d))
{
if (dhcp_gettag(&d, DHCP_TAG_HOSTNAME,
&data, &hlen))
hostname= (char *) data;
if (dhcp_gettag(&d, DHCP_TAG_DOMAIN,
&data, &dlen))
domain= (char *) data;
if (hostname != NULL) hostname[hlen] = 0;
if (domain != NULL) domain[dlen] = 0;
}
}
if (hostname != NULL)
{
if (strchr(hostname, '.') != NULL)
{
domain= strchr(hostname, '.');
*domain++ = 0;
}
}
else
{
/* No host name anywhere. Use the IP address. */
hostname= inet_ntoa(nwio_ipconf.nwic_ipaddr);
domain= NULL;
}
strcpy(nodename, hostname);
if (domain != NULL)
{
strcat(nodename, ".");
strcat(nodename, domain);
}
}
if (do_asc_ip)
{
printf("%s%s", first_print ? "" : " ", nodename);
first_print= 0;
}
if (do_hostname)
{
#if __minix_vmd
if (sysuname(_UTS_SET, _UTS_NODENAME,
nodename, strlen(nodename)+1) == -1)
{
fprintf(stderr, "%s: Unable to set nodename: %s\n",
prog_name, strerror(errno));
exit(1);
}
if (sysuname(_UTS_SET, _UTS_HOSTNAME,
hostname, strlen(hostname)+1) == -1)
{
fprintf(stderr, "%s: Unable to set hostname: %s\n",
prog_name, strerror(errno));
exit(1);
}
#else
FILE *fp;
if ((fp= fopen("/etc/hostname.file", "w")) == NULL
|| fprintf(fp, "%s\n", nodename) == EOF
|| fclose(fp) == EOF)
{
fprintf(stderr, "%s: /etc/hostname.file: %s\n",
prog_name, strerror(errno));
exit(1);
}
#endif
}
if (!first_print) printf("\n");
exit(0);
}
void usage()
{
fprintf(stderr,
"Usage: %s -[eiah] [-E <eth-device>] [-I <ip-device>]\n",
prog_name);
exit(1);
}