static int
ethers(int argc, char *argv[])
{
char hostname[MAXHOSTNAMELEN], *hp;
int i, rv = RV_OK;
struct ether_addr ea, *eap;
if (argc == 2) {
fprintf(stderr, "%s: Enumeration not supported on ethers\n",
__progname);
rv = RV_NOENUM;
} else {
for (i = 2; i < argc; i++) {
if ((eap = ether_aton(argv[i])) == NULL) {
eap = &ea;
hp = argv[i];
if (ether_hostton(hp, eap) != 0) {
rv = RV_NOTFOUND;
break;
}
} else {
hp = hostname;
if (ether_ntohost(hp, eap) != 0) {
rv = RV_NOTFOUND;
break;
}
}
ETHERSPRINT;
}
}
return rv;
}
static void
_addressToString(const u_int8_t *address, char *buffer)
{
if (ether_ntohost(buffer, (struct ether_addr *) address) == -1) {
sprintf(buffer, "%2.2hhx:%2.2hhx:%2.2hhx:%2.2hhx:%2.2hhx:%2.2hhx",
address[0], address[1], address[2],
address[3], address[4], address[5]);
}
}
void testValues() {
f = 2;
char buf[255];
struct ether_addr addr;
ether_ntohost(buf, &addr);
//@ assert f == 2;
//@ assert vacuous: \false;
}
struct rarp_map *rarp_lookup(int ifindex, int hatype,
int halen, unsigned char *lladdr)
{
struct rarp_map *r;
for (r=rarp_db; r; r=r->next) {
if (r->arp_type != hatype && r->arp_type != -1)
continue;
if (r->lladdr_len != halen)
continue;
if (r->ifindex != ifindex && r->ifindex != 0)
continue;
if (memcmp(r->lladdr, lladdr, halen) == 0)
break;
}
if (r == NULL) {
if (hatype == ARPHRD_ETHER && halen == 6) {
struct ifaddr *ifa;
struct hostent *hp;
char ename[256];
static struct rarp_map emap = {
NULL,
0,
ARPHRD_ETHER,
6,
};
if (ether_ntohost(ename, lladdr) != 0 ||
(hp = gethostbyname(ename)) == NULL) {
if (verbose)
syslog(LOG_INFO, "not found in /etc/ethers");
return NULL;
}
if (hp->h_addrtype != AF_INET) {
syslog(LOG_ERR, "no IP address");
return NULL;
}
ifa = select_ipaddr(ifindex, &emap.ipaddr, (__u32 **)hp->h_addr_list);
if (ifa) {
memcpy(emap.lladdr, lladdr, 6);
if (only_ethers || bootable(emap.ipaddr))
return &emap;
if (verbose)
syslog(LOG_INFO, "not bootable");
}
}
}
return r;
}
/*
* Answer the RARP request in 'pkt', on the interface 'ii'. 'pkt' has
* already been checked for validity. The reply is overlaid on the request.
*/
void
rarp_process(struct if_info *ii, u_char *pkt)
{
char ename[HOST_NAME_MAX+1];
u_int32_t target_ipaddr;
struct ether_header *ep;
struct ether_addr *ea;
struct hostent *hp;
struct in_addr in;
struct if_addr *ia;
ep = (struct ether_header *) pkt;
ea = (struct ether_addr *) &ep->ether_shost;
debug("%s", ether_ntoa(ea));
if (ether_ntohost(ename, ea) != 0) {
debug("ether_ntohost failed");
return;
}
if ((hp = gethostbyname(ename)) == 0) {
debug("gethostbyname (%s) failed", ename);
return;
}
/* Choose correct address from list. */
if (hp->h_addrtype != AF_INET) {
error(FATAL, "cannot handle non IP addresses");
/* NOTREACHED */
}
for (target_ipaddr = 0, ia = ii->ii_addrs; ia; ia = ia->ia_next) {
target_ipaddr = choose_ipaddr((u_int32_t **) hp->h_addr_list,
ia->ia_ipaddr & ia->ia_netmask, ia->ia_netmask);
if (target_ipaddr)
break;
}
if (target_ipaddr == 0) {
for (ia = ii->ii_addrs; ia; ia = ia->ia_next) {
in.s_addr = ia->ia_ipaddr & ia->ia_netmask;
error(NONFATAL, "cannot find %s on net %s",
ename, inet_ntoa(in));
}
return;
}
if (tflag == 0 || rarp_bootable(htonl(target_ipaddr)))
rarp_reply(ii, ia, ep, target_ipaddr, hp);
debug("reply sent");
}
/*
* ethers
*/
static int
ethers(int argc, char *argv[])
{
char hostname[MAXHOSTNAMELEN + 1], *hp;
struct ether_addr ea, *eap;
int i, rv;
assert(argc > 1);
assert(argv != NULL);
#define ETHERSPRINT printf("%-17s %s\n", ether_ntoa(eap), hp)
rv = RV_OK;
if (argc == 2) {
fprintf(stderr, "Enumeration not supported on ethers\n");
rv = RV_NOENUM;
} else {
for (i = 2; i < argc; i++) {
if ((eap = ether_aton(argv[i])) == NULL) {
eap = &ea;
hp = argv[i];
if (ether_hostton(hp, eap) != 0) {
rv = RV_NOTFOUND;
break;
}
} else {
hp = hostname;
if (ether_ntohost(hp, eap) != 0) {
rv = RV_NOTFOUND;
break;
}
}
ETHERSPRINT;
}
}
return rv;
}
/*
This may (and will) block.
Use local /etc/ethers and /etc/hosts
to avoid NIS and DNS queries.
*/
int resolve(struct ether_addr *addr, struct in_addr *in_addr)
{
char hostname[4096];
memset(hostname, 0, sizeof(hostname));
/*
This is not really safe, at the time of writing glibc uses
a 1024 byte buffer for the answer internally ... We could
parse /etc/ethers by ourselves but then we would loose
nsswitch support. Alas RARP support without NIS is no fun :-(
*/
int ret = ether_ntohost(hostname, addr);
if (ret != 0) {
XLOG_DEBUG("failed to lookup %s", ether_ntoa(addr));
return -1;
}
XLOG_DEBUG("lookup for %s returned %s", ether_ntoa(addr), hostname);
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_flags = AI_ADDRCONFIG;
struct addrinfo *ai = NULL;
ret = getaddrinfo(hostname, NULL, &hints, &ai);
if (ret != 0) {
XLOG_DEBUG("could not resolve '%s': %s\n", hostname,
ret == EAI_SYSTEM ? strerror(errno) : gai_strerror(ret));
return -1;
}
struct sockaddr_in *sa = (struct sockaddr_in *)(ai->ai_addr);
memcpy(in_addr, &(sa->sin_addr), sizeof(struct in_addr));
return 0;
}
int main(int argc, char **argv)
{
int i;
ethernet_t *ep;
nwio_ethopt_t ethopt;
nwio_ethstat_t ethstat;
char hostname[1024];
struct hostent *hostent;
struct sigaction sa;
nwio_ipconf_t ipconf;
asynchio_t asyn;
ssize_t n;
ipaddr_t ip_addr;
rarp46_t rarp46;
int fd;
int n_eths;
program= argv[0];
asyn_init(&asyn);
debug= 0;
i= 1;
while (i < argc && argv[i][0] == '-') {
char *opt= argv[i++]+1;
if (opt[0] == '-' && opt[1] == 0) break; /* -- */
while (*opt != 0) switch (*opt++) {
case 'd':
debug= 1;
if (between('0', *opt, '9')) debug= strtoul(opt, &opt, 10);
break;
default:
usage();
}
}
if ((n_eths= (argc - i)) == 0) usage();
#if __minix_vmd
/* Minix-vmd can handle all nets at once using async I/O. */
ethernets= allocate(n_eths * sizeof(ethernets[0]));
for (i= 0; i < n_eths; i++) {
ethernets[i].n= ifname2n(argv[argc - n_eths + i]);
}
#else
/* Minix forks n-1 times to handle each net in a process each. */
for (i= 0; i < n_eths; i++) {
if (i+1 < n_eths) {
switch (fork()) {
case -1: fatal("fork()");
case 0: break;
default: continue;
}
}
ethernets= allocate(1 * sizeof(ethernets[0]));
ethernets[0].n= ifname2n(argv[argc - n_eths + i]);
}
n_eths= 1;
#endif
sa.sa_handler= onsig;
sigemptyset(&sa.sa_mask);
sa.sa_flags= 0;
sigaction(SIGUSR1, &sa, NULL);
sigaction(SIGUSR2, &sa, NULL);
for (i= 0; i < n_eths; i++) {
ep= ðernets[i];
if ((ep->eth_fd= open(ethdev(ep->n), O_RDWR)) < 0) fatal(ethdev(ep->n));
if (ioctl(ep->eth_fd, NWIOGETHSTAT, ðstat) < 0) {
fprintf(stderr, "%s: %s: Unable to get eth statistics: %s\n",
program, ethdev(ep->n), strerror(errno));
exit(1);
}
ep->eth_addr= ethstat.nwes_addr;
if (debug >= 1) {
printf("%s: Ethernet address is %s\n",
ethdev(ep->n), ether_ntoa(&ep->eth_addr));
}
ethopt.nweo_flags= NWEO_COPY | NWEO_EN_LOC | NWEO_EN_BROAD |
NWEO_TYPESPEC;
ethopt.nweo_type= HTONS(ETH_RARP_PROTO);
if (ioctl(ep->eth_fd, NWIOSETHOPT, ðopt) < 0) {
fprintf(stderr, "%s: %s: Unable to set eth options: %s\n",
program, ethdev(ep->n), strerror(errno));
exit(1);
}
/* What are my address and netmask? */
if ((fd= open(ipdev(ep->n), O_RDWR)) < 0) fatal(ipdev(ep->n));
if (ioctl(fd, NWIOGIPCONF, &ipconf) < 0) fatal(ipdev(ep->n));
ep->ip_addr= ipconf.nwic_ipaddr;
ep->ip_mask= ipconf.nwic_netmask;
close(fd);
if (debug >= 1) {
printf("%s: IP address is %s / ",
ipdev(ep->n), inet_ntoa(ep->ip_addr));
printf("%s\n", inet_ntoa(ep->ip_mask));
}
}
/* Wait for RARP requests, reply, repeat. */
for(;;) {
fflush(NULL);
/* Wait for a RARP request. */
for (i= 0; i < n_eths; i++) {
ep= ðernets[i];
n= asyn_read(&asyn, ep->eth_fd, ep->packet, sizeof(ep->packet));
if (n != -1) break;
if (errno != EINPROGRESS) {
report(ethdev(ep->n));
sleep(10);
}
}
/* RARP request? */
if (i < n_eths
&& n >= sizeof(rarp46)
&& (memcpy(&rarp46, ep->packet, sizeof(rarp46)), 1)
&& rarp46.a46_hdr == HTONS(RARP_ETHERNET)
&& rarp46.a46_pro == HTONS(ETH_IP_PROTO)
&& rarp46.a46_hln == 6
&& rarp46.a46_pln == 4
&& rarp46.a46_op == HTONS(RARP_REQUEST)
) {
if ((ether_ntohost(hostname, &rarp46.a46_tha) == 0
|| (rarp46.a46_tha.ea_addr[0] == 'v'
&& (memcpy(&ip_addr, rarp46.a46_tha.ea_addr+2, 4), 1)
&& (hostent= gethostbyaddr((char*) &ip_addr,
4, AF_INET)) != NULL
&& addhostname(hostname, hostent->h_name,
rarp46.a46_tha.ea_addr[1])))
&& (hostent= gethostbyname(hostname)) != NULL
&& hostent->h_addrtype == AF_INET
) {
/* Host is found in the ethers file and the DNS, or the
* ethernet address denotes a special additional address
* used for implementing a TCP/IP stack in user space.
*/
for (i= 0; hostent->h_addr_list[i] != NULL; i++) {
memcpy(&ip_addr, hostent->h_addr_list[i], sizeof(ipaddr_t));
/* Check if the address is on this network. */
if (((ip_addr ^ ep->ip_addr) & ep->ip_mask) == 0) break;
}
if (hostent->h_addr_list[i] != NULL) {
rarp_reply(ep, hostname, ip_addr, rarp46.a46_tha);
} else {
if (debug >= 2) {
printf("%s: Host '%s' (%s) is on the wrong net\n",
ethdev(ep->n),
hostname, ether_ntoa(&rarp46.a46_tha));
}
}
} else {
if (debug >= 2) {
printf("%s: RARP request from unknown host '%s'\n",
ethdev(ep->n), ether_ntoa(&rarp46.a46_tha));
}
}
}
/* Wait for another request. */
if (asyn_wait(&asyn, 0, NULL) < 0) {
report("asyn_wait()");
sleep(10);
}
}
}
void runFailure() {
char buf[255];
struct ether_addr addr;
ether_ntohost(NULL, &addr);
}
void runSuccess() {
char buf[255];
struct ether_addr addr;
ether_ntohost(buf, &addr);
}
void runFailure2() {
char buf[254];
struct ether_addr addr;
ether_ntohost(buf, &addr);
}
void runFailure1() {
char buf[255];
struct ether_addr addr;
ether_ntohost(buf, NULL);
}
