struct net_data *
net_data_create(const char *conf_file) {
struct net_data *net_data;
net_data = memget(sizeof (struct net_data));
if (net_data == NULL)
return (NULL);
memset(net_data, 0, sizeof (struct net_data));
if ((net_data->irs = irs_gen_acc("", conf_file)) == NULL) {
memput(net_data, sizeof (struct net_data));
return (NULL);
}
#ifndef DO_PTHREADS
(*net_data->irs->res_set)(net_data->irs, &_res, NULL);
#endif
net_data->res = (*net_data->irs->res_get)(net_data->irs);
if (net_data->res == NULL) {
(*net_data->irs->close)(net_data->irs);
memput(net_data, sizeof (struct net_data));
return (NULL);
}
if ((net_data->res->options & RES_INIT) == 0U &&
res_ninit(net_data->res) == -1) {
(*net_data->irs->close)(net_data->irs);
memput(net_data, sizeof (struct net_data));
return (NULL);
}
return (net_data);
}
static struct addrlist *
getwire_lookup(u_long address, u_long netmask, int ishost)
{
struct addrlist *al;
u_long subnet;
char netNumberBuf[64];
char buf[GFBUFLEN], *s;
#ifdef HAVE_IRS_H
struct nwent *np;
#else /* not HAVE_IRS_H */
struct netent *np;
#endif /* not HAVE_IRS_H */
/*
* Add interface to local network singly linked list
*/
al = ALLOC(struct addrlist);
al->ip_addr = address;
al->ip_mask = netmask;
al->ip_net_name = NO_SUBNET; /* fill in a bit later */
al->ip_net_num = "0.0.0.0"; /* fill in a bit later */
al->ip_next = NULL;
subnet = ntohl(address) & ntohl(netmask);
if (ishost)
np = NULL;
else {
#ifdef HAVE_IRS_H
u_long mask = ntohl(netmask);
static struct irs_acc *irs_gen;
static struct irs_nw *irs_nw;
u_long net;
int maskbits;
u_char addr[4];
if (irs_gen == NULL)
#ifdef irs_irp_acc
/*
* bsdi4 added another argument to this function, without changing
* its name. The irs_irp_acc is the one (hacky) distinguishing
* feature found in <irs.h> that can differentiate between bsdi3 and
* bsdi4.
*/
irs_gen = irs_gen_acc("", NULL);
#else /* not irs_irp_acc */
irs_gen = irs_gen_acc("");
#endif /* not irs_irp_acc */
if (irs_gen && irs_nw == NULL)
irs_nw = (*irs_gen->nw_map)(irs_gen);
net = ntohl(address) & (mask = ntohl(netmask));
addr[0] = (0xFF000000 & net) >> 24;
addr[1] = (0x00FF0000 & net) >> 16;
addr[2] = (0x0000FF00 & net) >> 8;
addr[3] = (0x000000FF & net);
for (maskbits = 32; !(mask & 1); mask >>= 1)
maskbits--;
np = (*irs_nw->byaddr)(irs_nw, addr, maskbits, AF_INET);
#else /* not HAVE_IRS_H */
np = getnetbyaddr(subnet, AF_INET);
/*
* Some systems (IRIX 6.4) cannot getnetbyaddr on networks such as
* "128.59.16.0". Instead, they need to look for the short form of
* the network, "128.59.16". So if the first getnetbyaddr failed, we
* shift the subnet way from zeros and try again.
*/
if (!np) {
u_long short_subnet = subnet;
while (short_subnet && (short_subnet & 0x000000ff) == 0)
short_subnet >>= 8;
np = getnetbyaddr(short_subnet, AF_INET);
if (np)
plog(XLOG_WARNING, "getnetbyaddr failed on 0x%x, succeeded on 0x%x",
(u_int) subnet, (u_int) short_subnet);
}
#endif /* not HAVE_IRS_H */
}
