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/* vi: set sw=4 ts=4: */
/*
* utils.c
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
* Changes:
*
* Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
*/
#include "libbb.h"
#include "utils.h"
#include "inet_common.h"
unsigned get_unsigned(char *arg, const char *errmsg)
{
unsigned long res;
char *ptr;
if (*arg) {
res = strtoul(arg, &ptr, 0);
if (!*ptr && res <= UINT_MAX) {
return res;
}
}
invarg(arg, errmsg); /* does not return */
}
uint32_t get_u32(char *arg, const char *errmsg)
{
unsigned long res;
char *ptr;
if (*arg) {
res = strtoul(arg, &ptr, 0);
if (!*ptr && res <= 0xFFFFFFFFUL) {
return res;
}
}
invarg(arg, errmsg); /* does not return */
}
uint16_t get_u16(char *arg, const char *errmsg)
{
unsigned long res;
char *ptr;
if (*arg) {
res = strtoul(arg, &ptr, 0);
if (!*ptr && res <= 0xFFFF) {
return res;
}
}
invarg(arg, errmsg); /* does not return */
}
int get_addr_1(inet_prefix *addr, char *name, int family)
{
memset(addr, 0, sizeof(*addr));
if (strcmp(name, bb_str_default) == 0
|| strcmp(name, "all") == 0
|| strcmp(name, "any") == 0
) {
addr->family = family;
addr->bytelen = (family == AF_INET6 ? 16 : 4);
addr->bitlen = -1;
return 0;
}
if (strchr(name, ':')) {
addr->family = AF_INET6;
if (family != AF_UNSPEC && family != AF_INET6)
return -1;
if (inet_pton(AF_INET6, name, addr->data) <= 0)
return -1;
addr->bytelen = 16;
addr->bitlen = -1;
return 0;
}
addr->family = AF_INET;
if (family != AF_UNSPEC && family != AF_INET)
return -1;
if (inet_pton(AF_INET, name, addr->data) <= 0)
return -1;
addr->bytelen = 4;
addr->bitlen = -1;
return 0;
}
static int get_prefix_1(inet_prefix *dst, char *arg, int family)
{
int err;
unsigned plen;
char *slash;
memset(dst, 0, sizeof(*dst));
if (strcmp(arg, bb_str_default) == 0
|| strcmp(arg, "all") == 0
|| strcmp(arg, "any") == 0
) {
dst->family = family;
/*dst->bytelen = 0; - done by memset */
/*dst->bitlen = 0;*/
return 0;
}
slash = strchr(arg, '/');
if (slash)
*slash = '\0';
err = get_addr_1(dst, arg, family);
if (err == 0) {
dst->bitlen = (dst->family == AF_INET6) ? 128 : 32;
if (slash) {
inet_prefix netmask_pfx;
netmask_pfx.family = AF_UNSPEC;
plen = bb_strtou(slash + 1, NULL, 0);
if ((errno || plen > dst->bitlen)
&& (get_addr_1(&netmask_pfx, slash + 1, family)))
err = -1;
else if (netmask_pfx.family == AF_INET) {
/* fill in prefix length of dotted quad */
uint32_t mask = ntohl(netmask_pfx.data[0]);
uint32_t host = ~mask;
/* a valid netmask must be 2^n - 1 */
if (!(host & (host + 1))) {
for (plen = 0; mask; mask <<= 1)
++plen;
if (plen >= 0 && plen <= dst->bitlen) {
dst->bitlen = plen;
/* dst->flags |= PREFIXLEN_SPECIFIED; */
} else
err = -1;
} else
err = -1;
} else {
/* plain prefix */
dst->bitlen = plen;
}
}
}
if (slash)
*slash = '/';
return err;
}
int get_addr(inet_prefix *dst, char *arg, int family)
{
if (family == AF_PACKET) {
bb_error_msg_and_die("\"%s\" may be inet %s, but it is not allowed in this context", arg, "address");
}
if (get_addr_1(dst, arg, family)) {
bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "inet", "address", arg);
}
return 0;
}
int get_prefix(inet_prefix *dst, char *arg, int family)
{
if (family == AF_PACKET) {
bb_error_msg_and_die("\"%s\" may be inet %s, but it is not allowed in this context", arg, "prefix");
}
if (get_prefix_1(dst, arg, family)) {
bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "inet", "prefix", arg);
}
return 0;
}
uint32_t get_addr32(char *name)
{
inet_prefix addr;
if (get_addr_1(&addr, name, AF_INET)) {
bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "IP", "address", name);
}
return addr.data[0];
}
void incomplete_command(void)
{
bb_error_msg_and_die("command line is not complete, try option \"help\"");
}
void invarg(const char *arg, const char *opt)
{
bb_error_msg_and_die(bb_msg_invalid_arg, arg, opt);
}
void duparg(const char *key, const char *arg)
{
bb_error_msg_and_die("duplicate \"%s\": \"%s\" is the second value", key, arg);
}
void duparg2(const char *key, const char *arg)
{
bb_error_msg_and_die("either \"%s\" is duplicate, or \"%s\" is garbage", key, arg);
}
int inet_addr_match(inet_prefix *a, inet_prefix *b, int bits)
{
uint32_t *a1 = a->data;
uint32_t *a2 = b->data;
int words = bits >> 5;
bits &= 0x1f;
if (words)
if (memcmp(a1, a2, words << 2))
return -1;
if (bits) {
uint32_t w1, w2;
uint32_t mask;
w1 = a1[words];
w2 = a2[words];
mask = htonl((0xffffffff) << (0x20 - bits));
if ((w1 ^ w2) & mask)
return 1;
}
return 0;
}
const char *rt_addr_n2a(int af,
void *addr, char *buf, int buflen)
{
switch (af) {
case AF_INET:
case AF_INET6:
return inet_ntop(af, addr, buf, buflen);
default:
return "???";
}
}
#ifdef RESOLVE_HOSTNAMES
const char *format_host(int af, int len, void *addr, char *buf, int buflen)
{
if (resolve_hosts) {
struct hostent *h_ent;
if (len <= 0) {
switch (af) {
case AF_INET:
len = 4;
break;
case AF_INET6:
len = 16;
break;
default:;
}
}
if (len > 0) {
h_ent = gethostbyaddr(addr, len, af);
if (h_ent != NULL) {
safe_strncpy(buf, h_ent->h_name, buflen);
return buf;
}
}
}
return rt_addr_n2a(af, addr, buf, buflen);
}
#endif
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