busybox/networking/libiproute/utils.c

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/*
* utils.c
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*
* Changes:
*
* Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <resolv.h>
#include "./linux/pkt_sched.h"
#include "utils.h"
int get_integer(int *val, char *arg, int base)
{
long res;
char *ptr;
if (!arg || !*arg)
return -1;
res = strtol(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > INT_MAX || res < INT_MIN)
return -1;
*val = res;
return 0;
}
int get_unsigned(unsigned *val, char *arg, int base)
{
unsigned long res;
char *ptr;
if (!arg || !*arg)
return -1;
res = strtoul(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > UINT_MAX)
return -1;
*val = res;
return 0;
}
int get_u32(__u32 *val, char *arg, int base)
{
unsigned long res;
char *ptr;
if (!arg || !*arg)
return -1;
res = strtoul(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > 0xFFFFFFFFUL)
return -1;
*val = res;
return 0;
}
int get_u16(__u16 *val, char *arg, int base)
{
unsigned long res;
char *ptr;
if (!arg || !*arg)
return -1;
res = strtoul(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > 0xFFFF)
return -1;
*val = res;
return 0;
}
int get_u8(__u8 *val, char *arg, int base)
{
unsigned long res;
char *ptr;
if (!arg || !*arg)
return -1;
res = strtoul(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > 0xFF)
return -1;
*val = res;
return 0;
}
int get_s16(__s16 *val, char *arg, int base)
{
long res;
char *ptr;
if (!arg || !*arg)
return -1;
res = strtol(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > 0x7FFF || res < -0x8000)
return -1;
*val = res;
return 0;
}
int get_s8(__s8 *val, char *arg, int base)
{
long res;
char *ptr;
if (!arg || !*arg)
return -1;
res = strtol(arg, &ptr, base);
if (!ptr || ptr == arg || *ptr || res > 0x7F || res < -0x80)
return -1;
*val = res;
return 0;
}
int get_addr_1(inet_prefix *addr, char *name, int family)
{
char *cp;
unsigned char *ap = (unsigned char*)addr->data;
int i;
memset(addr, 0, sizeof(*addr));
if (strcmp(name, "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;
addr->bytelen = 4;
addr->bitlen = -1;
for (cp=name, i=0; *cp; cp++) {
if (*cp <= '9' && *cp >= '0') {
ap[i] = 10*ap[i] + (*cp-'0');
continue;
}
if (*cp == '.' && ++i <= 3)
continue;
return -1;
}
return 0;
}
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, "default") == 0 || strcmp(arg, "any") == 0) {
dst->family = family;
dst->bytelen = 0;
dst->bitlen = 0;
return 0;
}
slash = strchr(arg, '/');
if (slash)
*slash = 0;
err = get_addr_1(dst, arg, family);
if (err == 0) {
switch(dst->family) {
case AF_INET6:
dst->bitlen = 128;
break;
default:
case AF_INET:
dst->bitlen = 32;
}
if (slash) {
if (get_integer(&plen, slash+1, 0) || plen > dst->bitlen) {
err = -1;
goto done;
}
dst->bitlen = plen;
}
}
done:
if (slash)
*slash = '/';
return err;
}
int get_addr(inet_prefix *dst, char *arg, int family)
{
if (family == AF_PACKET) {
fprintf(stderr, "Error: \"%s\" may be inet address, but it is not allowed in this context.\n", arg);
exit(1);
}
if (get_addr_1(dst, arg, family)) {
fprintf(stderr, "Error: an inet address is expected rather than \"%s\".\n", arg);
exit(1);
}
return 0;
}
int get_prefix(inet_prefix *dst, char *arg, int family)
{
if (family == AF_PACKET) {
fprintf(stderr, "Error: \"%s\" may be inet prefix, but it is not allowed in this context.\n", arg);
exit(1);
}
if (get_prefix_1(dst, arg, family)) {
fprintf(stderr, "Error: an inet prefix is expected rather than \"%s\".\n", arg);
exit(1);
}
return 0;
}
__u32 get_addr32(char *name)
{
inet_prefix addr;
if (get_addr_1(&addr, name, AF_INET)) {
fprintf(stderr, "Error: an IP address is expected rather than \"%s\"\n", name);
exit(1);
}
return addr.data[0];
}
void incomplete_command()
{
fprintf(stderr, "Command line is not complete. Try option \"help\"\n");
exit(-1);
}
void invarg(char *msg, char *arg)
{
fprintf(stderr, "Error: argument \"%s\" is wrong: %s\n", arg, msg);
exit(-1);
}
void duparg(char *key, char *arg)
{
fprintf(stderr, "Error: duplicate \"%s\": \"%s\" is the second value.\n", key, arg);
exit(-1);
}
void duparg2(char *key, char *arg)
{
fprintf(stderr, "Error: either \"%s\" is duplicate, or \"%s\" is a garbage.\n", key, arg);
exit(-1);
}
int matches(char *cmd, char *pattern)
{
int len = strlen(cmd);
if (len > strlen(pattern))
return -1;
return memcmp(pattern, cmd, len);
}
int inet_addr_match(inet_prefix *a, inet_prefix *b, int bits)
{
__u32 *a1 = a->data;
__u32 *a2 = b->data;
int words = bits >> 0x05;
bits &= 0x1f;
if (words)
if (memcmp(a1, a2, words << 2))
return -1;
if (bits) {
__u32 w1, w2;
__u32 mask;
w1 = a1[words];
w2 = a2[words];
mask = htonl((0xffffffff) << (0x20 - bits));
if ((w1 ^ w2) & mask)
return 1;
}
return 0;
}
int __iproute2_hz_internal;
int __get_hz(void)
{
int hz = 0;
FILE *fp = fopen("/proc/net/psched", "r");
if (fp) {
unsigned nom, denom;
if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
if (nom == 1000000)
hz = denom;
fclose(fp);
}
if (hz)
return hz;
return HZ;
}
const char *rt_addr_n2a(int af, int len, void *addr, char *buf, int buflen)
{
switch (af) {
case AF_INET:
case AF_INET6:
return inet_ntop(af, addr, buf, buflen);
default:
return "???";
}
}
const char *format_host(int af, int len, void *addr, char *buf, int buflen)
{
#ifdef RESOLVE_HOSTNAMES
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)) != NULL) {
snprintf(buf, buflen-1, "%s", h_ent->h_name);
return buf;
}
}
#endif
return rt_addr_n2a(af, len, addr, buf, buflen);
}