mirror of
https://git.kernel.org/pub/scm/network/iproute2/iproute2.git
synced 2024-11-24 10:23:40 +08:00
531 lines
9.9 KiB
C
531 lines
9.9 KiB
C
/*
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* utils.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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*
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* Changes:
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*
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* Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <netdb.h>
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#include <arpa/inet.h>
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#include <resolv.h>
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#include <asm/types.h>
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#include <linux/pkt_sched.h>
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#include "utils.h"
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int get_integer(int *val, const char *arg, int base)
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{
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long res;
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char *ptr;
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if (!arg || !*arg)
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return -1;
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res = strtol(arg, &ptr, base);
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if (!ptr || ptr == arg || *ptr || res > INT_MAX || res < INT_MIN)
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return -1;
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*val = res;
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return 0;
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}
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int get_unsigned(unsigned *val, const char *arg, int base)
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{
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unsigned long res;
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char *ptr;
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if (!arg || !*arg)
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return -1;
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res = strtoul(arg, &ptr, base);
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if (!ptr || ptr == arg || *ptr || res > UINT_MAX)
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return -1;
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*val = res;
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return 0;
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}
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int get_u32(__u32 *val, const char *arg, int base)
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{
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unsigned long res;
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char *ptr;
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if (!arg || !*arg)
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return -1;
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res = strtoul(arg, &ptr, base);
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if (!ptr || ptr == arg || *ptr || res > 0xFFFFFFFFUL)
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return -1;
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*val = res;
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return 0;
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}
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int get_u16(__u16 *val, const char *arg, int base)
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{
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unsigned long res;
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char *ptr;
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if (!arg || !*arg)
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return -1;
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res = strtoul(arg, &ptr, base);
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if (!ptr || ptr == arg || *ptr || res > 0xFFFF)
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return -1;
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*val = res;
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return 0;
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}
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int get_u8(__u8 *val, const char *arg, int base)
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{
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unsigned long res;
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char *ptr;
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if (!arg || !*arg)
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return -1;
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res = strtoul(arg, &ptr, base);
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if (!ptr || ptr == arg || *ptr || res > 0xFF)
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return -1;
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*val = res;
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return 0;
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}
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int get_s16(__s16 *val, const char *arg, int base)
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{
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long res;
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char *ptr;
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if (!arg || !*arg)
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return -1;
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res = strtol(arg, &ptr, base);
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if (!ptr || ptr == arg || *ptr || res > 0x7FFF || res < -0x8000)
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return -1;
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*val = res;
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return 0;
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}
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int get_s8(__s8 *val, const char *arg, int base)
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{
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long res;
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char *ptr;
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if (!arg || !*arg)
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return -1;
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res = strtol(arg, &ptr, base);
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if (!ptr || ptr == arg || *ptr || res > 0x7F || res < -0x80)
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return -1;
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*val = res;
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return 0;
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}
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int get_addr_1(inet_prefix *addr, const char *name, int family)
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{
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const char *cp;
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unsigned char *ap = (unsigned char*)addr->data;
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int i;
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memset(addr, 0, sizeof(*addr));
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if (strcmp(name, "default") == 0 ||
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strcmp(name, "all") == 0 ||
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strcmp(name, "any") == 0) {
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if (family == AF_DECnet)
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return -1;
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addr->family = family;
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addr->bytelen = (family == AF_INET6 ? 16 : 4);
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addr->bitlen = -1;
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return 0;
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}
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if (strchr(name, ':')) {
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addr->family = AF_INET6;
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if (family != AF_UNSPEC && family != AF_INET6)
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return -1;
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if (inet_pton(AF_INET6, name, addr->data) <= 0)
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return -1;
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addr->bytelen = 16;
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addr->bitlen = -1;
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return 0;
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}
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if (family == AF_DECnet) {
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struct dn_naddr dna;
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addr->family = AF_DECnet;
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if (dnet_pton(AF_DECnet, name, &dna) <= 0)
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return -1;
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memcpy(addr->data, dna.a_addr, 2);
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addr->bytelen = 2;
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addr->bitlen = -1;
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return 0;
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}
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addr->family = AF_INET;
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if (family != AF_UNSPEC && family != AF_INET)
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return -1;
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addr->bytelen = 4;
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addr->bitlen = -1;
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for (cp=name, i=0; *cp; cp++) {
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if (*cp <= '9' && *cp >= '0') {
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ap[i] = 10*ap[i] + (*cp-'0');
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continue;
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}
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if (*cp == '.' && ++i <= 3)
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continue;
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return -1;
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}
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return 0;
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}
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int get_prefix_1(inet_prefix *dst, char *arg, int family)
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{
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int err;
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unsigned plen;
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char *slash;
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memset(dst, 0, sizeof(*dst));
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if (strcmp(arg, "default") == 0 ||
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strcmp(arg, "any") == 0 ||
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strcmp(arg, "all") == 0) {
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if (family == AF_DECnet)
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return -1;
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dst->family = family;
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dst->bytelen = 0;
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dst->bitlen = 0;
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return 0;
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}
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slash = strchr(arg, '/');
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if (slash)
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*slash = 0;
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err = get_addr_1(dst, arg, family);
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if (err == 0) {
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switch(dst->family) {
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case AF_INET6:
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dst->bitlen = 128;
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break;
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case AF_DECnet:
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dst->bitlen = 16;
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break;
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default:
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case AF_INET:
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dst->bitlen = 32;
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}
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if (slash) {
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if (get_integer(&plen, slash+1, 0) || plen > dst->bitlen) {
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err = -1;
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goto done;
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}
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dst->bitlen = plen;
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}
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}
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done:
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if (slash)
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*slash = '/';
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return err;
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}
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int get_addr(inet_prefix *dst, char *arg, int family)
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{
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if (family == AF_PACKET) {
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fprintf(stderr, "Error: \"%s\" may be inet address, but it is not allowed in this context.\n", arg);
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exit(1);
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}
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if (get_addr_1(dst, arg, family)) {
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fprintf(stderr, "Error: an inet address is expected rather than \"%s\".\n", arg);
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exit(1);
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}
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return 0;
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}
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int get_prefix(inet_prefix *dst, char *arg, int family)
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{
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if (family == AF_PACKET) {
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fprintf(stderr, "Error: \"%s\" may be inet prefix, but it is not allowed in this context.\n", arg);
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exit(1);
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}
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if (get_prefix_1(dst, arg, family)) {
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fprintf(stderr, "Error: an inet prefix is expected rather than \"%s\".\n", arg);
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exit(1);
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}
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return 0;
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}
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__u32 get_addr32(char *name)
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{
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inet_prefix addr;
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if (get_addr_1(&addr, name, AF_INET)) {
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fprintf(stderr, "Error: an IP address is expected rather than \"%s\"\n", name);
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exit(1);
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}
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return addr.data[0];
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}
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void incomplete_command(void)
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{
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fprintf(stderr, "Command line is not complete. Try option \"help\"\n");
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exit(-1);
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}
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void invarg(const char *msg, const char *arg)
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{
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fprintf(stderr, "Error: argument \"%s\" is wrong: %s\n", arg, msg);
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exit(-1);
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}
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void duparg(const char *key, const char *arg)
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{
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fprintf(stderr, "Error: duplicate \"%s\": \"%s\" is the second value.\n", key, arg);
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exit(-1);
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}
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void duparg2(const char *key, const char *arg)
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{
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fprintf(stderr, "Error: either \"%s\" is duplicate, or \"%s\" is a garbage.\n", key, arg);
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exit(-1);
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}
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int matches(const char *cmd, const char *pattern)
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{
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int len = strlen(cmd);
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if (len > strlen(pattern))
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return -1;
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return memcmp(pattern, cmd, len);
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}
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int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits)
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{
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__u32 *a1 = a->data;
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__u32 *a2 = b->data;
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int words = bits >> 0x05;
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bits &= 0x1f;
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if (words)
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if (memcmp(a1, a2, words << 2))
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return -1;
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if (bits) {
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__u32 w1, w2;
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__u32 mask;
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w1 = a1[words];
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w2 = a2[words];
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mask = htonl((0xffffffff) << (0x20 - bits));
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if ((w1 ^ w2) & mask)
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return 1;
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}
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return 0;
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}
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int __iproute2_hz_internal;
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int __get_hz(void)
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{
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char name[1024];
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int hz = 0;
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FILE *fp;
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if (getenv("HZ"))
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return atoi(getenv("HZ")) ? : HZ;
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if (getenv("PROC_NET_PSCHED")) {
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snprintf(name, sizeof(name)-1, "%s", getenv("PROC_NET_PSCHED"));
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} else if (getenv("PROC_ROOT")) {
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snprintf(name, sizeof(name)-1, "%s/net/psched", getenv("PROC_ROOT"));
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} else {
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strcpy(name, "/proc/net/psched");
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}
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fp = fopen(name, "r");
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if (fp) {
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unsigned nom, denom;
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if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
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if (nom == 1000000)
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hz = denom;
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fclose(fp);
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}
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if (hz)
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return hz;
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return HZ;
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}
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const char *rt_addr_n2a(int af, int len, const void *addr, char *buf, int buflen)
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{
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switch (af) {
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case AF_INET:
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case AF_INET6:
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return inet_ntop(af, addr, buf, buflen);
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case AF_IPX:
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return ipx_ntop(af, addr, buf, buflen);
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case AF_DECnet:
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{
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struct dn_naddr dna = { 2, { 0, 0, }};
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memcpy(dna.a_addr, addr, 2);
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return dnet_ntop(af, &dna, buf, buflen);
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}
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default:
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return "???";
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}
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}
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#ifdef RESOLVE_HOSTNAMES
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struct namerec
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{
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struct namerec *next;
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inet_prefix addr;
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char *name;
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};
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static struct namerec *nht[256];
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char *resolve_address(const char *addr, int len, int af)
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{
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struct namerec *n;
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struct hostent *h_ent;
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unsigned hash;
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static int notfirst;
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if (af == AF_INET6 && ((__u32*)addr)[0] == 0 &&
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((__u32*)addr)[1] == 0 && ((__u32*)addr)[2] == htonl(0xffff)) {
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af = AF_INET;
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addr += 12;
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len = 4;
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}
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hash = addr[len-1] ^ addr[len-2] ^ addr[len-3] ^ addr[len-4];
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for (n = nht[hash]; n; n = n->next) {
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if (n->addr.family == af &&
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n->addr.bytelen == len &&
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memcmp(n->addr.data, addr, len) == 0)
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return n->name;
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}
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if ((n = malloc(sizeof(*n))) == NULL)
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return NULL;
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n->addr.family = af;
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n->addr.bytelen = len;
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n->name = NULL;
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memcpy(n->addr.data, addr, len);
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n->next = nht[hash];
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nht[hash] = n;
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if (++notfirst == 1)
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sethostent(1);
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fflush(stdout);
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if ((h_ent = gethostbyaddr(addr, len, af)) != NULL)
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n->name = strdup(h_ent->h_name);
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/* Even if we fail, "negative" entry is remembered. */
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return n->name;
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}
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#endif
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const char *format_host(int af, int len, const void *addr,
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char *buf, int buflen)
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{
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#ifdef RESOLVE_HOSTNAMES
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if (resolve_hosts) {
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char *n;
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if (len <= 0) {
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switch (af) {
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case AF_INET:
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len = 4;
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break;
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case AF_INET6:
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len = 16;
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break;
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case AF_IPX:
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len = 10;
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break;
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#ifdef AF_DECnet
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/* I see no reasons why gethostbyname
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may not work for DECnet */
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case AF_DECnet:
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len = 2;
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break;
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#endif
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default: ;
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}
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}
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if (len > 0 &&
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(n = resolve_address(addr, len, af)) != NULL)
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return n;
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}
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#endif
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return rt_addr_n2a(af, len, addr, buf, buflen);
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}
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|
|
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__u8* hexstring_n2a(const __u8 *str, int len, __u8 *buf, int blen)
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{
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__u8 *ptr = buf;
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int i;
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for (i=0; i<len; i++) {
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if (blen < 3)
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break;
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sprintf(ptr, "%02x", str[i]);
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ptr += 2;
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blen -= 2;
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if (i != len-1 && blen > 1) {
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*ptr++ = ':';
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blen--;
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}
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}
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return buf;
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}
|
|
|
|
__u8* hexstring_a2n(const __u8 *str, __u8 *buf, int blen)
|
|
{
|
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int cnt = 0;
|
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|
|
for (;;) {
|
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unsigned acc;
|
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char ch;
|
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|
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acc = 0;
|
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|
|
while ((ch = *str) != ':' && ch != 0) {
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if (ch >= '0' && ch <= '9')
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ch -= '0';
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else if (ch >= 'a' && ch <= 'f')
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ch -= 'a'-10;
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else if (ch >= 'A' && ch <= 'F')
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ch -= 'A'-10;
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else
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return NULL;
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acc = (acc<<4) + ch;
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str++;
|
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}
|
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|
|
if (acc > 255)
|
|
return NULL;
|
|
if (cnt < blen) {
|
|
buf[cnt] = acc;
|
|
cnt++;
|
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}
|
|
if (ch == 0)
|
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break;
|
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++str;
|
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}
|
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if (cnt < blen)
|
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memset(buf+cnt, 0, blen-cnt);
|
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return buf;
|
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}
|