add owipcalc - a small ipv4 & ipv6 calculation utility
SVN-Revision: 32778
This commit is contained in:
Jo-Philipp Wich
parent
4d844e10ab
commit
542eed0143
3 changed files with 803 additions and 0 deletions
49
package/owipcalc/Makefile
Normal file
49
package/owipcalc/Makefile
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#
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# Copyright (C) 2012 Jo-Philipp Wich <jow@openwrt.org>
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#
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# This is free software, licensed under the Apache 2 license.
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#
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include $(TOPDIR)/rules.mk
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PKG_NAME:=owipcalc
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PKG_RELEASE:=1
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include $(INCLUDE_DIR)/package.mk
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define Package/owipcalc
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SECTION:=utils
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CATEGORY:=Utilities
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TITLE:=Simple IPv4/IPv6 address calculator
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MAINTAINER:=Jo-Philipp Wich <jow@openwrt.org>
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endef
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define Package/owipcalc/description
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The owipcalc utility supports a number of calculations and tests to work
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with ip-address ranges, this is useful for scripts that e.g. need to
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partition ipv6-prefixes into small subnets or to calculate address ranges
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for dhcp pools.
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endef
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define Build/Prepare
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$(INSTALL_DIR) $(PKG_BUILD_DIR)
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$(CP) ./src/* $(PKG_BUILD_DIR)/
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endef
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define Build/Configure
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endef
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define Build/Compile
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$(TARGET_CC) $(TARGET_CFLAGS) \
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-o $(PKG_BUILD_DIR)/owipcalc $(PKG_BUILD_DIR)/owipcalc.c
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endef
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define Package/owipcalc/install
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$(INSTALL_DIR) $(1)/usr/bin
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$(INSTALL_BIN) $(PKG_BUILD_DIR)/owipcalc $(1)/usr/bin/owipcalc
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endef
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$(eval $(call BuildPackage,owipcalc))
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BIN
package/owipcalc/src/owipcalc
Executable file
BIN
package/owipcalc/src/owipcalc
Executable file
Binary file not shown.
754
package/owipcalc/src/owipcalc.c
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754
package/owipcalc/src/owipcalc.c
Normal file
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@ -0,0 +1,754 @@
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/*
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* owipcalc - OpenWrt IP Calculator
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*
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* Copyright (C) 2012 Jo-Philipp Wich <jow@openwrt.org>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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struct cidr {
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uint8_t family;
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uint32_t prefix;
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union {
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struct in_addr v4;
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struct in6_addr v6;
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} addr;
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union {
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char v4[sizeof("255.255.255.255/255.255.255.255 ")];
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char v6[sizeof("FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF/128 ")];
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} buf;
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};
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struct op {
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const char *name;
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const char *desc;
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struct {
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bool (*a1)(struct cidr *a);
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bool (*a2)(struct cidr *a, struct cidr *b);
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} f4;
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struct {
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bool (*a1)(struct cidr *a);
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bool (*a2)(struct cidr *a, struct cidr *b);
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} f6;
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};
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static bool quiet = false;
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static bool printed = false;
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static struct cidr * cidr_parse4(const char *s)
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{
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char *p = NULL, *r;
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struct in_addr mask;
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struct cidr *addr = malloc(sizeof(struct cidr));
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if (!addr || (strlen(s) >= sizeof(addr->buf.v4)))
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goto err;
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snprintf(addr->buf.v4, sizeof(addr->buf.v4), "%s", s);
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addr->family = AF_INET;
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if ((p = strchr(addr->buf.v4, '/')) != NULL)
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{
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*p++ = 0;
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if (strchr(p, '.') != NULL)
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{
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if (inet_pton(AF_INET, p, &mask) != 1)
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goto err;
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for (addr->prefix = 0; mask.s_addr; mask.s_addr >>= 1)
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addr->prefix += (mask.s_addr & 1);
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}
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else
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{
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addr->prefix = strtoul(p, &r, 10);
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if ((p == r) || (*r != 0) || (addr->prefix > 32))
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goto err;
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}
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}
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else
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{
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addr->prefix = 32;
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}
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if (p == addr->buf.v4+1)
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memset(&addr->addr.v4, 0, sizeof(addr->addr.v4));
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else if (inet_pton(AF_INET, addr->buf.v4, &addr->addr.v4) != 1)
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goto err;
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return addr;
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err:
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if (addr)
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free(addr);
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return NULL;
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}
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static bool cidr_add4(struct cidr *a, struct cidr *b)
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{
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uint32_t x = ntohl(a->addr.v4.s_addr);
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uint32_t y = ntohl(b->addr.v4.s_addr);
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if ((a->family != AF_INET) || (b->family != AF_INET))
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return false;
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if ((uint32_t)(x + y) < x)
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{
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fprintf(stderr, "overflow during 'add'\n");
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return false;
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}
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a->addr.v4.s_addr = htonl(x + y);
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return true;
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}
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static bool cidr_sub4(struct cidr *a, struct cidr *b)
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{
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uint32_t x = ntohl(a->addr.v4.s_addr);
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uint32_t y = ntohl(b->addr.v4.s_addr);
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if ((a->family != AF_INET) || (b->family != AF_INET))
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return false;
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if ((uint32_t)(x - y) > x)
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{
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fprintf(stderr, "underflow during 'sub'\n");
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return false;
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}
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a->addr.v4.s_addr = htonl(x - y);
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return true;
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}
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static bool cidr_network4(struct cidr *a)
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{
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a->addr.v4.s_addr &= htonl(~((1 << (32 - a->prefix)) - 1));
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a->prefix = 32;
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return true;
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}
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static bool cidr_broadcast4(struct cidr *a)
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{
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a->addr.v4.s_addr |= htonl(((1 << (32 - a->prefix)) - 1));
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a->prefix = 32;
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return true;
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}
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static bool cidr_contains4(struct cidr *a, struct cidr *b)
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{
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uint32_t net1 = a->addr.v4.s_addr & htonl(~((1 << (32 - a->prefix)) - 1));
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uint32_t net2 = b->addr.v4.s_addr & htonl(~((1 << (32 - a->prefix)) - 1));
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printed = true;
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if ((b->prefix >= a->prefix) && (net1 == net2))
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{
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if (!quiet) printf("1\n");
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return true;
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}
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else
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{
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if (!quiet) printf("0\n");
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return false;
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}
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}
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static bool cidr_netmask4(struct cidr *a)
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{
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struct in_addr mask;
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char buf[sizeof("255.255.255.255 ")];
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mask.s_addr = htonl(~((1 << (32 - a->prefix)) - 1));
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if (!quiet)
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printf("%s\n", inet_ntop(AF_INET, &mask, buf, sizeof(buf)));
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printed = true;
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return true;
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}
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static bool cidr_private4(struct cidr *a)
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{
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uint32_t x = ntohl(a->addr.v4.s_addr);
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printed = true;
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if (((x >= 0x0A000000) && (x <= 0x0AFFFFFF)) ||
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((x >= 0xAC100000) && (x <= 0xAC1FFFFF)) ||
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((x >= 0xC0A80000) && (x <= 0xC0A8FFFF)))
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{
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if (!quiet) printf("1\n");
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return true;
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}
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else
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{
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if (!quiet) printf("0\n");
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return false;
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}
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}
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static bool cidr_linklocal4(struct cidr *a)
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{
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uint32_t x = ntohl(a->addr.v4.s_addr);
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printed = true;
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if ((x >= 0xA9FE0000) && (x <= 0xA9FEFFFF))
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{
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if (!quiet) printf("1\n");
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return true;
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}
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else
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{
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if (!quiet) printf("0\n");
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return false;
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}
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}
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static bool cidr_print4(struct cidr *a)
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{
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char *p;
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if (a->family != AF_INET)
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return false;
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if (!(p = (char *)inet_ntop(AF_INET, &a->addr.v4, a->buf.v4, sizeof(a->buf.v4))))
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return false;
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if (!quiet)
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printf("%s", p);
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if (!quiet && (a->prefix < 32))
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printf("/%u", a->prefix);
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if (!quiet)
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printf("\n");
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printed = true;
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return true;
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}
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static struct cidr * cidr_parse6(const char *s)
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{
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char *p = NULL, *r;
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struct cidr *addr = malloc(sizeof(struct cidr));
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if (!addr || (strlen(s) >= sizeof(addr->buf.v6)))
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goto err;
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snprintf(addr->buf.v6, sizeof(addr->buf.v6), "%s", s);
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addr->family = AF_INET6;
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if ((p = strchr(addr->buf.v6, '/')) != NULL)
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{
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*p++ = 0;
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addr->prefix = strtoul(p, &r, 10);
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if ((p == r) || (*r != 0) || (addr->prefix > 128))
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goto err;
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}
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else
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{
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addr->prefix = 128;
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}
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if (p == addr->buf.v6+1)
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memset(&addr->addr.v6, 0, sizeof(addr->addr.v6));
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else if (inet_pton(AF_INET6, addr->buf.v6, &addr->addr.v6) != 1)
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goto err;
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return addr;
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err:
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if (addr)
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free(addr);
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return NULL;
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}
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static bool cidr_add6(struct cidr *a, struct cidr *b)
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{
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uint8_t idx = 15, carry = 0, overflow = 0;
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struct in6_addr *x = &a->addr.v6;
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struct in6_addr *y = &b->addr.v6;
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if ((a->family != AF_INET6) || (b->family != AF_INET6))
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return false;
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do {
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overflow = !!((x->s6_addr[idx] + y->s6_addr[idx] + carry) >= 256);
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x->s6_addr[idx] += y->s6_addr[idx] + carry;
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carry = overflow;
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}
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while (idx-- > 0);
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if (carry)
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{
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fprintf(stderr, "overflow during 'add'\n");
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return false;
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}
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return true;
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}
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static bool cidr_sub6(struct cidr *a, struct cidr *b)
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{
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uint8_t idx = 15, carry = 0, underflow = 0;
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struct in6_addr *x = &a->addr.v6;
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struct in6_addr *y = &b->addr.v6;
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if ((a->family != AF_INET6) || (b->family != AF_INET6))
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return false;
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do {
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underflow = !!((x->s6_addr[idx] - y->s6_addr[idx] - carry) < 0);
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x->s6_addr[idx] -= y->s6_addr[idx] + carry;
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carry = underflow;
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}
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while (idx-- > 0);
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if (carry)
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{
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fprintf(stderr, "underflow during 'sub'\n");
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return false;
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}
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return true;
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}
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static bool cidr_network6(struct cidr *a)
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{
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uint8_t i;
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for (i = 0; i < (128 - a->prefix) / 8; i++)
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a->addr.v6.s6_addr[15-i] = 0;
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if ((128 - a->prefix) % 8)
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a->addr.v6.s6_addr[15-i] &= ~((1 << ((128 - a->prefix) % 8)) - 1);
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return true;
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}
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static bool cidr_contains6(struct cidr *a, struct cidr *b)
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{
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struct in6_addr *x = &a->addr.v6;
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struct in6_addr *y = &b->addr.v6;
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uint8_t i = (128 - a->prefix) / 8;
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uint8_t m = ~((1 << ((128 - a->prefix) % 8)) - 1);
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uint8_t net1 = x->s6_addr[15-i] & m;
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uint8_t net2 = y->s6_addr[15-i] & m;
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printed = true;
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if ((b->prefix >= a->prefix) && (net1 == net2) &&
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((i == 15) || !memcmp(&x->s6_addr, &y->s6_addr, 15-i)))
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{
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if (!quiet) printf("1\n");
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return true;
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}
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else
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{
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if (!quiet) printf("0\n");
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return false;
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}
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}
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static bool cidr_linklocal6(struct cidr *a)
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{
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printed = true;
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if ((a->addr.v6.s6_addr[0] == 0xFE) &&
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(a->addr.v6.s6_addr[1] >= 0x80) &&
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(a->addr.v6.s6_addr[1] <= 0xBF))
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{
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if (!quiet) printf("1\n");
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return true;
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}
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else
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{
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if (!quiet) printf("0\n");
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return false;
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}
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}
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static bool cidr_ula6(struct cidr *a)
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{
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printed = true;
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if ((a->addr.v6.s6_addr[0] >= 0xFC) &&
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(a->addr.v6.s6_addr[0] <= 0xFD))
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{
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if (!quiet) printf("1\n");
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return true;
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}
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else
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{
|
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if (!quiet) printf("0\n");
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return false;
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}
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}
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static bool cidr_print6(struct cidr *a)
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{
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char *p;
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if (a->family != AF_INET6)
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return NULL;
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if (!(p = (char *)inet_ntop(AF_INET6, &a->addr.v6, a->buf.v6, sizeof(a->buf.v6))))
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return false;
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if (!quiet)
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printf("%s", p);
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if (!quiet && (a->prefix < 128))
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printf("/%u", a->prefix);
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if (!quiet)
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printf("\n");
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printed = true;
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return true;
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}
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|
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static struct cidr * cidr_parse(const char *op, const char *s, int af_hint)
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{
|
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char *r;
|
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struct cidr *a;
|
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|
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uint8_t i;
|
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uint32_t sum = strtoul(s, &r, 0);
|
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|
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if ((r > s) && (*r == 0))
|
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{
|
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a = malloc(sizeof(struct cidr));
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|
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if (!a)
|
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return NULL;
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|
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if (af_hint == AF_INET)
|
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{
|
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a->family = AF_INET;
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a->prefix = 32;
|
||||
a->addr.v4.s_addr = htonl(sum);
|
||||
}
|
||||
else
|
||||
{
|
||||
a->family = AF_INET6;
|
||||
a->prefix = 128;
|
||||
|
||||
for (i = 0; i <= 15; i++)
|
||||
{
|
||||
a->addr.v6.s6_addr[15-i] = sum % 256;
|
||||
sum >>= 8;
|
||||
}
|
||||
}
|
||||
|
||||
return a;
|
||||
}
|
||||
|
||||
if (strchr(s, ':'))
|
||||
a = cidr_parse6(s);
|
||||
else
|
||||
a = cidr_parse4(s);
|
||||
|
||||
if (!a)
|
||||
return NULL;
|
||||
|
||||
if (a->family != af_hint)
|
||||
{
|
||||
fprintf(stderr, "attempt to '%s' %s with %s address\n",
|
||||
op,
|
||||
(af_hint == AF_INET) ? "ipv4" : "ipv6",
|
||||
(af_hint != AF_INET) ? "ipv4" : "ipv6");
|
||||
exit(4);
|
||||
}
|
||||
|
||||
return a;
|
||||
}
|
||||
|
||||
static bool cidr_howmany(struct cidr *a, struct cidr *b)
|
||||
{
|
||||
if (!quiet)
|
||||
{
|
||||
if (b->prefix < a->prefix)
|
||||
printf("0\n");
|
||||
else
|
||||
printf("%u\n", 1 << (b->prefix - a->prefix));
|
||||
}
|
||||
|
||||
printed = true;
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
static bool cidr_quiet(struct cidr *a)
|
||||
{
|
||||
quiet = true;
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
struct op ops[] = {
|
||||
{ .name = "add",
|
||||
.desc = "Add argument to base address",
|
||||
.f4.a2 = cidr_add4,
|
||||
.f6.a2 = cidr_add6 },
|
||||
|
||||
{ .name = "sub",
|
||||
.desc = "Substract argument from base address",
|
||||
.f4.a2 = cidr_sub4,
|
||||
.f6.a2 = cidr_sub6 },
|
||||
|
||||
{ .name = "network",
|
||||
.desc = "Turn base address into network address",
|
||||
.f4.a1 = cidr_network4,
|
||||
.f6.a1 = cidr_network6 },
|
||||
|
||||
{ .name = "broadcast",
|
||||
.desc = "Turn base address into broadcast address",
|
||||
.f4.a1 = cidr_broadcast4 },
|
||||
|
||||
{ .name = "netmask",
|
||||
.desc = "Print netmask of base address, does not change base address",
|
||||
.f4.a1 = cidr_netmask4 },
|
||||
|
||||
{ .name = "howmany",
|
||||
.desc = "Print amount of righ-hand prefixes that fit into base address, "
|
||||
"does not change base address",
|
||||
.f4.a2 = cidr_howmany,
|
||||
.f6.a2 = cidr_howmany },
|
||||
|
||||
{ .name = "contains",
|
||||
.desc = "Print '1' if argument fits into base address or '0' "
|
||||
"if not, does not change base address",
|
||||
.f4.a2 = cidr_contains4,
|
||||
.f6.a2 = cidr_contains6 },
|
||||
|
||||
{ .name = "private",
|
||||
.desc = "Print '1' if base address is in RFC1918 private space or '0' "
|
||||
"if not, does not change base address",
|
||||
.f4.a1 = cidr_private4 },
|
||||
|
||||
{ .name = "linklocal",
|
||||
.desc = "Print '1' if base address is in 169.254.0.0/16 or FE80::/10 "
|
||||
"link local space or '0' if not, does not change base address",
|
||||
.f4.a1 = cidr_linklocal4,
|
||||
.f6.a1 = cidr_linklocal6 },
|
||||
|
||||
{ .name = "ula",
|
||||
.desc = "Print '1' if base address is in FC00::/7 unique local address "
|
||||
"(ULA) space or '0' if not, does not change base address",
|
||||
.f6.a1 = cidr_ula6 },
|
||||
|
||||
{ .name = "quiet",
|
||||
.desc = "Suppress output, useful for test operation where the result can "
|
||||
"be inferred from the exit code, does not change base address",
|
||||
.f4.a1 = cidr_quiet,
|
||||
.f6.a1 = cidr_quiet },
|
||||
|
||||
{ .name = "print",
|
||||
.desc = "Print intermediate result, invoked implicitely at the end of "
|
||||
"calculation if no intermediate prints happened",
|
||||
.f4.a1 = cidr_print4,
|
||||
.f6.a1 = cidr_print6 },
|
||||
};
|
||||
|
||||
static void usage(const char *prog)
|
||||
{
|
||||
int i;
|
||||
|
||||
fprintf(stderr,
|
||||
"\n"
|
||||
"Usage:\n\n"
|
||||
" %s {base address} operation [argument] "
|
||||
"[operation [argument] ...]\n\n"
|
||||
"Operations:\n\n",
|
||||
prog);
|
||||
|
||||
for (i = 0; i < sizeof(ops) / sizeof(ops[0]); i++)
|
||||
{
|
||||
if (ops[i].f4.a2 || ops[i].f6.a2)
|
||||
{
|
||||
fprintf(stderr, " %s %s\n",
|
||||
ops[i].name,
|
||||
(ops[i].f4.a2 && ops[i].f6.a2) ? "{ipv4/ipv6/amount}" :
|
||||
(ops[i].f6.a2 ? "{ipv6/amount}" : "{ipv4/amount}"));
|
||||
}
|
||||
else
|
||||
{
|
||||
fprintf(stderr, " %s\n", ops[i].name);
|
||||
}
|
||||
|
||||
fprintf(stderr, " %s.\n", ops[i].desc);
|
||||
|
||||
if ((ops[i].f4.a1 && ops[i].f6.a1) || (ops[i].f4.a2 && ops[i].f6.a2))
|
||||
fprintf(stderr, " Applicable to ipv4- and ipv6-addresses.\n\n");
|
||||
else if (ops[i].f6.a2 || ops[i].f6.a1)
|
||||
fprintf(stderr, " Only applicable to ipv6-addresses.\n\n");
|
||||
else
|
||||
fprintf(stderr, " Only applicable to ipv4-addresses.\n\n");
|
||||
}
|
||||
|
||||
fprintf(stderr,
|
||||
"Examples:\n\n"
|
||||
" Calculate a DHCP range:\n\n"
|
||||
" $ %s 192.168.1.1/255.255.255.0 network add 100 print add 150 print\n"
|
||||
" 192.168.1.100\n"
|
||||
" 192.168.1.250\n\n"
|
||||
" Count number of prefixes:\n\n"
|
||||
" $ %s 2001:0DB8:FDEF::/48 howmany ::/64\n"
|
||||
" 65536\n\n",
|
||||
prog, prog);
|
||||
|
||||
exit(1);
|
||||
}
|
||||
|
||||
static bool runop(struct cidr *a, char ***arg, int *status)
|
||||
{
|
||||
int i;
|
||||
char *arg1 = **arg;
|
||||
char *arg2 = *(*arg+1);
|
||||
struct cidr *b = NULL;
|
||||
|
||||
if (!arg1)
|
||||
return false;
|
||||
|
||||
for (i = 0; i < sizeof(ops) / sizeof(ops[0]); i++)
|
||||
{
|
||||
if (!strcmp(ops[i].name, arg1))
|
||||
{
|
||||
if (ops[i].f4.a2 || ops[i].f6.a2)
|
||||
{
|
||||
if (!arg2)
|
||||
{
|
||||
fprintf(stderr, "'%s' requires an argument\n",
|
||||
ops[i].name);
|
||||
|
||||
*status = 2;
|
||||
return false;
|
||||
}
|
||||
|
||||
b = cidr_parse(ops[i].name, arg2, a->family);
|
||||
|
||||
if (!b)
|
||||
{
|
||||
fprintf(stderr, "invalid address argument for '%s'\n",
|
||||
ops[i].name);
|
||||
|
||||
*status = 3;
|
||||
return false;
|
||||
}
|
||||
|
||||
*arg += 2;
|
||||
|
||||
if (((a->family == AF_INET) && !ops[i].f4.a2) ||
|
||||
((a->family == AF_INET6) && !ops[i].f6.a2))
|
||||
{
|
||||
fprintf(stderr, "'%s' not supported for %s addresses\n",
|
||||
ops[i].name,
|
||||
(a->family == AF_INET) ? "ipv4" : "ipv6");
|
||||
|
||||
*status = 5;
|
||||
return false;
|
||||
}
|
||||
|
||||
*status = !((a->family == AF_INET) ? ops[i].f4.a2(a, b)
|
||||
: ops[i].f6.a2(a, b));
|
||||
|
||||
return true;
|
||||
}
|
||||
else
|
||||
{
|
||||
*arg += 1;
|
||||
|
||||
if (((a->family == AF_INET) && !ops[i].f4.a1) ||
|
||||
((a->family == AF_INET6) && !ops[i].f6.a1))
|
||||
{
|
||||
fprintf(stderr, "'%s' not supported for %s addresses\n",
|
||||
ops[i].name,
|
||||
(a->family == AF_INET) ? "ipv4" : "ipv6");
|
||||
|
||||
*status = 5;
|
||||
return false;
|
||||
}
|
||||
|
||||
*status = !((a->family == AF_INET) ? ops[i].f4.a1(a)
|
||||
: ops[i].f6.a1(a));
|
||||
|
||||
return true;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
int status = 0;
|
||||
char **arg = argv+2;
|
||||
struct cidr *a;
|
||||
|
||||
if (argc < 3)
|
||||
usage(argv[0]);
|
||||
|
||||
a = strchr(argv[1], ':') ? cidr_parse6(argv[1]) : cidr_parse4(argv[1]);
|
||||
|
||||
if (!a)
|
||||
usage(argv[0]);
|
||||
|
||||
while (runop(a, &arg, &status));
|
||||
|
||||
if (*arg)
|
||||
{
|
||||
fprintf(stderr, "unknown operation '%s'\n", *arg);
|
||||
exit(6);
|
||||
}
|
||||
|
||||
if (!printed && (status < 2))
|
||||
{
|
||||
if (a->family == AF_INET)
|
||||
cidr_print4(a);
|
||||
else
|
||||
cidr_print6(a);
|
||||
}
|
||||
|
||||
exit(status);
|
||||
}
|
||||
Loading…
Reference in a new issue