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-rw-r--r--userspace/arptables/arptables.c2452
1 files changed, 2452 insertions, 0 deletions
diff --git a/userspace/arptables/arptables.c b/userspace/arptables/arptables.c
new file mode 100644
index 0000000..a7d94a0
--- /dev/null
+++ b/userspace/arptables/arptables.c
@@ -0,0 +1,2452 @@
+/* Code to take an arptables-style command line and do it. */
+
+/*
+ * arptables:
+ * Author: Bart De Schuymer <bdschuym@pandora.be>, but
+ * almost all code is from the iptables userspace program, which has main
+ * authors: Paul.Russell@rustcorp.com.au and mneuling@radlogic.com.au
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/*
+ Currently, only support for specifying hardware addresses for Ethernet
+ is available. We actually set the hardware_length to 6 when hardware
+ addresses are specified (mask is set to 0).
+ This tool is not luser-proof: you can specify an Ethernet source address
+ and set hardware length to something different than 6, f.e.
+*/
+
+#include <getopt.h>
+#include <string.h>
+#include <netdb.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <dlfcn.h>
+#include <ctype.h>
+#include <stdarg.h>
+#include <limits.h>
+#include <unistd.h>
+#include <arptables.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#ifndef ARPT_LIB_DIR
+#define ARPT_LIB_DIR "/usr/local/lib/arptables"
+#endif
+
+#ifndef PROC_SYS_MODPROBE
+#define PROC_SYS_MODPROBE "/proc/sys/kernel/modprobe"
+#endif
+
+#define FMT_NUMERIC 0x0001
+#define FMT_NOCOUNTS 0x0002
+#define FMT_KILOMEGAGIGA 0x0004
+#define FMT_OPTIONS 0x0008
+#define FMT_NOTABLE 0x0010
+#define FMT_NOTARGET 0x0020
+#define FMT_VIA 0x0040
+#define FMT_NONEWLINE 0x0080
+#define FMT_LINENUMBERS 0x0100
+
+#define FMT_PRINT_RULE (FMT_NOCOUNTS | FMT_OPTIONS | FMT_VIA \
+ | FMT_NUMERIC | FMT_NOTABLE)
+#define FMT(tab,notab) ((format) & FMT_NOTABLE ? (notab) : (notab))
+
+
+#define CMD_NONE 0x0000U
+#define CMD_INSERT 0x0001U
+#define CMD_DELETE 0x0002U
+#define CMD_DELETE_NUM 0x0004U
+#define CMD_REPLACE 0x0008U
+#define CMD_APPEND 0x0010U
+#define CMD_LIST 0x0020U
+#define CMD_FLUSH 0x0040U
+#define CMD_ZERO 0x0080U
+#define CMD_NEW_CHAIN 0x0100U
+#define CMD_DELETE_CHAIN 0x0200U
+#define CMD_SET_POLICY 0x0400U
+#define CMD_CHECK 0x0800U
+#define CMD_RENAME_CHAIN 0x1000U
+#define NUMBER_OF_CMD 13
+static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z',
+ 'N', 'X', 'P', 'E' };
+
+#define OPTION_OFFSET 256
+
+#define OPT_NONE 0x00000U
+#define OPT_NUMERIC 0x00001U
+#define OPT_S_IP 0x00002U
+#define OPT_D_IP 0x00004U
+#define OPT_S_MAC 0x00008U
+#define OPT_D_MAC 0x00010U
+#define OPT_H_LENGTH 0x00020U
+#define OPT_OPCODE 0x00040U
+#define OPT_H_TYPE 0x00080U
+#define OPT_P_TYPE 0x00100U
+#define OPT_JUMP 0x00200U
+#define OPT_VERBOSE 0x00400U
+#define OPT_VIANAMEIN 0x00800U
+#define OPT_VIANAMEOUT 0x01000U
+#define OPT_LINENUMBERS 0x02000U
+#define OPT_COUNTERS 0x04000U
+#define NUMBER_OF_OPT 15
+static const char optflags[NUMBER_OF_OPT]
+= { 'n', 's', 'd', 2, 3, 'l', 4, 5, 6, 'j', 'v', 'i', 'o', '0', 'c'};
+
+static struct option original_opts[] = {
+ { "append", 1, 0, 'A' },
+ { "delete", 1, 0, 'D' },
+ { "insert", 1, 0, 'I' },
+ { "replace", 1, 0, 'R' },
+ { "list", 2, 0, 'L' },
+ { "flush", 2, 0, 'F' },
+ { "zero", 2, 0, 'Z' },
+ { "new-chain", 1, 0, 'N' },
+ { "delete-chain", 2, 0, 'X' },
+ { "rename-chain", 1, 0, 'E' },
+ { "policy", 1, 0, 'P' },
+ { "source-ip", 1, 0, 's' },
+ { "destination-ip", 1, 0, 'd' },
+ { "src-ip", 1, 0, 's' },
+ { "dst-ip", 1, 0, 'd' },
+ { "source-mac", 1, 0, 2},
+ { "destination-mac", 1, 0, 3},
+ { "src-mac", 1, 0, 2},
+ { "dst-mac", 1, 0, 3},
+ { "h-length", 1, 0, 'l' },
+ { "opcode", 1, 0, 4 },
+ { "h-type", 1, 0, 5 },
+ { "proto-type", 1, 0, 6 },
+ { "in-interface", 1, 0, 'i' },
+ { "jump", 1, 0, 'j' },
+ { "table", 1, 0, 't' },
+ { "match", 1, 0, 'm' },
+ { "numeric", 0, 0, 'n' },
+ { "out-interface", 1, 0, 'o' },
+ { "verbose", 0, 0, 'v' },
+ { "exact", 0, 0, 'x' },
+ { "version", 0, 0, 'V' },
+ { "help", 2, 0, 'h' },
+ { "line-numbers", 0, 0, '0' },
+ { "modprobe", 1, 0, 'M' },
+ { 0 }
+};
+
+/*#ifndef __OPTIMIZE__
+struct arpt_entry_target *
+arpt_get_target(struct arpt_entry *e)
+{
+ return (void *)e + e->target_offset;
+}
+#endif*/
+
+static struct option *opts = original_opts;
+static unsigned int global_option_offset = 0;
+
+/* Table of legal combinations of commands and options. If any of the
+ * given commands make an option legal, that option is legal (applies to
+ * CMD_LIST and CMD_ZERO only).
+ * Key:
+ * + compulsory
+ * x illegal
+ * optional
+ */
+
+static char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] =
+/* Well, it's better than "Re: Linux vs FreeBSD" */
+{
+ /* -n -s -d -p -j -v -x -i -o -f --line */
+/*INSERT*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '},
+/*DELETE*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '},
+/*DELETE_NUM*/{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '},
+/*REPLACE*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '},
+/*APPEND*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '},
+/*LIST*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '},
+/*FLUSH*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '},
+/*ZERO*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '},
+/*NEW_CHAIN*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '},
+/*DEL_CHAIN*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '},
+/*SET_POLICY*/{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '},
+/*CHECK*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '},
+/*RENAME*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}
+};
+
+static int inverse_for_options[NUMBER_OF_OPT] =
+{
+/* -n */ 0,
+/* -s */ ARPT_INV_SRCIP,
+/* -d */ ARPT_INV_TGTIP,
+/* 2 */ ARPT_INV_SRCDEVADDR,
+/* 3 */ ARPT_INV_TGTDEVADDR,
+/* -l */ ARPT_INV_ARPHLN,
+/* 4 */ ARPT_INV_ARPOP,
+/* 5 */ ARPT_INV_ARPHRD,
+/* 6 */ ARPT_INV_ARPPRO,
+/* -j */ 0,
+/* -v */ 0,
+/* -i */ ARPT_INV_VIA_IN,
+/* -o */ ARPT_INV_VIA_OUT,
+/*--line*/ 0,
+/* -c */ 0,
+};
+
+const char *program_version = ARPTABLES_VERSION;
+const char *program_name;
+
+/* Keeping track of external matches and targets: linked lists. */
+struct arptables_match *arptables_matches = NULL;
+struct arptables_target *arptables_targets = NULL;
+
+/* Extra debugging from libarptc */
+extern void dump_entries(const arptc_handle_t handle);
+
+/* A few hardcoded protocols for 'all' and in case the user has no
+ /etc/protocols */
+struct pprot {
+ char *name;
+ u_int8_t num;
+};
+
+/* Primitive headers... */
+/* defined in netinet/in.h */
+#if 0
+#ifndef IPPROTO_ESP
+#define IPPROTO_ESP 50
+#endif
+#ifndef IPPROTO_AH
+#define IPPROTO_AH 51
+#endif
+#endif
+
+/***********************************************/
+/* ARPTABLES SPECIFIC NEW FUNCTIONS ADDED HERE */
+/***********************************************/
+
+unsigned char mac_type_unicast[ETH_ALEN] = {0,0,0,0,0,0};
+unsigned char msk_type_unicast[ETH_ALEN] = {1,0,0,0,0,0};
+unsigned char mac_type_multicast[ETH_ALEN] = {1,0,0,0,0,0};
+unsigned char msk_type_multicast[ETH_ALEN] = {1,0,0,0,0,0};
+unsigned char mac_type_broadcast[ETH_ALEN] = {255,255,255,255,255,255};
+unsigned char msk_type_broadcast[ETH_ALEN] = {255,255,255,255,255,255};
+
+/* a few names */
+static char *opcodes[] =
+{
+ "Request",
+ "Reply",
+ "Request_Reverse",
+ "Reply_Reverse",
+ "DRARP_Request",
+ "DRARP_Reply",
+ "DRARP_Error",
+ "InARP_Request",
+ "ARP_NAK",
+};
+#define NUMOPCODES 9
+
+/*
+ * put the mac address into 6 (ETH_ALEN) bytes
+ */
+int getmac_and_mask(char *from, char *to, char *mask)
+{
+ char *p;
+ int i;
+ struct ether_addr *addr;
+
+ if (strcasecmp(from, "Unicast") == 0) {
+ memcpy(to, mac_type_unicast, ETH_ALEN);
+ memcpy(mask, msk_type_unicast, ETH_ALEN);
+ return 0;
+ }
+ if (strcasecmp(from, "Multicast") == 0) {
+ memcpy(to, mac_type_multicast, ETH_ALEN);
+ memcpy(mask, msk_type_multicast, ETH_ALEN);
+ return 0;
+ }
+ if (strcasecmp(from, "Broadcast") == 0) {
+ memcpy(to, mac_type_broadcast, ETH_ALEN);
+ memcpy(mask, msk_type_broadcast, ETH_ALEN);
+ return 0;
+ }
+ if ( (p = strrchr(from, '/')) != NULL) {
+ *p = '\0';
+ if (!(addr = ether_aton(p + 1)))
+ return -1;
+ memcpy(mask, addr, ETH_ALEN);
+ } else
+ memset(mask, 0xff, ETH_ALEN);
+ if (!(addr = ether_aton(from)))
+ return -1;
+ memcpy(to, addr, ETH_ALEN);
+ for (i = 0; i < ETH_ALEN; i++)
+ to[i] &= mask[i];
+ return 0;
+}
+
+int getlength_and_mask(char *from, uint8_t *to, uint8_t *mask)
+{
+ char *p, *buffer;
+ int i;
+
+ if ( (p = strrchr(from, '/')) != NULL) {
+ *p = '\0';
+ i = strtol(p+1, &buffer, 10);
+ if (*buffer != '\0' || i < 0 || i > 255)
+ return -1;
+ *mask = (uint8_t)i;
+ } else
+ *mask = 255;
+ i = strtol(from, &buffer, 10);
+ if (*buffer != '\0' || i < 0 || i > 255)
+ return -1;
+ *to = (uint8_t)i;
+ return 0;
+}
+
+int get16_and_mask(char *from, uint16_t *to, uint16_t *mask, int base)
+{
+ char *p, *buffer;
+ int i;
+
+ if ( (p = strrchr(from, '/')) != NULL) {
+ *p = '\0';
+ i = strtol(p+1, &buffer, base);
+ if (*buffer != '\0' || i < 0 || i > 65535)
+ return -1;
+ *mask = htons((uint16_t)i);
+ } else
+ *mask = 65535;
+ i = strtol(from, &buffer, base);
+ if (*buffer != '\0' || i < 0 || i > 65535)
+ return -1;
+ *to = htons((uint16_t)i);
+ return 0;
+}
+
+void print_mac(const unsigned char *mac, int l)
+{
+ int j;
+
+ for (j = 0; j < l; j++)
+ printf("%02x%s", mac[j],
+ (j==l-1) ? "" : ":");
+}
+
+void print_mac_and_mask(const unsigned char *mac, const unsigned char *mask, int l)
+{
+ int i;
+
+ print_mac(mac, l);
+ for (i = 0; i < l ; i++)
+ if (mask[i] != 255)
+ break;
+ if (i == l)
+ return;
+ printf("/");
+ print_mac(mask, l);
+}
+
+/*********************************************/
+/* ARPTABLES SPECIFIC NEW FUNCTIONS END HERE */
+/*********************************************/
+
+struct in_addr *
+dotted_to_addr(const char *dotted)
+{
+ static struct in_addr addr;
+ unsigned char *addrp;
+ char *p, *q;
+ unsigned int onebyte;
+ int i;
+ char buf[20];
+
+ /* copy dotted string, because we need to modify it */
+ strncpy(buf, dotted, sizeof(buf) - 1);
+ addrp = (unsigned char *) &(addr.s_addr);
+
+ p = buf;
+ for (i = 0; i < 3; i++) {
+ if ((q = strchr(p, '.')) == NULL)
+ return (struct in_addr *) NULL;
+
+ *q = '\0';
+ if (string_to_number(p, 0, 255, &onebyte) == -1)
+ return (struct in_addr *) NULL;
+
+ addrp[i] = (unsigned char) onebyte;
+ p = q + 1;
+ }
+
+ /* we've checked 3 bytes, now we check the last one */
+ if (string_to_number(p, 0, 255, &onebyte) == -1)
+ return (struct in_addr *) NULL;
+
+ addrp[3] = (unsigned char) onebyte;
+
+ return &addr;
+}
+
+static struct in_addr *
+network_to_addr(const char *name)
+{
+ struct netent *net;
+ static struct in_addr addr;
+
+ if ((net = getnetbyname(name)) != NULL) {
+ if (net->n_addrtype != AF_INET)
+ return (struct in_addr *) NULL;
+ addr.s_addr = htonl((unsigned long) net->n_net);
+ return &addr;
+ }
+
+ return (struct in_addr *) NULL;
+}
+
+static void
+inaddrcpy(struct in_addr *dst, struct in_addr *src)
+{
+ /* memcpy(dst, src, sizeof(struct in_addr)); */
+ dst->s_addr = src->s_addr;
+}
+
+void
+exit_error(enum exittype status, char *msg, ...)
+{
+ va_list args;
+
+ va_start(args, msg);
+ fprintf(stderr, "%s v%s: ", program_name, program_version);
+ vfprintf(stderr, msg, args);
+ va_end(args);
+ fprintf(stderr, "\n");
+ if (status == PARAMETER_PROBLEM)
+ exit_tryhelp(status);
+ if (status == VERSION_PROBLEM)
+ fprintf(stderr,
+ "Perhaps arptables or your kernel needs to be upgraded.\n");
+ exit(status);
+}
+
+void
+exit_tryhelp(int status)
+{
+ fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
+ program_name, program_name );
+ exit(status);
+}
+
+void
+exit_printhelp(void)
+{
+ struct arptables_match *m = NULL;
+ struct arptables_target *t = NULL;
+ int i;
+
+ printf("%s v%s\n\n"
+"Usage: %s -[AD] chain rule-specification [options]\n"
+" %s -[RI] chain rulenum rule-specification [options]\n"
+" %s -D chain rulenum [options]\n"
+" %s -[LFZ] [chain] [options]\n"
+" %s -[NX] chain\n"
+" %s -E old-chain-name new-chain-name\n"
+" %s -P chain target [options]\n"
+" %s -h (print this help information)\n\n",
+ program_name, program_version, program_name, program_name,
+ program_name, program_name, program_name, program_name,
+ program_name, program_name);
+
+ printf(
+"Commands:\n"
+"Either long or short options are allowed.\n"
+" --append -A chain Append to chain\n"
+" --delete -D chain Delete matching rule from chain\n"
+" --delete -D chain rulenum\n"
+" Delete rule rulenum (1 = first) from chain\n"
+" --insert -I chain [rulenum]\n"
+" Insert in chain as rulenum (default 1=first)\n"
+" --replace -R chain rulenum\n"
+" Replace rule rulenum (1 = first) in chain\n"
+" --list -L [chain] List the rules in a chain or all chains\n"
+" --flush -F [chain] Delete all rules in chain or all chains\n"
+" --zero -Z [chain] Zero counters in chain or all chains\n"
+" --new -N chain Create a new user-defined chain\n"
+" --delete-chain\n"
+" -X [chain] Delete a user-defined chain\n"
+" --policy -P chain target\n"
+" Change policy on chain to target\n"
+" --rename-chain\n"
+" -E old-chain new-chain\n"
+" Change chain name, (moving any references)\n"
+
+"Options:\n"
+" --source-ip -s [!] address[/mask]\n"
+" source specification\n"
+" --destination-ip -d [!] address[/mask]\n"
+" destination specification\n"
+" --source-mac [!] address[/mask]\n"
+" --destination-mac [!] address[/mask]\n"
+" --h-length -l length[/mask] hardware length (nr of bytes)\n"
+" --opcode code[/mask] operation code (2 bytes)\n"
+" --h-type type[/mask] hardware type (2 bytes, hexadecimal)\n"
+" --proto-type type[/mask] protocol type (2 bytes)\n"
+" --in-interface -i [!] input name[+]\n"
+" network interface name ([+] for wildcard)\n"
+" --out-interface -o [!] output name[+]\n"
+" network interface name ([+] for wildcard)\n"
+" --jump -j target\n"
+" target for rule (may load target extension)\n"
+" --match -m match\n"
+" extended match (may load extension)\n"
+" --numeric -n numeric output of addresses and ports\n"
+" --table -t table table to manipulate (default: `filter')\n"
+" --verbose -v verbose mode\n"
+" --line-numbers print line numbers when listing\n"
+" --exact -x expand numbers (display exact values)\n"
+" --modprobe=<command> try to insert modules using this command\n"
+" --set-counters PKTS BYTES set the counter during insert/append\n"
+"[!] --version -V print package version.\n");
+ printf(" opcode strings: \n");
+ for (i = 0; i < NUMOPCODES; i++)
+ printf(" %d = %s\n", i + 1, opcodes[i]);
+ printf(
+" hardware type string: 1 = Ethernet\n"
+" protocol type string: 0x800 = IPv4\n");
+
+ /* Print out any special helps. A user might like to be able
+ to add a --help to the commandline, and see expected
+ results. So we call help for all matches & targets */
+ for (t=arptables_targets;t;t=t->next) {
+ printf("\n");
+ t->help();
+ }
+ for (m=arptables_matches;m;m=m->next) {
+ printf("\n");
+ m->help();
+ }
+ exit(0);
+}
+
+static void
+generic_opt_check(int command, int options)
+{
+ int i, j, legal = 0;
+
+ /* Check that commands are valid with options. Complicated by the
+ * fact that if an option is legal with *any* command given, it is
+ * legal overall (ie. -z and -l).
+ */
+ for (i = 0; i < NUMBER_OF_OPT; i++) {
+ legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */
+
+ for (j = 0; j < NUMBER_OF_CMD; j++) {
+ if (!(command & (1<<j)))
+ continue;
+
+ if (!(options & (1<<i))) {
+ if (commands_v_options[j][i] == '+')
+ exit_error(PARAMETER_PROBLEM,
+ "You need to supply the `-%c' "
+ "option for this command\n",
+ optflags[i]);
+ } else {
+ if (commands_v_options[j][i] != 'x')
+ legal = 1;
+ else if (legal == 0)
+ legal = -1;
+ }
+ }
+ if (legal == -1)
+ exit_error(PARAMETER_PROBLEM,
+ "Illegal option `-%c' with this command\n",
+ optflags[i]);
+ }
+}
+
+static char
+opt2char(int option)
+{
+ const char *ptr;
+ for (ptr = optflags; option > 1; option >>= 1, ptr++);
+
+ return *ptr;
+}
+
+static char
+cmd2char(int option)
+{
+ const char *ptr;
+ for (ptr = cmdflags; option > 1; option >>= 1, ptr++);
+
+ return *ptr;
+}
+
+static void
+add_command(int *cmd, const int newcmd, const int othercmds, int invert)
+{
+ if (invert)
+ exit_error(PARAMETER_PROBLEM, "unexpected ! flag");
+ if (*cmd & (~othercmds))
+ exit_error(PARAMETER_PROBLEM, "Can't use -%c with -%c\n",
+ cmd2char(newcmd), cmd2char(*cmd & (~othercmds)));
+ *cmd |= newcmd;
+}
+
+int
+check_inverse(const char option[], int *invert, int *optind, int argc)
+{
+ if (option && strcmp(option, "!") == 0) {
+ if (*invert)
+ exit_error(PARAMETER_PROBLEM,
+ "Multiple `!' flags not allowed");
+ *invert = TRUE;
+ if (optind) {
+ *optind = *optind+1;
+ if (argc && *optind > argc)
+ exit_error(PARAMETER_PROBLEM,
+ "no argument following `!'");
+ }
+
+ return TRUE;
+ }
+ return FALSE;
+}
+
+static void *
+fw_calloc(size_t count, size_t size)
+{
+ void *p;
+
+ if ((p = calloc(count, size)) == NULL) {
+ perror("arptables: calloc failed");
+ exit(1);
+ }
+ return p;
+}
+
+static void *
+fw_malloc(size_t size)
+{
+ void *p;
+
+ if ((p = malloc(size)) == NULL) {
+ perror("arptables: malloc failed");
+ exit(1);
+ }
+ return p;
+}
+
+static struct in_addr *
+host_to_addr(const char *name, unsigned int *naddr)
+{
+ struct hostent *host;
+ struct in_addr *addr;
+ unsigned int i;
+
+ *naddr = 0;
+ if ((host = gethostbyname(name)) != NULL) {
+ if (host->h_addrtype != AF_INET ||
+ host->h_length != sizeof(struct in_addr))
+ return (struct in_addr *) NULL;
+
+ while (host->h_addr_list[*naddr] != (char *) NULL)
+ (*naddr)++;
+ addr = fw_calloc(*naddr, sizeof(struct in_addr));
+ for (i = 0; i < *naddr; i++)
+ inaddrcpy(&(addr[i]),
+ (struct in_addr *) host->h_addr_list[i]);
+ return addr;
+ }
+
+ return (struct in_addr *) NULL;
+}
+
+static char *
+addr_to_host(const struct in_addr *addr)
+{
+ struct hostent *host;
+
+ if ((host = gethostbyaddr((char *) addr,
+ sizeof(struct in_addr), AF_INET)) != NULL)
+ return (char *) host->h_name;
+
+ return (char *) NULL;
+}
+
+/*
+ * All functions starting with "parse" should succeed, otherwise
+ * the program fails.
+ * Most routines return pointers to static data that may change
+ * between calls to the same or other routines with a few exceptions:
+ * "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask"
+ * return global static data.
+*/
+
+static struct in_addr *
+parse_hostnetwork(const char *name, unsigned int *naddrs)
+{
+ struct in_addr *addrp, *addrptmp;
+
+ if ((addrptmp = dotted_to_addr(name)) != NULL ||
+ (addrptmp = network_to_addr(name)) != NULL) {
+ addrp = fw_malloc(sizeof(struct in_addr));
+ inaddrcpy(addrp, addrptmp);
+ *naddrs = 1;
+ return addrp;
+ }
+ if ((addrp = host_to_addr(name, naddrs)) != NULL)
+ return addrp;
+
+ exit_error(PARAMETER_PROBLEM, "host/network `%s' not found", name);
+}
+
+static struct in_addr *
+parse_mask(char *mask)
+{
+ static struct in_addr maskaddr;
+ struct in_addr *addrp;
+ unsigned int bits;
+
+ if (mask == NULL) {
+ /* no mask at all defaults to 32 bits */
+ maskaddr.s_addr = 0xFFFFFFFF;
+ return &maskaddr;
+ }
+ if ((addrp = dotted_to_addr(mask)) != NULL)
+ /* dotted_to_addr already returns a network byte order addr */
+ return addrp;
+ if (string_to_number(mask, 0, 32, &bits) == -1)
+ exit_error(PARAMETER_PROBLEM,
+ "invalid mask `%s' specified", mask);
+ if (bits != 0) {
+ maskaddr.s_addr = htonl(0xFFFFFFFF << (32 - bits));
+ return &maskaddr;
+ }
+
+ maskaddr.s_addr = 0L;
+ return &maskaddr;
+}
+
+void
+parse_hostnetworkmask(const char *name, struct in_addr **addrpp,
+ struct in_addr *maskp, unsigned int *naddrs)
+{
+ struct in_addr *addrp;
+ char buf[256];
+ char *p;
+ int i, j, k, n;
+
+ strncpy(buf, name, sizeof(buf) - 1);
+ if ((p = strrchr(buf, '/')) != NULL) {
+ *p = '\0';
+ addrp = parse_mask(p + 1);
+ } else
+ addrp = parse_mask(NULL);
+ inaddrcpy(maskp, addrp);
+
+ /* if a null mask is given, the name is ignored, like in "any/0" */
+ if (maskp->s_addr == 0L)
+ strcpy(buf, "0.0.0.0");
+
+ addrp = *addrpp = parse_hostnetwork(buf, naddrs);
+ n = *naddrs;
+ for (i = 0, j = 0; i < n; i++) {
+ addrp[j++].s_addr &= maskp->s_addr;
+ for (k = 0; k < j - 1; k++) {
+ if (addrp[k].s_addr == addrp[j - 1].s_addr) {
+ (*naddrs)--;
+ j--;
+ break;
+ }
+ }
+ }
+}
+
+struct arptables_match *
+find_match(const char *name, enum arpt_tryload tryload)
+{
+ struct arptables_match *ptr;
+
+ for (ptr = arptables_matches; ptr; ptr = ptr->next) {
+ if (strcmp(name, ptr->name) == 0)
+ break;
+ }
+
+ if (ptr && !ptr->loaded) {
+ if (tryload != DONT_LOAD)
+ ptr->loaded = 1;
+ else
+ ptr = NULL;
+ }
+ if(!ptr && (tryload == LOAD_MUST_SUCCEED)) {
+ exit_error(PARAMETER_PROBLEM,
+ "Couldn't find match `%s'\n", name);
+ }
+
+ if (ptr)
+ ptr->used = 1;
+
+ return ptr;
+}
+
+static void
+parse_interface(const char *arg, char *vianame, unsigned char *mask)
+{
+ int vialen = strlen(arg);
+ unsigned int i;
+
+ memset(mask, 0, IFNAMSIZ);
+ memset(vianame, 0, IFNAMSIZ);
+
+ if (vialen + 1 > IFNAMSIZ)
+ exit_error(PARAMETER_PROBLEM,
+ "interface name `%s' must be shorter than IFNAMSIZ"
+ " (%i)", arg, IFNAMSIZ-1);
+
+ strcpy(vianame, arg);
+ if (vialen == 0)
+ memset(mask, 0, IFNAMSIZ);
+ else if (vianame[vialen - 1] == '+') {
+ memset(mask, 0xFF, vialen - 1);
+ memset(mask + vialen - 1, 0, IFNAMSIZ - vialen + 1);
+ /* Don't remove `+' here! -HW */
+ } else {
+ /* Include nul-terminator in match */
+ memset(mask, 0xFF, vialen + 1);
+ memset(mask + vialen + 1, 0, IFNAMSIZ - vialen - 1);
+ for (i = 0; vianame[i]; i++) {
+ if (!isalnum(vianame[i])
+ && vianame[i] != '_'
+ && vianame[i] != '.') {
+ printf("Warning: wierd character in interface"
+ " `%s' (No aliases, :, ! or *).\n",
+ vianame);
+ break;
+ }
+ }
+ }
+}
+
+/* Can't be zero. */
+static int
+parse_rulenumber(const char *rule)
+{
+ unsigned int rulenum;
+
+ if (string_to_number(rule, 1, INT_MAX, &rulenum) == -1)
+ exit_error(PARAMETER_PROBLEM,
+ "Invalid rule number `%s'", rule);
+
+ return rulenum;
+}
+
+static const char *
+parse_target(const char *targetname)
+{
+ const char *ptr;
+
+ if (strlen(targetname) < 1)
+ exit_error(PARAMETER_PROBLEM,
+ "Invalid target name (too short)");
+
+ if (strlen(targetname)+1 > sizeof(arpt_chainlabel))
+ exit_error(PARAMETER_PROBLEM,
+ "Invalid target name `%s' (%i chars max)",
+ targetname, sizeof(arpt_chainlabel)-1);
+
+ for (ptr = targetname; *ptr; ptr++)
+ if (isspace(*ptr))
+ exit_error(PARAMETER_PROBLEM,
+ "Invalid target name `%s'", targetname);
+ return targetname;
+}
+
+static char *
+addr_to_network(const struct in_addr *addr)
+{
+ struct netent *net;
+
+ if ((net = getnetbyaddr((long) ntohl(addr->s_addr), AF_INET)) != NULL)
+ return (char *) net->n_name;
+
+ return (char *) NULL;
+}
+
+char *
+addr_to_dotted(const struct in_addr *addrp)
+{
+ static char buf[20];
+ const unsigned char *bytep;
+
+ bytep = (const unsigned char *) &(addrp->s_addr);
+ sprintf(buf, "%d.%d.%d.%d", bytep[0], bytep[1], bytep[2], bytep[3]);
+ return buf;
+}
+
+char *
+addr_to_anyname(const struct in_addr *addr)
+{
+ char *name;
+
+ if ((name = addr_to_host(addr)) != NULL ||
+ (name = addr_to_network(addr)) != NULL)
+ return name;
+
+ return addr_to_dotted(addr);
+}
+
+char *
+mask_to_dotted(const struct in_addr *mask)
+{
+ int i;
+ static char buf[20];
+ u_int32_t maskaddr, bits;
+
+ maskaddr = ntohl(mask->s_addr);
+
+ if (maskaddr == 0xFFFFFFFFL)
+ /* we don't want to see "/32" */
+ return "";
+
+ i = 32;
+ bits = 0xFFFFFFFEL;
+ while (--i >= 0 && maskaddr != bits)
+ bits <<= 1;
+ if (i >= 0)
+ sprintf(buf, "/%d", i);
+ else
+ /* mask was not a decent combination of 1's and 0's */
+ sprintf(buf, "/%s", addr_to_dotted(mask));
+
+ return buf;
+}
+
+int
+string_to_number(const char *s, unsigned int min, unsigned int max,
+ unsigned int *ret)
+{
+ long number;
+ char *end;
+
+ /* Handle hex, octal, etc. */
+ errno = 0;
+ number = strtol(s, &end, 0);
+ if (*end == '\0' && end != s) {
+ /* we parsed a number, let's see if we want this */
+ if (errno != ERANGE && min <= number && number <= max) {
+ *ret = number;
+ return 0;
+ }
+ }
+ return -1;
+}
+
+static void
+set_option(unsigned int *options, unsigned int option, u_int16_t *invflg,
+ int invert)
+{
+ if (*options & option)
+ exit_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed",
+ opt2char(option));
+ *options |= option;
+
+ if (invert) {
+ unsigned int i;
+ for (i = 0; 1 << i != option; i++);
+
+ if (!inverse_for_options[i])
+ exit_error(PARAMETER_PROBLEM,
+ "cannot have ! before -%c",
+ opt2char(option));
+ *invflg |= inverse_for_options[i];
+ }
+}
+
+struct arptables_target *
+find_target(const char *name, enum arpt_tryload tryload)
+{
+ struct arptables_target *ptr;
+
+ /* Standard target? */
+ if (strcmp(name, "") == 0
+ || strcmp(name, ARPTC_LABEL_ACCEPT) == 0
+ || strcmp(name, ARPTC_LABEL_DROP) == 0
+ || strcmp(name, ARPTC_LABEL_QUEUE) == 0
+ || strcmp(name, ARPTC_LABEL_RETURN) == 0)
+ name = "standard";
+
+ for (ptr = arptables_targets; ptr; ptr = ptr->next) {
+ if (strcmp(name, ptr->name) == 0)
+ break;
+ }
+
+ if (ptr && !ptr->loaded) {
+ if (tryload != DONT_LOAD)
+ ptr->loaded = 1;
+ else
+ ptr = NULL;
+ }
+ if(!ptr && (tryload == LOAD_MUST_SUCCEED)) {
+ exit_error(PARAMETER_PROBLEM,
+ "Couldn't find target `%s'\n", name);
+ }
+
+ if (ptr)
+ ptr->used = 1;
+
+ return ptr;
+}
+
+static struct option *
+merge_options(struct option *oldopts, const struct option *newopts,
+ unsigned int *option_offset)
+{
+ unsigned int num_old, num_new, i;
+ struct option *merge;
+
+ for (num_old = 0; oldopts[num_old].name; num_old++);
+ for (num_new = 0; newopts[num_new].name; num_new++);
+
+ global_option_offset += OPTION_OFFSET;
+ *option_offset = global_option_offset;
+
+ merge = malloc(sizeof(struct option) * (num_new + num_old + 1));
+ memcpy(merge, oldopts, num_old * sizeof(struct option));
+ for (i = 0; i < num_new; i++) {
+ merge[num_old + i] = newopts[i];
+ merge[num_old + i].val += *option_offset;
+ }
+ memset(merge + num_old + num_new, 0, sizeof(struct option));
+
+ return merge;
+}
+
+void
+register_match(struct arptables_match *me)
+{
+ struct arptables_match **i;
+
+ if (strcmp(me->version, program_version) != 0) {
+ fprintf(stderr, "%s: match `%s' v%s (I'm v%s).\n",
+ program_name, me->name, me->version, program_version);
+ exit(1);
+ }
+
+ if (find_match(me->name, DONT_LOAD)) {
+ fprintf(stderr, "%s: match `%s' already registered.\n",
+ program_name, me->name);
+ exit(1);
+ }
+
+ if (me->size != ARPT_ALIGN(me->size)) {
+ fprintf(stderr, "%s: match `%s' has invalid size %u.\n",
+ program_name, me->name, me->size);
+ exit(1);
+ }
+
+ /* Append to list. */
+ for (i = &arptables_matches; *i; i = &(*i)->next);
+ me->next = NULL;
+ *i = me;
+
+ me->m = NULL;
+ me->mflags = 0;
+}
+
+void
+register_target(struct arptables_target *me)
+{
+ if (strcmp(me->version, program_version) != 0) {
+ fprintf(stderr, "%s: target `%s' v%s (I'm v%s).\n",
+ program_name, me->name, me->version, program_version);
+ exit(1);
+ }
+
+ if (find_target(me->name, DONT_LOAD)) {
+ fprintf(stderr, "%s: target `%s' already registered.\n",
+ program_name, me->name);
+ exit(1);
+ }
+
+ if (me->size != ARPT_ALIGN(me->size)) {
+ fprintf(stderr, "%s: target `%s' has invalid size %u.\n",
+ program_name, me->name, me->size);
+ exit(1);
+ }
+
+ /* Prepend to list. */
+ me->next = arptables_targets;
+ arptables_targets = me;
+ me->t = NULL;
+ me->tflags = 0;
+}
+
+static void
+print_num(u_int64_t number, unsigned int format)
+{
+ if (format & FMT_KILOMEGAGIGA) {
+ if (number > 99999) {
+ number = (number + 500) / 1000;
+ if (number > 9999) {
+ number = (number + 500) / 1000;
+ if (number > 9999) {
+ number = (number + 500) / 1000;
+ if (number > 9999) {
+ number = (number + 500) / 1000;
+ printf(FMT("%4lluT ","%lluT "), number);
+ }
+ else printf(FMT("%4lluG ","%lluG "), number);
+ }
+ else printf(FMT("%4lluM ","%lluM "), number);
+ } else
+ printf(FMT("%4lluK ","%lluK "), number);
+ } else
+ printf(FMT("%5llu ","%llu "), number);
+ } else
+ printf(FMT("%8llu ","%llu "), number);
+}
+
+
+static void
+print_header(unsigned int format, const char *chain, arptc_handle_t *handle)
+{
+ struct arpt_counters counters;
+ const char *pol = arptc_get_policy(chain, &counters, handle);
+ printf("Chain %s", chain);
+ if (pol) {
+ printf(" (policy %s", pol);
+ if (!(format & FMT_NOCOUNTS)) {
+ fputc(' ', stdout);
+ print_num(counters.pcnt, (format|FMT_NOTABLE));
+ fputs("packets, ", stdout);
+ print_num(counters.bcnt, (format|FMT_NOTABLE));
+ fputs("bytes", stdout);
+ }
+ printf(")\n");
+ } else {
+ unsigned int refs;
+ if (!arptc_get_references(&refs, chain, handle))
+ printf(" (ERROR obtaining refs)\n");
+ else
+ printf(" (%u references)\n", refs);
+ }
+
+/* I don't like this
+ if (format & FMT_LINENUMBERS)
+ printf(FMT("%-4s ", "%s "), "num");
+ if (!(format & FMT_NOCOUNTS)) {
+ if (format & FMT_KILOMEGAGIGA) {
+ printf(FMT("%5s ","%s "), "pkts");
+ printf(FMT("%5s ","%s "), "bytes");
+ } else {
+ printf(FMT("%8s ","%s "), "pkts");
+ printf(FMT("%10s ","%s "), "bytes");
+ }
+ }
+ if (!(format & FMT_NOTARGET))
+ printf(FMT("%-9s ","%s "), "target");
+ fputs(" prot ", stdout);
+ if (format & FMT_OPTIONS)
+ fputs("opt", stdout);
+ if (format & FMT_VIA) {
+ printf(FMT(" %-6s ","%s "), "in");
+ printf(FMT("%-6s ","%s "), "out");
+ }
+ printf(FMT(" %-19s ","%s "), "source");
+ printf(FMT(" %-19s "," %s "), "destination");
+ printf("\n");
+*/
+}
+
+/*
+static int
+print_match(const struct arpt_entry_match *m,
+ const struct arpt_arp *arp,
+ int numeric)
+{
+ struct arptables_match *match = find_match(m->u.user.name, TRY_LOAD);
+
+ if (match) {
+ if (match->print)
+ match->print(arp, m, numeric);
+ else
+ printf("%s ", match->name);
+ } else {
+ if (m->u.user.name[0])
+ printf("UNKNOWN match `%s' ", m->u.user.name);
+ }
+*/
+ /* Don't stop iterating. */
+/* return 0;
+}
+*/
+
+/* e is called `fw' here for hysterical raisins */
+static void
+print_firewall(const struct arpt_entry *fw,
+ const char *targname,
+ unsigned int num,
+ unsigned int format,
+ const arptc_handle_t handle)
+{
+ struct arptables_target *target = NULL;
+ const struct arpt_entry_target *t;
+ u_int8_t flags;
+ char buf[BUFSIZ];
+
+ if (!arptc_is_chain(targname, handle))
+ target = find_target(targname, TRY_LOAD);
+ else
+ target = find_target(ARPT_STANDARD_TARGET, LOAD_MUST_SUCCEED);
+
+ t = arpt_get_target((struct arpt_entry *)fw);
+ flags = fw->arp.flags;
+
+ if (format & FMT_LINENUMBERS)
+ printf("%u ", num+1);
+
+ if (!(format & FMT_NOTARGET) && targname[0] != '\0')
+ printf("-j %s ", targname);
+
+ if (format & FMT_VIA) {
+ char iface[IFNAMSIZ+2];
+
+ if (fw->arp.invflags & ARPT_INV_VIA_IN) {
+ iface[0] = '!';
+ iface[1] = '\0';
+ }
+ else iface[0] = '\0';
+
+ if (fw->arp.iniface[0] != '\0') {
+ strcat(iface, fw->arp.iniface);
+ }
+ else if (format & FMT_NUMERIC) strcat(iface, "*");
+ else strcat(iface, "any");
+ printf("-i %s ", iface);
+
+ if (fw->arp.invflags & ARPT_INV_VIA_OUT) {
+ iface[0] = '!';
+ iface[1] = '\0';
+ }
+ else iface[0] = '\0';
+
+ if (fw->arp.outiface[0] != '\0') {
+ strcat(iface, fw->arp.outiface);
+ }
+ else if (format & FMT_NUMERIC) strcat(iface, "*");
+ else strcat(iface, "any");
+ printf("-o %s ", iface);
+ }
+
+ if (fw->arp.smsk.s_addr != 0L) {
+ printf("%s", fw->arp.invflags & ARPT_INV_SRCIP
+ ? "! " : "");
+ if (format & FMT_NUMERIC)
+ sprintf(buf, "%s", addr_to_dotted(&(fw->arp.src)));
+ else
+ sprintf(buf, "%s", addr_to_anyname(&(fw->arp.src)));
+ strcat(buf, mask_to_dotted(&(fw->arp.smsk)));
+ printf("-s %s ", buf);
+ }
+
+ if (fw->arp.arhln != 0) {
+ int i;
+
+ for (i = 0; i < fw->arp.arhln ; i++)
+ if (fw->arp.src_devaddr.mask[i] != 0)
+ break;
+ if (i == fw->arp.arhln)
+ goto after_devsrc;
+ printf("%s", fw->arp.invflags & ARPT_INV_SRCDEVADDR
+ ? "! " : "");
+ printf("--src-mac ");
+ print_mac_and_mask(fw->arp.src_devaddr.addr, fw->arp.src_devaddr.mask, fw->arp.arhln);
+ printf(" ");
+ }
+after_devsrc:
+
+ if (fw->arp.tmsk.s_addr != 0L) {
+ printf("%s",fw->arp.invflags & ARPT_INV_TGTIP
+ ? "! " : "");
+ if (format & FMT_NUMERIC)
+ sprintf(buf, "%s", addr_to_dotted(&(fw->arp.tgt)));
+ else
+ sprintf(buf, "%s", addr_to_anyname(&(fw->arp.tgt)));
+ strcat(buf, mask_to_dotted(&(fw->arp.tmsk)));
+ printf("-d %s ", buf);
+ }
+
+ if (fw->arp.arhln != 0) {
+ int i;
+
+ for (i = 0; i < fw->arp.arhln ; i++)
+ if (fw->arp.tgt_devaddr.mask[i] != 0)
+ break;
+ if (i == fw->arp.arhln)
+ goto after_devdst;
+ printf("%s",fw->arp.invflags & ARPT_INV_TGTDEVADDR
+ ? "! " : "");
+ printf("--dst-mac ");
+ print_mac_and_mask(fw->arp.tgt_devaddr.addr, fw->arp.tgt_devaddr.mask, fw->arp.arhln);
+ printf(" ");
+ }
+after_devdst:
+
+ if (fw->arp.arhln_mask != 0) {
+ printf("%s",fw->arp.invflags & ARPT_INV_ARPHLN
+ ? "! " : "");
+ printf("--h-length %d", fw->arp.arhln);
+ if (fw->arp.arhln_mask != 255)
+ printf("/%d", fw->arp.arhln_mask);
+ printf(" ");
+ }
+
+ if (fw->arp.arpop_mask != 0) {
+ int tmp = ntohs(fw->arp.arpop);
+
+ printf("%s",fw->arp.invflags & ARPT_INV_ARPOP
+ ? "! " : "");
+ if (tmp <= NUMOPCODES && !(format & FMT_NUMERIC))
+ printf("--opcode %s", opcodes[tmp-1]);
+ else
+ printf("--opcode %d", tmp);
+ if (fw->arp.arpop_mask != 65535)
+ printf("/%d", ntohs(fw->arp.arpop_mask));
+ printf(" ");
+ }
+
+ if (fw->arp.arhrd_mask != 0) {
+ uint16_t tmp = ntohs(fw->arp.arhrd);
+
+ printf("%s", fw->arp.invflags & ARPT_INV_ARPHRD
+ ? "! " : "");
+ if (tmp == 1 && !(format & FMT_NUMERIC))
+ printf("--h-type %s", "Ethernet");
+ else
+ printf("--h-type %u", tmp);
+ if (fw->arp.arhrd_mask != 65535)
+ printf("/%d", ntohs(fw->arp.arhrd_mask));
+ printf(" ");
+ }
+
+ if (fw->arp.arpro_mask != 0) {
+ int tmp = ntohs(fw->arp.arpro);
+
+ printf("%s", fw->arp.invflags & ARPT_INV_ARPPRO
+ ? "! " : "");
+ if (tmp == 0x0800 && !(format & FMT_NUMERIC))
+ printf("--proto-type %s", "IPv4");
+ else
+ printf("--proto-type 0x%x", tmp);
+ if (fw->arp.arpro_mask != 65535)
+ printf("/%x", ntohs(fw->arp.arpro_mask));
+ printf(" ");
+ }
+
+/* FIXME
+ ARPT_MATCH_ITERATE(fw, print_match, &fw->ip, format & FMT_NUMERIC);
+*/
+
+ if (target) {
+ if (target->print)
+ /* Print the target information. */
+ target->print(&fw->arp, t, format & FMT_NUMERIC);
+ } else if (t->u.target_size != sizeof(*t))
+ printf("[%u bytes of unknown target data] ",
+ t->u.target_size - sizeof(*t));
+
+ if (!(format & FMT_NOCOUNTS)) {
+ printf(", pcnt=");
+ print_num(fw->counters.pcnt, format);
+ printf("-- bcnt=");
+ print_num(fw->counters.bcnt, format);
+ }
+
+ if (!(format & FMT_NONEWLINE))
+ fputc('\n', stdout);
+}
+
+static void
+print_firewall_line(const struct arpt_entry *fw,
+ const arptc_handle_t h)
+{
+ struct arpt_entry_target *t;
+
+ t = arpt_get_target((struct arpt_entry *)fw);
+ print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h);
+}
+
+static int
+append_entry(const arpt_chainlabel chain,
+ struct arpt_entry *fw,
+ unsigned int nsaddrs,
+ const struct in_addr saddrs[],
+ unsigned int ndaddrs,
+ const struct in_addr daddrs[],
+ int verbose,
+ arptc_handle_t *handle)
+{
+ unsigned int i, j;
+ int ret = 1;
+
+ for (i = 0; i < nsaddrs; i++) {
+ fw->arp.src.s_addr = saddrs[i].s_addr;
+ for (j = 0; j < ndaddrs; j++) {
+ fw->arp.tgt.s_addr = daddrs[j].s_addr;
+ if (verbose)
+ print_firewall_line(fw, *handle);
+ ret &= arptc_append_entry(chain, fw, handle);
+ }
+ }
+
+ return ret;
+}
+
+static int
+replace_entry(const arpt_chainlabel chain,
+ struct arpt_entry *fw,
+ unsigned int rulenum,
+ const struct in_addr *saddr,
+ const struct in_addr *daddr,
+ int verbose,
+ arptc_handle_t *handle)
+{
+ fw->arp.src.s_addr = saddr->s_addr;
+ fw->arp.tgt.s_addr = daddr->s_addr;
+
+ if (verbose)
+ print_firewall_line(fw, *handle);
+ return arptc_replace_entry(chain, fw, rulenum, handle);
+}
+
+static int
+insert_entry(const arpt_chainlabel chain,
+ struct arpt_entry *fw,
+ unsigned int rulenum,
+ unsigned int nsaddrs,
+ const struct in_addr saddrs[],
+ unsigned int ndaddrs,
+ const struct in_addr daddrs[],
+ int verbose,
+ arptc_handle_t *handle)
+{
+ unsigned int i, j;
+ int ret = 1;
+
+ for (i = 0; i < nsaddrs; i++) {
+ fw->arp.src.s_addr = saddrs[i].s_addr;
+ for (j = 0; j < ndaddrs; j++) {
+ fw->arp.tgt.s_addr = daddrs[j].s_addr;
+ if (verbose)
+ print_firewall_line(fw, *handle);
+ ret &= arptc_insert_entry(chain, fw, rulenum, handle);
+ }
+ }
+
+ return ret;
+}
+
+static unsigned char *
+make_delete_mask(struct arpt_entry *fw)
+{
+ /* Establish mask for comparison */
+ unsigned int size;
+ struct arptables_match *m;
+ unsigned char *mask, *mptr;
+
+ size = sizeof(struct arpt_entry);
+ for (m = arptables_matches; m; m = m->next) {
+ if (!m->used)
+ continue;
+
+ size += ARPT_ALIGN(sizeof(struct arpt_entry_match)) + m->size;
+ }
+
+ mask = fw_calloc(1, size
+ + ARPT_ALIGN(sizeof(struct arpt_entry_target))
+ + arptables_targets->size);
+
+ memset(mask, 0xFF, sizeof(struct arpt_entry));
+ mptr = mask + sizeof(struct arpt_entry);
+
+ for (m = arptables_matches; m; m = m->next) {
+ if (!m->used)
+ continue;
+
+ memset(mptr, 0xFF,
+ ARPT_ALIGN(sizeof(struct arpt_entry_match))
+ + m->userspacesize);
+ mptr += ARPT_ALIGN(sizeof(struct arpt_entry_match)) + m->size;
+ }
+
+ memset(mptr, 0xFF,
+ ARPT_ALIGN(sizeof(struct arpt_entry_target))
+ + arptables_targets->userspacesize);
+
+ return mask;
+}
+
+static int
+delete_entry(const arpt_chainlabel chain,
+ struct arpt_entry *fw,
+ unsigned int nsaddrs,
+ const struct in_addr saddrs[],
+ unsigned int ndaddrs,
+ const struct in_addr daddrs[],
+ int verbose,
+ arptc_handle_t *handle)
+{
+ unsigned int i, j;
+ int ret = 1;
+ unsigned char *mask;
+
+ mask = make_delete_mask(fw);
+ for (i = 0; i < nsaddrs; i++) {
+ fw->arp.src.s_addr = saddrs[i].s_addr;
+ for (j = 0; j < ndaddrs; j++) {
+ fw->arp.tgt.s_addr = daddrs[j].s_addr;
+ if (verbose)
+ print_firewall_line(fw, *handle);
+ ret &= arptc_delete_entry(chain, fw, mask, handle);
+ }
+ }
+ return ret;
+}
+
+int
+for_each_chain(int (*fn)(const arpt_chainlabel, int, arptc_handle_t *),
+ int verbose, int builtinstoo, arptc_handle_t *handle)
+{
+ int ret = 1;
+ const char *chain;
+ char *chains;
+ unsigned int i, chaincount = 0;
+
+ chain = arptc_first_chain(handle);
+ while (chain) {
+ chaincount++;
+ chain = arptc_next_chain(handle);
+ }
+
+ chains = fw_malloc(sizeof(arpt_chainlabel) * chaincount);
+ i = 0;
+ chain = arptc_first_chain(handle);
+ while (chain) {
+ strcpy(chains + i*sizeof(arpt_chainlabel), chain);
+ i++;
+ chain = arptc_next_chain(handle);
+ }
+
+ for (i = 0; i < chaincount; i++) {
+ if (!builtinstoo
+ && arptc_builtin(chains + i*sizeof(arpt_chainlabel),
+ *handle))
+ continue;
+ ret &= fn(chains + i*sizeof(arpt_chainlabel), verbose, handle);
+ }
+
+ free(chains);
+ return ret;
+}
+
+int
+flush_entries(const arpt_chainlabel chain, int verbose,
+ arptc_handle_t *handle)
+{
+ if (!chain)
+ return for_each_chain(flush_entries, verbose, 1, handle);
+
+ if (verbose)
+ fprintf(stdout, "Flushing chain `%s'\n", chain);
+ return arptc_flush_entries(chain, handle);
+}
+
+static int
+zero_entries(const arpt_chainlabel chain, int verbose,
+ arptc_handle_t *handle)
+{
+ if (!chain)
+ return for_each_chain(zero_entries, verbose, 1, handle);
+
+ if (verbose)
+ fprintf(stdout, "Zeroing chain `%s'\n", chain);
+ return arptc_zero_entries(chain, handle);
+}
+
+int
+delete_chain(const arpt_chainlabel chain, int verbose,
+ arptc_handle_t *handle)
+{
+ if (!chain)
+ return for_each_chain(delete_chain, verbose, 0, handle);
+
+ if (verbose)
+ fprintf(stdout, "Deleting chain `%s'\n", chain);
+ return arptc_delete_chain(chain, handle);
+}
+
+static int
+list_entries(const arpt_chainlabel chain, int verbose, int numeric,
+ int expanded, int linenumbers, arptc_handle_t *handle)
+{
+ int found = 0;
+ unsigned int format;
+ const char *this;
+
+ format = FMT_OPTIONS;
+ if (!verbose)
+ format |= FMT_NOCOUNTS;
+ else
+ format |= FMT_VIA;
+
+ if (numeric)
+ format |= FMT_NUMERIC;
+
+ if (!expanded)
+ format |= FMT_KILOMEGAGIGA;
+
+ if (linenumbers)
+ format |= FMT_LINENUMBERS;
+
+ for (this = arptc_first_chain(handle);
+ this;
+ this = arptc_next_chain(handle)) {
+ const struct arpt_entry *i;
+ unsigned int num;
+
+ if (chain && strcmp(chain, this) != 0)
+ continue;
+
+ if (found) printf("\n");
+
+ print_header(format, this, handle);
+ i = arptc_first_rule(this, handle);
+
+ num = 0;
+ while (i) {
+ print_firewall(i,
+ arptc_get_target(i, handle),
+ num++,
+ format,
+ *handle);
+ i = arptc_next_rule(i, handle);
+ }
+ found = 1;
+ }
+
+ errno = ENOENT;
+ return found;
+}
+
+static char *get_modprobe(void)
+{
+ int procfile;
+ char *ret;
+
+ procfile = open(PROC_SYS_MODPROBE, O_RDONLY);
+ if (procfile < 0)
+ return NULL;
+
+ ret = malloc(1024);
+ if (ret) {
+ switch (read(procfile, ret, 1024)) {
+ case -1: goto fail;
+ case 1024: goto fail; /* Partial read. Wierd */
+ }
+ if (ret[strlen(ret)-1]=='\n')
+ ret[strlen(ret)-1]=0;
+ close(procfile);
+ return ret;
+ }
+ fail:
+ free(ret);
+ close(procfile);
+ return NULL;
+}
+
+int arptables_insmod(const char *modname, const char *modprobe)
+{
+ char *buf = NULL;
+ char *argv[3];
+
+ /* If they don't explicitly set it, read out of kernel */
+ if (!modprobe) {
+ buf = get_modprobe();
+ if (!buf)
+ return -1;
+ modprobe = buf;
+ }
+
+ switch (fork()) {
+ case 0:
+ argv[0] = (char *)modprobe;
+ argv[1] = (char *)modname;
+ argv[2] = NULL;
+ execv(argv[0], argv);
+
+ /* not usually reached */
+ exit(0);
+ case -1:
+ return -1;
+
+ default: /* parent */
+ wait(NULL);
+ }
+
+ free(buf);
+ return 0;
+}
+
+static struct arpt_entry *
+generate_entry(const struct arpt_entry *fw,
+ struct arptables_match *matches,
+ struct arpt_entry_target *target)
+{
+ unsigned int size;
+ /*
+ struct arptables_match *m;
+ */
+ struct arpt_entry *e;
+
+ size = sizeof(struct arpt_entry);
+ /* FIXME
+ for (m = matches; m; m = m->next) {
+ if (!m->used)
+ continue;
+
+ size += m->m->u.match_size;
+ }
+ */
+
+ e = fw_malloc(size + target->u.target_size);
+ *e = *fw;
+ e->target_offset = size;
+ e->next_offset = size + target->u.target_size;
+
+ size = 0;
+ /* FIXME
+ for (m = matches; m; m = m->next) {
+ if (!m->used)
+ continue;
+
+ memcpy(e->elems + size, m->m, m->m->u.match_size);
+ size += m->m->u.match_size;
+ }
+ */
+
+ memcpy(e->elems + size, target, target->u.target_size);
+
+ return e;
+}
+
+int do_command(int argc, char *argv[], char **table, arptc_handle_t *handle)
+{
+ struct arpt_entry fw, *e = NULL;
+ int invert = 0;
+ unsigned int nsaddrs = 0, ndaddrs = 0;
+ struct in_addr *saddrs = NULL, *daddrs = NULL;
+
+ int c, verbose = 0;
+ const char *chain = NULL;
+ const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL;
+ const char *policy = NULL, *newname = NULL;
+ unsigned int rulenum = 0, options = 0, command = 0;
+ const char *pcnt = NULL, *bcnt = NULL;
+ int ret = 1;
+/* struct arptables_match *m;*/
+ struct arptables_target *target = NULL;
+ struct arptables_target *t;
+ const char *jumpto = "";
+ char *protocol = NULL;
+ const char *modprobe = NULL;
+
+ memset(&fw, 0, sizeof(fw));
+
+ opts = original_opts;
+ global_option_offset = 0;
+
+ /* re-set optind to 0 in case do_command gets called
+ * a second time */
+ optind = 0;
+
+ /* clear mflags in case do_command gets called a second time
+ * (we clear the global list of all matches for security)*/
+/* for (m = arptables_matches; m; m = m->next) {
+ m->mflags = 0;
+ m->used = 0;
+ }*/
+
+ for (t = arptables_targets; t; t = t->next) {
+ t->tflags = 0;
+ t->used = 0;
+ }
+
+ /* Suppress error messages: we may add new options if we
+ demand-load a protocol. */
+ opterr = 0;
+
+ while ((c = getopt_long(argc, argv,
+ "-A:D:R:I:L::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:l:i:vnt:m:c:",
+ opts, NULL)) != -1) {
+ switch (c) {
+ /*
+ * Command selection
+ */
+ case 'A':
+ add_command(&command, CMD_APPEND, CMD_NONE,
+ invert);
+ chain = optarg;
+ break;
+
+ case 'D':
+ add_command(&command, CMD_DELETE, CMD_NONE,
+ invert);
+ chain = optarg;
+ if (optind < argc && argv[optind][0] != '-'
+ && argv[optind][0] != '!') {
+ rulenum = parse_rulenumber(argv[optind++]);
+ command = CMD_DELETE_NUM;
+ }
+ break;
+
+ case 'R':
+ add_command(&command, CMD_REPLACE, CMD_NONE,
+ invert);
+ chain = optarg;
+ if (optind < argc && argv[optind][0] != '-'
+ && argv[optind][0] != '!')
+ rulenum = parse_rulenumber(argv[optind++]);
+ else
+ exit_error(PARAMETER_PROBLEM,
+ "-%c requires a rule number",
+ cmd2char(CMD_REPLACE));
+ break;
+
+ case 'I':
+ add_command(&command, CMD_INSERT, CMD_NONE,
+ invert);
+ chain = optarg;
+ if (optind < argc && argv[optind][0] != '-'
+ && argv[optind][0] != '!')
+ rulenum = parse_rulenumber(argv[optind++]);
+ else rulenum = 1;
+ break;
+
+ case 'L':
+ add_command(&command, CMD_LIST, CMD_ZERO,
+ invert);
+ if (optarg) chain = optarg;
+ else if (optind < argc && argv[optind][0] != '-'
+ && argv[optind][0] != '!')
+ chain = argv[optind++];
+ break;
+
+ case 'F':
+ add_command(&command, CMD_FLUSH, CMD_NONE,
+ invert);
+ if (optarg) chain = optarg;
+ else if (optind < argc && argv[optind][0] != '-'
+ && argv[optind][0] != '!')
+ chain = argv[optind++];
+ break;
+
+ case 'Z':
+ add_command(&command, CMD_ZERO, CMD_LIST,
+ invert);
+ if (optarg) chain = optarg;
+ else if (optind < argc && argv[optind][0] != '-'
+ && argv[optind][0] != '!')
+ chain = argv[optind++];
+ break;
+
+ case 'N':
+ if (optarg && *optarg == '-')
+ exit_error(PARAMETER_PROBLEM,
+ "chain name not allowed to start "
+ "with `-'\n");
+ if (find_target(optarg, TRY_LOAD))
+ exit_error(PARAMETER_PROBLEM,
+ "chain name may not clash "
+ "with target name\n");
+ add_command(&command, CMD_NEW_CHAIN, CMD_NONE,
+ invert);
+ chain = optarg;
+ break;
+
+ case 'X':
+ add_command(&command, CMD_DELETE_CHAIN, CMD_NONE,
+ invert);
+ if (optarg) chain = optarg;
+ else if (optind < argc && argv[optind][0] != '-'
+ && argv[optind][0] != '!')
+ chain = argv[optind++];
+ break;
+
+ case 'E':
+ add_command(&command, CMD_RENAME_CHAIN, CMD_NONE,
+ invert);
+ chain = optarg;
+ if (optind < argc && argv[optind][0] != '-'
+ && argv[optind][0] != '!')
+ newname = argv[optind++];
+ else
+ exit_error(PARAMETER_PROBLEM,
+ "-%c requires old-chain-name and "
+ "new-chain-name",
+ cmd2char(CMD_RENAME_CHAIN));
+ break;
+
+ case 'P':
+ add_command(&command, CMD_SET_POLICY, CMD_NONE,
+ invert);
+ chain = optarg;
+ if (optind < argc && argv[optind][0] != '-'
+ && argv[optind][0] != '!')
+ policy = argv[optind++];
+ else
+ exit_error(PARAMETER_PROBLEM,
+ "-%c requires a chain and a policy",
+ cmd2char(CMD_SET_POLICY));
+ break;
+
+ case 'h':
+ if (!optarg)
+ optarg = argv[optind];
+
+ /* arptables -p icmp -h */
+ if (!arptables_matches && protocol)
+ find_match(protocol, TRY_LOAD);
+
+ exit_printhelp();
+
+ case 's':
+ check_inverse(optarg, &invert, &optind, argc);
+ set_option(&options, OPT_S_IP, &fw.arp.invflags,
+ invert);
+ shostnetworkmask = argv[optind-1];
+ break;
+
+ case 'd':
+ check_inverse(optarg, &invert, &optind, argc);
+ set_option(&options, OPT_D_IP, &fw.arp.invflags,
+ invert);
+ dhostnetworkmask = argv[optind-1];
+ break;
+
+ case 2:/* src-mac */
+ check_inverse(optarg, &invert, &optind, argc);
+ set_option(&options, OPT_S_MAC, &fw.arp.invflags,
+ invert);
+ if (getmac_and_mask(argv[optind - 1],
+ fw.arp.src_devaddr.addr, fw.arp.src_devaddr.mask))
+ exit_error(PARAMETER_PROBLEM, "Problem with specified "
+ "source mac");
+ fw.arp.arhln = 6;
+ break;
+
+ case 3:/* dst-mac */
+ check_inverse(optarg, &invert, &optind, argc);
+ set_option(&options, OPT_D_MAC, &fw.arp.invflags,
+ invert);
+
+ if (getmac_and_mask(argv[optind - 1],
+ fw.arp.tgt_devaddr.addr, fw.arp.tgt_devaddr.mask))
+ exit_error(PARAMETER_PROBLEM, "Problem with specified "
+ "destination mac");
+ fw.arp.arhln = 6;
+ break;
+
+ case 'l':/* hardware length */
+ check_inverse(optarg, &invert, &optind, argc);
+ set_option(&options, OPT_H_LENGTH, &fw.arp.invflags,
+ invert);
+ getlength_and_mask(argv[optind - 1], &fw.arp.arhln, &fw.arp.arhln_mask);
+ break;
+
+ case 4:/* opcode */
+ check_inverse(optarg, &invert, &optind, argc);
+ set_option(&options, OPT_OPCODE, &fw.arp.invflags,
+ invert);
+ if (get16_and_mask(argv[optind - 1], &fw.arp.arpop, &fw.arp.arpop_mask, 10)) {
+ int i;
+
+ for (i = 0; i < NUMOPCODES; i++)
+ if (!strcasecmp(opcodes[i], optarg))
+ break;
+ if (i == NUMOPCODES)
+ exit_error(PARAMETER_PROBLEM, "Problem with specified opcode");
+ fw.arp.arpop = htons(i+1);
+ }
+ break;
+
+ case 5:/* h-type */
+ check_inverse(optarg, &invert, &optind, argc);
+ set_option(&options, OPT_H_TYPE, &fw.arp.invflags,
+ invert);
+ if (get16_and_mask(argv[optind - 1], &fw.arp.arhrd, &fw.arp.arhrd_mask, 16)) {
+ if (strcasecmp(argv[optind-1], "Ethernet"))
+ exit_error(PARAMETER_PROBLEM, "Problem with specified hardware type");
+ fw.arp.arhrd = htons(1);
+ }
+ break;
+
+ case 6:/* proto-type */
+ check_inverse(optarg, &invert, &optind, argc);
+ set_option(&options, OPT_P_TYPE, &fw.arp.invflags,
+ invert);
+ if (get16_and_mask(argv[optind - 1], &fw.arp.arpro, &fw.arp.arpro_mask, 10)) {
+ if (strcasecmp(argv[optind-1], "ipv4"))
+ exit_error(PARAMETER_PROBLEM, "Problem with specified protocol type");
+ fw.arp.arpro = htons(0x800);
+ }
+ break;
+
+ case 'j':
+ set_option(&options, OPT_JUMP, &fw.arp.invflags,
+ invert);
+ jumpto = parse_target(optarg);
+ /* TRY_LOAD (may be chain name) */
+ target = find_target(jumpto, TRY_LOAD);
+
+ if (target) {
+ size_t size;
+
+ size = ARPT_ALIGN(sizeof(struct arpt_entry_target))
+ + target->size;
+
+ target->t = fw_calloc(1, size);
+ target->t->u.target_size = size;
+ strcpy(target->t->u.user.name, jumpto);
+/*
+ target->init(target->t, &fw.nfcache);
+*/
+ target->init(target->t);
+
+ opts = merge_options(opts, target->extra_opts, &target->option_offset);
+ }
+ break;
+
+
+ case 'i':
+ check_inverse(optarg, &invert, &optind, argc);
+ set_option(&options, OPT_VIANAMEIN, &fw.arp.invflags,
+ invert);
+ parse_interface(argv[optind-1],
+ fw.arp.iniface,
+ fw.arp.iniface_mask);
+/* fw.nfcache |= NFC_IP_IF_IN; */
+ break;
+
+ case 'o':
+ check_inverse(optarg, &invert, &optind, argc);
+ set_option(&options, OPT_VIANAMEOUT, &fw.arp.invflags,
+ invert);
+ parse_interface(argv[optind-1],
+ fw.arp.outiface,
+ fw.arp.outiface_mask);
+ /* fw.nfcache |= NFC_IP_IF_OUT; */
+ break;
+
+ case 'v':
+ if (!verbose)
+ set_option(&options, OPT_VERBOSE,
+ &fw.arp.invflags, invert);
+ verbose++;
+ break;
+
+ case 'm': /*{
+ size_t size;
+
+ if (invert)
+ exit_error(PARAMETER_PROBLEM,
+ "unexpected ! flag before --match");
+
+ m = find_match(optarg, LOAD_MUST_SUCCEED);
+ size = ARPT_ALIGN(sizeof(struct arpt_entry_match))
+ + m->size;
+ m->m = fw_calloc(1, size);
+ m->m->u.match_size = size;
+ strcpy(m->m->u.user.name, m->name);
+ m->init(m->m, &fw.nfcache);
+ opts = merge_options(opts, m->extra_opts, &m->option_offset);
+ }*/
+ break;
+
+ case 'n':
+ set_option(&options, OPT_NUMERIC, &fw.arp.invflags,
+ invert);
+ break;
+
+ case 't':
+ if (invert)
+ exit_error(PARAMETER_PROBLEM,
+ "unexpected ! flag before --table");
+ *table = argv[optind-1];
+ break;
+
+ case 'V':
+ if (invert)
+ printf("Not %s ;-)\n", program_version);
+ else
+ printf("%s v%s\n",
+ program_name, program_version);
+ exit(0);
+
+ case '0':
+ set_option(&options, OPT_LINENUMBERS, &fw.arp.invflags,
+ invert);
+ break;
+
+ case 'M':
+ modprobe = optarg;
+ break;
+
+ case 'c':
+
+ set_option(&options, OPT_COUNTERS, &fw.arp.invflags,
+ invert);
+ pcnt = optarg;
+ if (optind < argc && argv[optind][0] != '-'
+ && argv[optind][0] != '!')
+ bcnt = argv[optind++];
+ else
+ exit_error(PARAMETER_PROBLEM,
+ "-%c requires packet and byte counter",
+ opt2char(OPT_COUNTERS));
+
+ if (sscanf(pcnt, "%llu", &fw.counters.pcnt) != 1)
+ exit_error(PARAMETER_PROBLEM,
+ "-%c packet counter not numeric",
+ opt2char(OPT_COUNTERS));
+
+ if (sscanf(bcnt, "%llu", &fw.counters.bcnt) != 1)
+ exit_error(PARAMETER_PROBLEM,
+ "-%c byte counter not numeric",
+ opt2char(OPT_COUNTERS));
+
+ break;
+
+
+ case 1: /* non option */
+ if (optarg[0] == '!' && optarg[1] == '\0') {
+ if (invert)
+ exit_error(PARAMETER_PROBLEM,
+ "multiple consecutive ! not"
+ " allowed");
+ invert = TRUE;
+ optarg[0] = '\0';
+ continue;
+ }
+ printf("Bad argument `%s'\n", optarg);
+ exit_tryhelp(2);
+
+ default:
+ /* FIXME: This scheme doesn't allow two of the same
+ matches --RR */
+ if (!target
+ || !(target->parse(c - target->option_offset,
+ argv, invert,
+ &target->tflags,
+ &fw, &target->t))) {
+/*
+ for (m = arptables_matches; m; m = m->next) {
+ if (!m->used)
+ continue;
+
+ if (m->parse(c - m->option_offset,
+ argv, invert,
+ &m->mflags,
+ &fw,
+ &fw.nfcache,
+ &m->m))
+ break;
+ }
+*/
+
+ /* If you listen carefully, you can
+ actually hear this code suck. */
+
+ /* some explanations (after four different bugs
+ * in 3 different releases): If we encountere a
+ * parameter, that has not been parsed yet,
+ * it's not an option of an explicitly loaded
+ * match or a target. However, we support
+ * implicit loading of the protocol match
+ * extension. '-p tcp' means 'l4 proto 6' and
+ * at the same time 'load tcp protocol match on
+ * demand if we specify --dport'.
+ *
+ * To make this work, we need to make sure:
+ * - the parameter has not been parsed by
+ * a match (m above)
+ * - a protocol has been specified
+ * - the protocol extension has not been
+ * loaded yet, or is loaded and unused
+ * [think of arptables-restore!]
+ * - the protocol extension can be successively
+ * loaded
+ */
+/*
+ if (m == NULL
+ && protocol
+ && (!find_proto(protocol, DONT_LOAD,
+ options&OPT_NUMERIC)
+ || (find_proto(protocol, DONT_LOAD,
+ options&OPT_NUMERIC)
+ && (proto_used == 0))
+ )
+ && (m = find_proto(protocol, TRY_LOAD,
+ options&OPT_NUMERIC))) {
+ Try loading protocol */
+/*
+ size_t size;
+
+ proto_used = 1;
+
+ size = ARPT_ALIGN(sizeof(struct arpt_entry_match))
+ + m->size;
+
+ m->m = fw_calloc(1, size);
+ m->m->u.match_size = size;
+ strcpy(m->m->u.user.name, m->name);
+ m->init(m->m, &fw.nfcache);
+
+ opts = merge_options(opts,
+ m->extra_opts, &m->option_offset);
+
+ optind--;
+ continue;
+ }
+ if (!m)
+ exit_error(PARAMETER_PROBLEM,
+ "Unknown arg `%s'",
+ argv[optind-1]);
+*/
+ }
+ }
+ invert = FALSE;
+ }
+/*
+ for (m = arptables_matches; m; m = m->next) {
+ if (!m->used)
+ continue;
+
+ m->final_check(m->mflags);
+ }
+*/
+
+ if (target)
+ target->final_check(target->tflags);
+
+ /* Fix me: must put inverse options checking here --MN */
+
+ if (optind < argc)
+ exit_error(PARAMETER_PROBLEM,
+ "unknown arguments found on commandline");
+ if (!command)
+ exit_error(PARAMETER_PROBLEM, "no command specified");
+ if (invert)
+ exit_error(PARAMETER_PROBLEM,
+ "nothing appropriate following !");
+
+ if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND)) {
+ if (!(options & OPT_D_IP))
+ dhostnetworkmask = "0.0.0.0/0";
+ if (!(options & OPT_S_IP))
+ shostnetworkmask = "0.0.0.0/0";
+ }
+
+ if (shostnetworkmask)
+ parse_hostnetworkmask(shostnetworkmask, &saddrs,
+ &(fw.arp.smsk), &nsaddrs);
+
+ if (dhostnetworkmask)
+ parse_hostnetworkmask(dhostnetworkmask, &daddrs,
+ &(fw.arp.tmsk), &ndaddrs);
+
+ if ((nsaddrs > 1 || ndaddrs > 1) &&
+ (fw.arp.invflags & (ARPT_INV_SRCIP | ARPT_INV_TGTIP)))
+ exit_error(PARAMETER_PROBLEM, "! not allowed with multiple"
+ " source or destination IP addresses");
+
+ if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1))
+ exit_error(PARAMETER_PROBLEM, "Replacement rule does not "
+ "specify a unique address");
+
+ generic_opt_check(command, options);
+
+ if (chain && strlen(chain) > ARPT_FUNCTION_MAXNAMELEN)
+ exit_error(PARAMETER_PROBLEM,
+ "chain name `%s' too long (must be under %i chars)",
+ chain, ARPT_FUNCTION_MAXNAMELEN);
+
+ /* only allocate handle if we weren't called with a handle */
+ if (!*handle)
+ *handle = arptc_init(*table);
+
+ if (!*handle) {
+ /* try to insmod the module if arptc_init failed */
+ arptables_insmod("arp_tables", modprobe);
+ *handle = arptc_init(*table);
+ }
+
+ if (!*handle)
+ exit_error(VERSION_PROBLEM,
+ "can't initialize arptables table `%s': %s",
+ *table, arptc_strerror(errno));
+
+ if (command == CMD_APPEND
+ || command == CMD_DELETE
+ || command == CMD_INSERT
+ || command == CMD_REPLACE) {
+ if (strcmp(chain, "PREROUTING") == 0
+ || strcmp(chain, "INPUT") == 0) {
+ /* -o not valid with incoming packets. */
+ if (options & OPT_VIANAMEOUT)
+ exit_error(PARAMETER_PROBLEM,
+ "Can't use -%c with %s\n",
+ opt2char(OPT_VIANAMEOUT),
+ chain);
+ }
+
+ if (strcmp(chain, "POSTROUTING") == 0
+ || strcmp(chain, "OUTPUT") == 0) {
+ /* -i not valid with outgoing packets */
+ if (options & OPT_VIANAMEIN)
+ exit_error(PARAMETER_PROBLEM,
+ "Can't use -%c with %s\n",
+ opt2char(OPT_VIANAMEIN),
+ chain);
+ }
+
+ if (target && arptc_is_chain(jumpto, *handle)) {
+ printf("Warning: using chain %s, not extension\n",
+ jumpto);
+
+ target = NULL;
+ }
+
+ /* If they didn't specify a target, or it's a chain
+ name, use standard. */
+ if (!target
+ && (strlen(jumpto) == 0
+ || arptc_is_chain(jumpto, *handle))) {
+ size_t size;
+
+ target = find_target(ARPT_STANDARD_TARGET,
+ LOAD_MUST_SUCCEED);
+
+ size = sizeof(struct arpt_entry_target)
+ + target->size;
+ target->t = fw_calloc(1, size);
+ target->t->u.target_size = size;
+ strcpy(target->t->u.user.name, jumpto);
+ target->init(target->t);
+ }
+
+ if (!target) {
+ /* it is no chain, and we can't load a plugin.
+ * We cannot know if the plugin is corrupt, non
+ * existant OR if the user just misspelled a
+ * chain. */
+ find_target(jumpto, LOAD_MUST_SUCCEED);
+ } else {
+ e = generate_entry(&fw, arptables_matches, target->t);
+ }
+ }
+
+ switch (command) {
+ case CMD_APPEND:
+ ret = append_entry(chain, e,
+ nsaddrs, saddrs, ndaddrs, daddrs,
+ options&OPT_VERBOSE,
+ handle);
+ break;
+ case CMD_DELETE:
+ ret = delete_entry(chain, e,
+ nsaddrs, saddrs, ndaddrs, daddrs,
+ options&OPT_VERBOSE,
+ handle);
+ break;
+ case CMD_DELETE_NUM:
+ ret = arptc_delete_num_entry(chain, rulenum - 1, handle);
+ break;
+ case CMD_REPLACE:
+ ret = replace_entry(chain, e, rulenum - 1,
+ saddrs, daddrs, options&OPT_VERBOSE,
+ handle);
+ break;
+ case CMD_INSERT:
+ ret = insert_entry(chain, e, rulenum - 1,
+ nsaddrs, saddrs, ndaddrs, daddrs,
+ options&OPT_VERBOSE,
+ handle);
+ break;
+ case CMD_LIST:
+ ret = list_entries(chain,
+ options&OPT_VERBOSE,
+ options&OPT_NUMERIC,
+ /*options&OPT_EXPANDED*/0,
+ options&OPT_LINENUMBERS,
+ handle);
+ break;
+ case CMD_FLUSH:
+ ret = flush_entries(chain, options&OPT_VERBOSE, handle);
+ break;
+ case CMD_ZERO:
+ ret = zero_entries(chain, options&OPT_VERBOSE, handle);
+ break;
+ case CMD_LIST|CMD_ZERO:
+ ret = list_entries(chain,
+ options&OPT_VERBOSE,
+ options&OPT_NUMERIC,
+ /*options&OPT_EXPANDED*/0,
+ options&OPT_LINENUMBERS,
+ handle);
+ if (ret)
+ ret = zero_entries(chain,
+ options&OPT_VERBOSE, handle);
+ break;
+ case CMD_NEW_CHAIN:
+ ret = arptc_create_chain(chain, handle);
+ break;
+ case CMD_DELETE_CHAIN:
+ ret = delete_chain(chain, options&OPT_VERBOSE, handle);
+ break;
+ case CMD_RENAME_CHAIN:
+ ret = arptc_rename_chain(chain, newname, handle);
+ break;
+ case CMD_SET_POLICY:
+ ret = arptc_set_policy(chain, policy, NULL, handle);
+ break;
+ default:
+ /* We should never reach this... */
+ exit_tryhelp(2);
+ }
+
+ if (verbose > 1)
+ dump_entries(*handle);
+
+ return ret;
+}
+