reorganized tree after kernel merge
diff --git a/iptables.c b/iptables.c
new file mode 100644
index 0000000..e7110ea
--- /dev/null
+++ b/iptables.c
@@ -0,0 +1,1963 @@
+/* Code to take an iptables-style command line and do it. */
+
+/*
+ * Author: 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.
+ */
+
+#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 <iptables.h>
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#ifndef IPT_LIB_DIR
+#define IPT_LIB_DIR "/usr/local/lib/iptables"
+#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) : (tab))
+
+
+#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', 'C', 'E' };
+
+#define OPTION_OFFSET 256
+
+#define OPT_NONE 0x00000U
+#define OPT_NUMERIC 0x00001U
+#define OPT_SOURCE 0x00002U
+#define OPT_DESTINATION 0x00004U
+#define OPT_PROTOCOL 0x00008U
+#define OPT_JUMP 0x00010U
+#define OPT_VERBOSE 0x00020U
+#define OPT_EXPANDED 0x00040U
+#define OPT_VIANAMEIN 0x00080U
+#define OPT_VIANAMEOUT 0x00100U
+#define OPT_FRAGMENT 0x00200U
+#define OPT_LINENUMBERS 0x00400U
+#define NUMBER_OF_OPT 11
+static const char optflags[NUMBER_OF_OPT]
+= { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', 'f', '3'};
+
+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' },
+ { "check", 1, 0, 'C' },
+ { "new-chain", 1, 0, 'N' },
+ { "delete-chain", 2, 0, 'X' },
+ { "rename-chain", 2, 0, 'E' },
+ { "policy", 1, 0, 'P' },
+ { "source", 1, 0, 's' },
+ { "destination", 1, 0, 'd' },
+ { "src", 1, 0, 's' }, /* synonym */
+ { "dst", 1, 0, 'd' }, /* synonym */
+ { "proto", 1, 0, 'p' },
+ { "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' },
+ { "fragments", 0, 0, 'f' },
+ { "version", 0, 0, 'V' },
+ { "help", 2, 0, 'h' },
+ { "line-numbers", 0, 0, '0' },
+ { 0 }
+};
+
+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*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x'},
+/*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x'},
+/*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x'},
+/*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x'},
+/*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x'},
+/*LIST*/ {' ','x','x','x','x',' ',' ','x','x','x',' '},
+/*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
+/*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
+/*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
+/*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
+/*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x','x'},
+/*CHECK*/ {'x','+','+','+','x',' ','x','+','+',' ','x'},
+/*RENAME*/ {'x','x','x','x','x',' ','x','x','x','x','x'}
+};
+
+static int inverse_for_options[NUMBER_OF_OPT] =
+{
+/* -n */ 0,
+/* -s */ IPT_INV_SRCIP,
+/* -d */ IPT_INV_DSTIP,
+/* -p */ IPT_INV_PROTO,
+/* -j */ 0,
+/* -v */ 0,
+/* -x */ 0,
+/* -i */ IPT_INV_VIA_IN,
+/* -o */ IPT_INV_VIA_OUT,
+/* -f */ IPT_INV_FRAG,
+/*--line*/ 0
+};
+
+const char *program_version;
+const char *program_name;
+
+/* Keeping track of external matches and targets: linked lists, but
+ unless we're listing (-L), they have only 0 or 1 entry. */
+struct iptables_match *iptables_matches = NULL;
+struct iptables_target *iptables_targets = NULL;
+
+/* Extra debugging from libiptc */
+extern void dump_entries(const iptc_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;
+};
+
+static const struct pprot chain_protos[] = {
+ { "tcp", IPPROTO_TCP },
+ { "udp", IPPROTO_UDP },
+ { "icmp", IPPROTO_ICMP },
+ { "all", 0 },
+};
+
+static char *
+proto_to_name(u_int8_t proto)
+{
+ unsigned int i;
+
+ if (proto) {
+ struct protoent *pent = getprotobynumber(proto);
+ if (pent)
+ return pent->p_name;
+ }
+
+ for (i = 0; i < sizeof(chain_protos)/sizeof(struct pprot); i++)
+ if (chain_protos[i].num == proto)
+ return chain_protos[i].name;
+
+ return NULL;
+}
+
+struct in_addr *
+dotted_to_addr(const char *dotted)
+{
+ static struct in_addr addr;
+ unsigned char *addrp;
+ char *p, *q;
+ int onebyte, 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 ((onebyte = string_to_number(p, 0, 255)) == -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 ((onebyte = string_to_number(p, 0, 255)) == -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 iptables 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)
+{
+ printf("%s v%s\n\n"
+"Usage: %s -[ADC] 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"
+" --check -C chain Test this packet on chain\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"
+" --proto -p [!] proto protocol: by number or name, eg. `tcp'\n"
+" --source -s [!] address[/mask]\n"
+" source specification\n"
+" --destination -d [!] address[/mask]\n"
+" destination specification\n"
+" --in-interface -i [!] input name[+]\n"
+" network interface name ([+] for wildcard)\n"
+" --jump -j target\n"
+" target for rule\n"
+" --numeric -n numeric output of addresses and ports\n"
+" --out-interface -o [!] output name[+]\n"
+" network interface name ([+] for wildcard)\n"
+" --table -t table table to manipulate (default: `filter')\n"
+" --verbose -v verbose mode\n"
+" --exact -x expand numbers (display exact values)\n"
+"[!] --fragment -f match second or further fragments only\n"
+"[!] --version -V print package version.\n");
+
+ /* Print out any special helps. */
+ if (iptables_targets) {
+ printf("\n");
+ iptables_targets->help();
+ }
+ if (iptables_matches) {
+ printf("\n");
+ iptables_matches->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)
+{
+ if (option && strcmp(option, "!") == 0) {
+ if (*invert)
+ exit_error(PARAMETER_PROBLEM,
+ "Multiple `!' flags not allowed");
+
+ *invert = TRUE;
+ return TRUE;
+ }
+ return FALSE;
+}
+
+static void *
+fw_calloc(size_t count, size_t size)
+{
+ void *p;
+
+ if ((p = calloc(count, size)) == NULL) {
+ perror("iptables: calloc failed");
+ exit(1);
+ }
+ return p;
+}
+
+static void *
+fw_malloc(size_t size)
+{
+ void *p;
+
+ if ((p = malloc(size)) == NULL) {
+ perror("iptables: 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;
+ 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 ((bits = string_to_number(mask, 0, 32)) == -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;
+}
+
+static 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 iptables_match *
+find_match(const char *name, int tryload)
+{
+ struct iptables_match *ptr;
+
+ for (ptr = iptables_matches; ptr; ptr = ptr->next) {
+ if (strcmp(name, ptr->name) == 0)
+ break;
+ }
+
+ if (!ptr && tryload) {
+ char path[sizeof(IPT_LIB_DIR) + sizeof("/libipt_.so")
+ + strlen(name)];
+ sprintf(path, IPT_LIB_DIR "/libipt_%s.so", name);
+ dlopen(path, RTLD_NOW);
+ return find_match(name, 0);
+ }
+
+ return ptr;
+}
+
+static u_int16_t
+parse_protocol(const char *s)
+{
+ int proto = string_to_number(s, 0, 65535);
+
+ if (proto == -1) {
+ struct protoent *pent;
+
+ if ((pent = getprotobyname(s)))
+ proto = pent->p_proto;
+ else {
+ unsigned int i;
+ for (i = 0;
+ i < sizeof(chain_protos)/sizeof(struct pprot);
+ i++) {
+ if (strcmp(s, chain_protos[i].name) == 0) {
+ proto = chain_protos[i].num;
+ break;
+ }
+ }
+ if (i == sizeof(chain_protos)/sizeof(struct pprot))
+ exit_error(PARAMETER_PROBLEM,
+ "unknown protocol `%s' specified",
+ s);
+ }
+ }
+
+ return (u_int16_t)proto;
+}
+
+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);
+ /* Remove `+' */
+ vianame[vialen - 1] = '\0';
+ } 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])) {
+ printf("Warning: wierd character in interface"
+ " `%s' (No aliases, :, ! or *).\n",
+ vianame);
+ break;
+ }
+ }
+}
+
+/* Can't be zero. */
+static int
+parse_rulenumber(const char *rule)
+{
+ int rulenum = string_to_number(rule, 1, INT_MAX);
+
+ if (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(ipt_chainlabel))
+ exit_error(PARAMETER_PROBLEM,
+ "Invalid target name `%s' (%i chars max)",
+ targetname, sizeof(ipt_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;
+}
+static 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);
+}
+
+static 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, int min, int max)
+{
+ int number;
+ char *end;
+
+ /* Handle hex, octal, etc. */
+ number = (int)strtol(s, &end, 0);
+ if (*end == '\0' && end != s) {
+ /* we parsed a number, let's see if we want this */
+ if (min <= number && number <= max)
+ return number;
+ }
+ return -1;
+}
+
+static void
+set_option(unsigned int *options, unsigned int option, u_int8_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 iptables_target *
+find_target(const char *name, int tryload)
+{
+ struct iptables_target *ptr;
+
+ /* Standard target? */
+ if (strcmp(name, "") == 0
+ || strcmp(name, IPTC_LABEL_ACCEPT) == 0
+ || strcmp(name, IPTC_LABEL_DROP) == 0
+ || strcmp(name, IPTC_LABEL_QUEUE) == 0
+ || strcmp(name, IPTC_LABEL_RETURN) == 0)
+ name = "standard";
+
+ for (ptr = iptables_targets; ptr; ptr = ptr->next) {
+ if (strcmp(name, ptr->name) == 0)
+ break;
+ }
+
+ if (!ptr && tryload) {
+ char path[sizeof(IPT_LIB_DIR) + sizeof("/libipt_.so")
+ + strlen(name)];
+ sprintf(path, IPT_LIB_DIR "/libipt_%s.so", name);
+ dlopen(path, RTLD_NOW);
+ return find_target(name, 0);
+ }
+
+ return ptr;
+}
+
+static struct option *
+merge_options(struct option *oldopts, 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 iptables_match *me)
+{
+ 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, 0)) {
+ fprintf(stderr, "%s: match `%s' already registered.\n",
+ program_name, me->name);
+ exit(1);
+ }
+
+ /* Prepend to list. */
+ me->next = iptables_matches;
+ iptables_matches = me;
+ me->m = NULL;
+ me->mflags = 0;
+
+ opts = merge_options(opts, me->extra_opts, &me->option_offset);
+}
+
+void
+register_target(struct iptables_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, 0)) {
+ fprintf(stderr, "%s: target `%s' already registered.\n",
+ program_name, me->name);
+ exit(1);
+ }
+
+ /* Prepend to list. */
+ me->next = iptables_targets;
+ iptables_targets = me;
+ me->t = NULL;
+ me->tflags = 0;
+
+ opts = merge_options(opts, me->extra_opts, &me->option_offset);
+}
+
+static void
+print_header(unsigned int format, const char *chain, iptc_handle_t *handle)
+{
+ struct ipt_counters counters;
+ const char *pol = iptc_get_policy(chain, &counters, handle);
+ printf("Chain %s", chain);
+ if (pol) {
+ printf(" (policy %s", pol);
+ if (!(format & FMT_NOCOUNTS))
+ printf(" %llu packets, %llu bytes",
+ counters.pcnt, counters.bcnt);
+ printf(")\n");
+ } else {
+ unsigned int refs;
+ iptc_get_references(&refs, chain, handle);
+ printf(" (%u references)\n", refs);
+ }
+
+ 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 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;
+ 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 int
+print_match(const struct ipt_entry_match *m,
+ const struct ipt_ip *ip,
+ int numeric)
+{
+ struct iptables_match *match = find_match(m->u.name, 1);
+
+ if (match) {
+ if (match->print)
+ match->print(ip, m, numeric);
+ } else {
+ if (m->u.name[0])
+ printf("UNKNOWN match `%s' ", m->u.name);
+ }
+ /* Don't stop iterating. */
+ return 0;
+}
+
+/* e is called `fw' here for hysterical raisins */
+static void
+print_firewall(const struct ipt_entry *fw,
+ const char *targname,
+ unsigned int num,
+ unsigned int format,
+ const iptc_handle_t handle)
+{
+ struct iptables_target *target = NULL;
+ const struct ipt_entry_target *t;
+ u_int8_t flags;
+ char buf[BUFSIZ];
+
+ /* User creates a chain called "REJECT": this overrides the
+ `REJECT' target module. Keep feeding them rope until the
+ revolution... Bwahahahahah */
+ if (!iptc_is_chain(targname, handle))
+ target = find_target(targname, 1);
+ else
+ target = find_target(IPT_STANDARD_TARGET, 1);
+
+ t = ipt_get_target((struct ipt_entry *)fw);
+ flags = fw->ip.flags;
+
+ if (format & FMT_LINENUMBERS)
+ printf(FMT("%-4u ", "%u "), num+1);
+
+ if (!(format & FMT_NOCOUNTS)) {
+ print_num(fw->counters.pcnt, format);
+ print_num(fw->counters.bcnt, format);
+ }
+
+ if (!(format & FMT_NOTARGET))
+ printf(FMT("%-9s ", "%s "), targname);
+
+ fputc(fw->ip.invflags & IPT_INV_PROTO ? '!' : ' ', stdout);
+ {
+ char *pname = proto_to_name(fw->ip.proto);
+ if (pname)
+ printf(FMT("%-5s", "%s "), pname);
+ else
+ printf(FMT("%-5hu", "%hu "), fw->ip.proto);
+ }
+
+ if (format & FMT_OPTIONS) {
+ if (format & FMT_NOTABLE)
+ fputs("opt ", stdout);
+ fputc(fw->ip.invflags & IPT_INV_FRAG ? '!' : '-', stdout);
+ fputc(flags & IPT_F_FRAG ? 'f' : '-', stdout);
+ fputc(' ', stdout);
+ }
+
+ if (format & FMT_VIA) {
+ char iface[IFNAMSIZ+2];
+
+ if (fw->ip.invflags & IPT_INV_VIA_IN) {
+ iface[0] = '!';
+ iface[1] = '\0';
+ }
+ else iface[0] = '\0';
+
+ if (fw->ip.iniface[0] != '\0') {
+ strcat(iface, fw->ip.iniface);
+ /* If it doesn't compare the nul-term, it's a
+ wildcard. */
+ if (fw->ip.iniface_mask[strlen(fw->ip.iniface)] == 0)
+ strcat(iface, "+");
+ }
+ else if (format & FMT_NUMERIC) strcat(iface, "*");
+ else strcat(iface, "any");
+ printf(FMT(" %-6s ","in %s "), iface);
+
+ if (fw->ip.invflags & IPT_INV_VIA_OUT) {
+ iface[0] = '!';
+ iface[1] = '\0';
+ }
+ else iface[0] = '\0';
+
+ if (fw->ip.outiface[0] != '\0') {
+ strcat(iface, fw->ip.outiface);
+ /* If it doesn't compare the nul-term, it's a
+ wildcard. */
+ if (fw->ip.outiface_mask[strlen(fw->ip.outiface)] == 0)
+ strcat(iface, "+");
+ }
+ else if (format & FMT_NUMERIC) strcat(iface, "*");
+ else strcat(iface, "any");
+ printf(FMT("%-6s ","out %s "), iface);
+ }
+
+ fputc(fw->ip.invflags & IPT_INV_SRCIP ? '!' : ' ', stdout);
+ if (fw->ip.smsk.s_addr == 0L && !(format & FMT_NUMERIC))
+ printf(FMT("%-19s ","%s "), "anywhere");
+ else {
+ if (format & FMT_NUMERIC)
+ sprintf(buf, "%s", addr_to_dotted(&(fw->ip.src)));
+ else
+ sprintf(buf, "%s", addr_to_anyname(&(fw->ip.src)));
+ strcat(buf, mask_to_dotted(&(fw->ip.smsk)));
+ printf(FMT("%-19s ","%s "), buf);
+ }
+
+ fputc(fw->ip.invflags & IPT_INV_DSTIP ? '!' : ' ', stdout);
+ if (fw->ip.dmsk.s_addr == 0L && !(format & FMT_NUMERIC))
+ printf(FMT("%-19s","-> %s"), "anywhere");
+ else {
+ if (format & FMT_NUMERIC)
+ sprintf(buf, "%s", addr_to_dotted(&(fw->ip.dst)));
+ else
+ sprintf(buf, "%s", addr_to_anyname(&(fw->ip.dst)));
+ strcat(buf, mask_to_dotted(&(fw->ip.dmsk)));
+ printf(FMT("%-19s","-> %s"), buf);
+ }
+
+ if (format & FMT_NOTABLE)
+ fputs(" ", stdout);
+
+ IPT_MATCH_ITERATE(fw, print_match, &fw->ip, format & FMT_NUMERIC);
+
+ if (target) {
+ if (target->print)
+ /* Print the target information. */
+ target->print(&fw->ip, t, format & FMT_NUMERIC);
+ } else if (t->target_size != sizeof(*t))
+ printf("[%u bytes of unknown target data] ",
+ t->target_size - sizeof(*t));
+
+ if (!(format & FMT_NONEWLINE))
+ fputc('\n', stdout);
+}
+
+static void
+print_firewall_line(const struct ipt_entry *fw,
+ const iptc_handle_t h)
+{
+ struct ipt_entry_target *t;
+
+ t = ipt_get_target((struct ipt_entry *)fw);
+ print_firewall(fw, t->u.name, 0, FMT_PRINT_RULE, h);
+}
+
+static int
+append_entry(const ipt_chainlabel chain,
+ struct ipt_entry *fw,
+ unsigned int nsaddrs,
+ const struct in_addr saddrs[],
+ unsigned int ndaddrs,
+ const struct in_addr daddrs[],
+ int verbose,
+ iptc_handle_t *handle)
+{
+ unsigned int i, j;
+ int ret = 1;
+
+ for (i = 0; i < nsaddrs; i++) {
+ fw->ip.src.s_addr = saddrs[i].s_addr;
+ for (j = 0; j < ndaddrs; j++) {
+ fw->ip.dst.s_addr = daddrs[j].s_addr;
+ if (verbose)
+ print_firewall_line(fw, *handle);
+ ret &= iptc_append_entry(chain, fw, handle);
+ }
+ }
+
+ return ret;
+}
+
+static int
+replace_entry(const ipt_chainlabel chain,
+ struct ipt_entry *fw,
+ unsigned int rulenum,
+ const struct in_addr *saddr,
+ const struct in_addr *daddr,
+ int verbose,
+ iptc_handle_t *handle)
+{
+ fw->ip.src.s_addr = saddr->s_addr;
+ fw->ip.dst.s_addr = daddr->s_addr;
+
+ if (verbose)
+ print_firewall_line(fw, *handle);
+ return iptc_replace_entry(chain, fw, rulenum, handle);
+}
+
+static int
+insert_entry(const ipt_chainlabel chain,
+ struct ipt_entry *fw,
+ unsigned int rulenum,
+ unsigned int nsaddrs,
+ const struct in_addr saddrs[],
+ unsigned int ndaddrs,
+ const struct in_addr daddrs[],
+ int verbose,
+ iptc_handle_t *handle)
+{
+ unsigned int i, j;
+ int ret = 1;
+
+ for (i = 0; i < nsaddrs; i++) {
+ fw->ip.src.s_addr = saddrs[i].s_addr;
+ for (j = 0; j < ndaddrs; j++) {
+ fw->ip.dst.s_addr = daddrs[j].s_addr;
+ if (verbose)
+ print_firewall_line(fw, *handle);
+ ret &= iptc_insert_entry(chain, fw, rulenum, handle);
+ }
+ }
+
+ return ret;
+}
+
+static int
+delete_entry(const ipt_chainlabel chain,
+ struct ipt_entry *fw,
+ unsigned int nsaddrs,
+ const struct in_addr saddrs[],
+ unsigned int ndaddrs,
+ const struct in_addr daddrs[],
+ int verbose,
+ iptc_handle_t *handle)
+{
+ unsigned int i, j;
+ int ret = 1;
+
+ for (i = 0; i < nsaddrs; i++) {
+ fw->ip.src.s_addr = saddrs[i].s_addr;
+ for (j = 0; j < ndaddrs; j++) {
+ fw->ip.dst.s_addr = daddrs[j].s_addr;
+ if (verbose)
+ print_firewall_line(fw, *handle);
+ ret &= iptc_delete_entry(chain, fw, handle);
+ }
+ }
+ return ret;
+}
+
+static int
+check_packet(const ipt_chainlabel chain,
+ struct ipt_entry *fw,
+ unsigned int nsaddrs,
+ const struct in_addr saddrs[],
+ unsigned int ndaddrs,
+ const struct in_addr daddrs[],
+ int verbose,
+ iptc_handle_t *handle)
+{
+ int ret = 1;
+ unsigned int i, j;
+ const char *msg;
+
+ for (i = 0; i < nsaddrs; i++) {
+ fw->ip.src.s_addr = saddrs[i].s_addr;
+ for (j = 0; j < ndaddrs; j++) {
+ fw->ip.dst.s_addr = daddrs[j].s_addr;
+ if (verbose)
+ print_firewall_line(fw, *handle);
+ msg = iptc_check_packet(chain, fw, handle);
+ if (!msg) ret = 0;
+ else printf("%s\n", msg);
+ }
+ }
+
+ return ret;
+}
+
+static int
+for_each_chain(int (*fn)(const ipt_chainlabel, int, iptc_handle_t *),
+ int verbose, iptc_handle_t *handle)
+{
+ int ret = 1;
+ const char *chain = NULL;
+
+ while ((chain = iptc_next_chain(chain, handle))) {
+ ret &= fn(chain, verbose, handle);
+ }
+
+ return ret;
+}
+
+static int
+flush_entries(const ipt_chainlabel chain, int verbose,
+ iptc_handle_t *handle)
+{
+ if (!chain)
+ return for_each_chain(flush_entries, verbose, handle);
+
+ if (verbose)
+ fprintf(stdout, "Flushing chain `%s'\n", chain);
+ return iptc_flush_entries(chain, handle);
+ }
+
+static int
+zero_entries(const ipt_chainlabel chain, int verbose,
+ iptc_handle_t *handle)
+{
+ if (!chain)
+ return for_each_chain(zero_entries, verbose, handle);
+
+ if (verbose)
+ fprintf(stdout, "Zeroing chain `%s'\n", chain);
+ return iptc_zero_entries(chain, handle);
+}
+
+static int
+delete_chain(const ipt_chainlabel chain, int verbose,
+ iptc_handle_t *handle)
+{
+ if (!chain) {
+ const char *i, *last = NULL;
+ int ret = 1;
+
+ /* Iterate over built-ins */
+ for (i = iptc_next_chain(NULL, handle);
+ i && iptc_builtin(i, *handle);
+ i = iptc_next_chain(i, handle))
+ last = i;
+
+ /* No user-defined chains? */
+ if (!i)
+ return ret;
+
+ /* Be careful iterating: it isn't safe during delete. */
+ /* Re-iterate after each delete successful */
+ while ((i = iptc_next_chain(last, handle)) != NULL) {
+ /* Skip over builtins. */
+ if (!delete_chain(i, verbose, handle)) {
+ /* Delete failed; start next
+ iteration from here */
+ last = i;
+ ret = 0;
+ }
+ }
+ return ret;
+ }
+
+ if (verbose)
+ fprintf(stdout, "Deleting chain `%s'\n", chain);
+ return iptc_delete_chain(chain, handle);
+}
+
+static int
+list_entries(const ipt_chainlabel chain, int verbose, int numeric,
+ int expanded, int linenumbers, iptc_handle_t *handle)
+{
+ int found = 0;
+ unsigned int i, format;
+ const char *this = NULL;
+
+ 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;
+
+
+ while ((this = iptc_next_chain(this, handle)) != NULL) {
+ if (chain && strcmp(chain, this) != 0)
+ continue;
+
+ if (found) printf("\n");
+
+ print_header(format, this, handle);
+ for (i = 0; i < iptc_num_rules(this, handle); i++)
+ print_firewall(iptc_get_rule(this, i, handle),
+ iptc_get_target(this, i, handle),
+ i,
+ format,
+ *handle);
+ found = 1;
+ }
+
+ errno = ENOENT;
+ return found;
+}
+
+static struct ipt_entry *
+generate_entry(const struct ipt_entry *fw,
+ struct iptables_match *matches,
+ struct ipt_entry_target *target)
+{
+ unsigned int size;
+ struct iptables_match *m;
+ struct ipt_entry *e;
+
+ size = sizeof(struct ipt_entry);
+ for (m = matches; m; m = m->next)
+ size += m->m->match_size;
+
+ e = fw_malloc(size + target->target_size);
+ *e = *fw;
+ e->target_offset = size;
+ e->next_offset = size + target->target_size;
+
+ size = 0;
+ for (m = matches; m; m = m->next) {
+ memcpy(e->elems + size, m->m, m->m->match_size);
+ size += m->m->match_size;
+ }
+ memcpy(e->elems + size, target, target->target_size);
+
+ return e;
+}
+
+int do_command(int argc, char *argv[], char **table, iptc_handle_t *handle)
+{
+ struct ipt_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;
+ int ret = 1;
+ struct iptables_match *m;
+ struct iptables_target *target = NULL;
+ const char *jumpto = "";
+ char *protocol = NULL;
+
+ memset(&fw, 0, sizeof(fw));
+
+ /* Suppress error messages: we may add new options if we
+ demand-load a protocol. */
+ opterr = 0;
+
+ while ((c = getopt_long(argc, argv,
+ "-A:C:D:R:I:L::F::Z::N:X::E:P:Vh::o:p:s:d:j:i:fbvnt:m:x",
+ 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 'C':
+ add_command(&command, CMD_CHECK, CMD_NONE,
+ invert);
+ chain = optarg;
+ 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':
+ 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++];
+ 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];
+
+ exit_printhelp();
+
+ /*
+ * Option selection
+ */
+ case 'p':
+ if (check_inverse(optarg, &invert))
+ optind++;
+ set_option(&options, OPT_PROTOCOL, &fw.ip.invflags,
+ invert);
+
+ /* Canonicalize into lower case */
+ for (protocol = argv[optind-1]; *protocol; protocol++)
+ *protocol = tolower(*protocol);
+
+ protocol = argv[optind-1];
+ fw.ip.proto = parse_protocol(protocol);
+
+ if (fw.ip.proto == 0
+ && (fw.ip.invflags & IPT_INV_PROTO))
+ exit_error(PARAMETER_PROBLEM,
+ "rule would never match protocol");
+ fw.nfcache |= NFC_IP_PROTO;
+ break;
+
+ case 's':
+ if (check_inverse(optarg, &invert))
+ optind++;
+ set_option(&options, OPT_SOURCE, &fw.ip.invflags,
+ invert);
+ shostnetworkmask = argv[optind-1];
+ fw.nfcache |= NFC_IP_SRC;
+ break;
+
+ case 'd':
+ if (check_inverse(optarg, &invert))
+ optind++;
+ set_option(&options, OPT_DESTINATION, &fw.ip.invflags,
+ invert);
+ dhostnetworkmask = argv[optind-1];
+ fw.nfcache |= NFC_IP_DST;
+ break;
+
+ case 'j':
+ set_option(&options, OPT_JUMP, &fw.ip.invflags,
+ invert);
+ jumpto = parse_target(optarg);
+ target = find_target(jumpto, 1);
+
+ if (target) {
+ size_t size = sizeof(struct ipt_entry_target)
+ + IPT_ALIGN(target->size);
+
+ target->t = fw_calloc(size, 1);
+ target->t->target_size = size;
+ strcpy(target->t->u.name, jumpto);
+ target->init(target->t, &fw.nfcache);
+ }
+ break;
+
+
+ case 'i':
+ if (check_inverse(optarg, &invert))
+ optind++;
+ set_option(&options, OPT_VIANAMEIN, &fw.ip.invflags,
+ invert);
+ parse_interface(argv[optind-1],
+ fw.ip.iniface,
+ fw.ip.iniface_mask);
+ fw.nfcache |= NFC_IP_IF_IN;
+ break;
+
+ case 'o':
+ if (check_inverse(optarg, &invert))
+ optind++;
+ set_option(&options, OPT_VIANAMEOUT, &fw.ip.invflags,
+ invert);
+ parse_interface(argv[optind-1],
+ fw.ip.outiface,
+ fw.ip.outiface_mask);
+ fw.nfcache |= NFC_IP_IF_OUT;
+ break;
+
+ case 'f':
+ set_option(&options, OPT_FRAGMENT, &fw.ip.invflags,
+ invert);
+ fw.ip.flags |= IPT_F_FRAG;
+ fw.nfcache |= NFC_IP_FRAG;
+ break;
+
+ case 'v':
+ if (!verbose)
+ set_option(&options, OPT_VERBOSE,
+ &fw.ip.invflags, invert);
+ verbose++;
+ break;
+
+ case 'm':
+ if (invert)
+ exit_error(PARAMETER_PROBLEM,
+ "unexpected ! flag before --match");
+
+ m = find_match(optarg, 1);
+ if (!m)
+ exit_error(PARAMETER_PROBLEM,
+ "Couldn't load match `%s'", optarg);
+ else {
+ size_t size = sizeof(struct ipt_entry_match)
+ + IPT_ALIGN(m->size);
+ m->m = fw_calloc(size, 1);
+ m->m->match_size = size;
+ strcpy(m->m->u.name, optarg);
+ m->init(m->m, &fw.nfcache);
+ }
+ break;
+
+ case 'n':
+ set_option(&options, OPT_NUMERIC, &fw.ip.invflags,
+ invert);
+ break;
+
+ case 't':
+ if (invert)
+ exit_error(PARAMETER_PROBLEM,
+ "unexpected ! flag before --table");
+ *table = argv[optind-1];
+ break;
+
+ case 'x':
+ set_option(&options, OPT_EXPANDED, &fw.ip.invflags,
+ invert);
+ 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.ip.invflags,
+ invert);
+ 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;
+ }
+ 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 = iptables_matches; m; m = m->next) {
+ if (m->parse(c - m->option_offset,
+ argv, invert,
+ &m->mflags,
+ &fw,
+ &fw.nfcache,
+ &m->m))
+ break;
+ }
+
+ /* If you listen carefully, you can
+ acually hear this code suck. */
+ if (!iptables_matches
+ && protocol
+ && (m = find_match(protocol, 1))) {
+ /* Try loading protocol */
+ size_t size = sizeof(struct ipt_entry_match)
+ + IPT_ALIGN(m->size);
+
+ m->m = fw_calloc(size, 1);
+ m->m->match_size = size;
+ strcpy(m->m->u.name, protocol);
+ m->init(m->m, &fw.nfcache);
+
+ optind--;
+ continue;
+ }
+ if (!m)
+ exit_error(PARAMETER_PROBLEM,
+ "Unknown arg `%s'",
+ argv[optind-1]);
+ }
+ }
+ invert = FALSE;
+ }
+
+ for (m = iptables_matches; m; m = m->next)
+ 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_DESTINATION))
+ dhostnetworkmask = "0.0.0.0/0";
+ if (!(options & OPT_SOURCE))
+ shostnetworkmask = "0.0.0.0/0";
+ }
+
+ if (shostnetworkmask)
+ parse_hostnetworkmask(shostnetworkmask, &saddrs,
+ &(fw.ip.smsk), &nsaddrs);
+
+ if (dhostnetworkmask)
+ parse_hostnetworkmask(dhostnetworkmask, &daddrs,
+ &(fw.ip.dmsk), &ndaddrs);
+
+ if ((nsaddrs > 1 || ndaddrs > 1) &&
+ (fw.ip.invflags & (IPT_INV_SRCIP | IPT_INV_DSTIP)))
+ exit_error(PARAMETER_PROBLEM, "! not allowed with multiple"
+ " source or destination IP addresses");
+
+ if (command == CMD_CHECK && fw.ip.invflags != 0)
+ exit_error(PARAMETER_PROBLEM, "! not allowed with -%c",
+ cmd2char(CMD_CHECK));
+
+ 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) > IPT_FUNCTION_MAXNAMELEN)
+ exit_error(PARAMETER_PROBLEM,
+ "chain name `%s' too long (must be under %i chars)",
+ chain, IPT_FUNCTION_MAXNAMELEN);
+
+ *handle = iptc_init(*table);
+ if (!*handle)
+ exit_error(VERSION_PROBLEM,
+ "can't initialize iptables table `%s': %s",
+ *table, iptc_strerror(errno));
+
+ if (command == CMD_APPEND
+ || command == CMD_DELETE
+ || command == CMD_INSERT
+ || command == CMD_REPLACE) {
+ /* -o not valid with incoming packets. */
+ if (options & OPT_VIANAMEOUT)
+ if (strcmp(chain, "PREROUTING") == 0
+ || strcmp(chain, "INPUT") == 0) {
+ exit_error(PARAMETER_PROBLEM,
+ "Can't use -%c with %s\n",
+ opt2char(OPT_VIANAMEOUT),
+ chain);
+ }
+
+ /* -i not valid with outgoing packets */
+ if (options & OPT_VIANAMEIN)
+ if (strcmp(chain, "POSTROUTING") == 0
+ || strcmp(chain, "OUTPUT") == 0) {
+ exit_error(PARAMETER_PROBLEM,
+ "Can't use -%c with %s\n",
+ opt2char(OPT_VIANAMEIN),
+ chain);
+ }
+
+ if (target && iptc_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
+ || iptc_is_chain(jumpto, *handle))) {
+ size_t size;
+ target = find_target(IPT_STANDARD_TARGET, 1);
+
+ if (!target)
+ exit_error(OTHER_PROBLEM,
+ "Can't find standard target\n");
+
+ size = sizeof(struct ipt_entry_target)
+ + IPT_ALIGN(target->size);
+ target->t = fw_calloc(size, 1);
+ target->t->target_size = size;
+ strcpy(target->t->u.name, jumpto);
+ target->init(target->t, &fw.nfcache);
+ }
+
+ if (!target) {
+ struct ipt_entry_target unknown_target;
+
+ /* Don't know it. Must be extension with no
+ options? */
+ unknown_target.target_size = sizeof(unknown_target);
+ strcpy(unknown_target.u.name, jumpto);
+
+ e = generate_entry(&fw, iptables_matches,
+ &unknown_target);
+ } else {
+ e = generate_entry(&fw, iptables_matches, target->t);
+ }
+ }
+
+ switch (command) {
+ case CMD_APPEND:
+ ret = append_entry(chain, e,
+ nsaddrs, saddrs, ndaddrs, daddrs,
+ options&OPT_VERBOSE,
+ handle);
+ break;
+ case CMD_CHECK:
+ ret = check_packet(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 = iptc_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,
+ 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,
+ options&OPT_LINENUMBERS,
+ handle);
+ if (ret)
+ ret = zero_entries(chain,
+ options&OPT_VERBOSE, handle);
+ break;
+ case CMD_NEW_CHAIN:
+ ret = iptc_create_chain(chain, handle);
+ break;
+ case CMD_DELETE_CHAIN:
+ ret = delete_chain(chain, options&OPT_VERBOSE, handle);
+ break;
+ case CMD_RENAME_CHAIN:
+ ret = iptc_rename_chain(chain, newname, handle);
+ break;
+ case CMD_SET_POLICY:
+ ret = iptc_set_policy(chain, policy, handle);
+ break;
+ default:
+ /* We should never reach this... */
+ exit_tryhelp(2);
+ }
+
+ if (verbose > 1)
+ dump_entries(*handle);
+
+ return ret;
+}