540 lines
13 KiB
C
540 lines
13 KiB
C
/*
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* Copyright (c) 2002-2003 Luigi Rizzo
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* Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp
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* Copyright (c) 1994 Ugen J.S.Antsilevich
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*
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* Idea and grammar partially left from:
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* Copyright (c) 1993 Daniel Boulet
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*
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* Redistribution and use in source forms, with and without modification,
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* are permitted provided that this entire comment appears intact.
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*
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* Redistribution in binary form may occur without any restrictions.
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* Obviously, it would be nice if you gave credit where credit is due
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* but requiring it would be too onerous.
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*
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* This software is provided ``AS IS'' without any warranties of any kind.
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*
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* Command line interface for IP firewall facility
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*
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* $FreeBSD$
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*/
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#include <sys/wait.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include "ipfw2.h"
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static void
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help(void)
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{
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fprintf(stderr,
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"ipfw syntax summary (but please do read the ipfw(8) manpage):\n\n"
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"\tipfw [-abcdefhnNqStTv] <command>\n\n"
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"where <command> is one of the following:\n\n"
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"add [num] [set N] [prob x] RULE-BODY\n"
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"{pipe|queue} N config PIPE-BODY\n"
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"[pipe|queue] {zero|delete|show} [N{,N}]\n"
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"nat N config {ip IPADDR|if IFNAME|log|deny_in|same_ports|unreg_only|reset|\n"
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" reverse|proxy_only|redirect_addr linkspec|\n"
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" redirect_port linkspec|redirect_proto linkspec}\n"
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"set [disable N... enable N...] | move [rule] X to Y | swap X Y | show\n"
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"set N {show|list|zero|resetlog|delete} [N{,N}] | flush\n"
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"table N {add ip[/bits] [value] | delete ip[/bits] | flush | list}\n"
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"table all {flush | list}\n"
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"\n"
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"RULE-BODY: check-state [PARAMS] | ACTION [PARAMS] ADDR [OPTION_LIST]\n"
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"ACTION: check-state | allow | count | deny | unreach{,6} CODE |\n"
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" skipto N | {divert|tee} PORT | forward ADDR |\n"
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" pipe N | queue N | nat N | setfib FIB | reass\n"
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"PARAMS: [log [logamount LOGLIMIT]] [altq QUEUE_NAME]\n"
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"ADDR: [ MAC dst src ether_type ] \n"
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" [ ip from IPADDR [ PORT ] to IPADDR [ PORTLIST ] ]\n"
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" [ ipv6|ip6 from IP6ADDR [ PORT ] to IP6ADDR [ PORTLIST ] ]\n"
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"IPADDR: [not] { any | me | ip/bits{x,y,z} | table(t[,v]) | IPLIST }\n"
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"IP6ADDR: [not] { any | me | me6 | ip6/bits | IP6LIST }\n"
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"IP6LIST: { ip6 | ip6/bits }[,IP6LIST]\n"
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"IPLIST: { ip | ip/bits | ip:mask }[,IPLIST]\n"
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"OPTION_LIST: OPTION [OPTION_LIST]\n"
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"OPTION: bridged | diverted | diverted-loopback | diverted-output |\n"
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" {dst-ip|src-ip} IPADDR | {dst-ip6|src-ip6|dst-ipv6|src-ipv6} IP6ADDR |\n"
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" {dst-port|src-port} LIST |\n"
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" estab | frag | {gid|uid} N | icmptypes LIST | in | out | ipid LIST |\n"
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" iplen LIST | ipoptions SPEC | ipprecedence | ipsec | iptos SPEC |\n"
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" ipttl LIST | ipversion VER | keep-state | layer2 | limit ... |\n"
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" icmp6types LIST | ext6hdr LIST | flow-id N[,N] | fib FIB |\n"
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" mac ... | mac-type LIST | proto LIST | {recv|xmit|via} {IF|IPADDR} |\n"
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" setup | {tcpack|tcpseq|tcpwin} NN | tcpflags SPEC | tcpoptions SPEC |\n"
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" tcpdatalen LIST | verrevpath | versrcreach | antispoof\n"
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);
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exit(0);
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}
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/*
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* Free a the (locally allocated) copy of command line arguments.
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*/
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static void
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free_args(int ac, char **av)
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{
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int i;
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for (i=0; i < ac; i++)
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free(av[i]);
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free(av);
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}
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/*
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* Called with the arguments, including program name because getopt
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* wants it to be present.
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* Returns 0 if successful, 1 if empty command, errx() in case of errors.
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*/
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static int
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ipfw_main(int oldac, char **oldav)
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{
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int ch, ac, save_ac;
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const char *errstr;
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char **av, **save_av;
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int do_acct = 0; /* Show packet/byte count */
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int try_next = 0; /* set if pipe cmd not found */
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#define WHITESP " \t\f\v\n\r"
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if (oldac < 2)
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return 1; /* need at least one argument */
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if (oldac == 2) {
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/*
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* If we are called with a single string, try to split it into
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* arguments for subsequent parsing.
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* But first, remove spaces after a ',', by copying the string
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* in-place.
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*/
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char *arg = oldav[1]; /* The string is the first arg. */
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int l = strlen(arg);
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int copy = 0; /* 1 if we need to copy, 0 otherwise */
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int i, j;
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for (i = j = 0; i < l; i++) {
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if (arg[i] == '#') /* comment marker */
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break;
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if (copy) {
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arg[j++] = arg[i];
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copy = !index("," WHITESP, arg[i]);
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} else {
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copy = !index(WHITESP, arg[i]);
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if (copy)
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arg[j++] = arg[i];
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}
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}
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if (!copy && j > 0) /* last char was a 'blank', remove it */
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j--;
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l = j; /* the new argument length */
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arg[j++] = '\0';
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if (l == 0) /* empty string! */
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return 1;
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/*
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* First, count number of arguments. Because of the previous
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* processing, this is just the number of blanks plus 1.
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*/
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for (i = 0, ac = 1; i < l; i++)
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if (index(WHITESP, arg[i]) != NULL)
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ac++;
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/*
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* Allocate the argument list, including one entry for
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* the program name because getopt expects it.
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*/
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av = safe_calloc(ac + 1, sizeof(char *));
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/*
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* Second, copy arguments from arg[] to av[]. For each one,
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* j is the initial character, i is the one past the end.
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*/
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for (ac = 1, i = j = 0; i < l; i++)
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if (index(WHITESP, arg[i]) != NULL || i == l-1) {
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if (i == l-1)
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i++;
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av[ac] = safe_calloc(i-j+1, 1);
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bcopy(arg+j, av[ac], i-j);
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ac++;
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j = i + 1;
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}
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} else {
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/*
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* If an argument ends with ',' join with the next one.
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*/
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int first, i, l;
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av = safe_calloc(oldac, sizeof(char *));
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for (first = i = ac = 1, l = 0; i < oldac; i++) {
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char *arg = oldav[i];
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int k = strlen(arg);
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l += k;
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if (arg[k-1] != ',' || i == oldac-1) {
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/* Time to copy. */
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av[ac] = safe_calloc(l+1, 1);
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for (l=0; first <= i; first++) {
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strcat(av[ac]+l, oldav[first]);
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l += strlen(oldav[first]);
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}
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ac++;
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l = 0;
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first = i+1;
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}
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}
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}
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av[0] = strdup(oldav[0]); /* copy progname from the caller */
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/* Set the force flag for non-interactive processes */
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if (!co.do_force)
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co.do_force = !isatty(STDIN_FILENO);
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/* Save arguments for final freeing of memory. */
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save_ac = ac;
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save_av = av;
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optind = optreset = 1; /* restart getopt() */
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while ((ch = getopt(ac, av, "abcdefhinNqs:STtv")) != -1)
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switch (ch) {
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case 'a':
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do_acct = 1;
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break;
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case 'b':
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co.comment_only = 1;
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co.do_compact = 1;
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break;
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case 'c':
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co.do_compact = 1;
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break;
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case 'd':
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co.do_dynamic = 1;
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break;
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case 'e':
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co.do_expired = 1;
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break;
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case 'f':
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co.do_force = 1;
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break;
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case 'h': /* help */
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free_args(save_ac, save_av);
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help();
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break; /* NOTREACHED */
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case 'i':
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co.do_value_as_ip = 1;
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break;
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case 'n':
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co.test_only = 1;
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break;
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case 'N':
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co.do_resolv = 1;
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break;
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case 'q':
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co.do_quiet = 1;
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break;
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case 's': /* sort */
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co.do_sort = atoi(optarg);
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break;
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case 'S':
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co.show_sets = 1;
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break;
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case 't':
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co.do_time = 1;
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break;
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case 'T':
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co.do_time = 2; /* numeric timestamp */
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break;
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case 'v': /* verbose */
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co.verbose = 1;
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break;
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default:
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free_args(save_ac, save_av);
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return 1;
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}
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ac -= optind;
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av += optind;
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NEED1("bad arguments, for usage summary ``ipfw''");
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/*
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* An undocumented behaviour of ipfw1 was to allow rule numbers first,
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* e.g. "100 add allow ..." instead of "add 100 allow ...".
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* In case, swap first and second argument to get the normal form.
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*/
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if (ac > 1 && isdigit(*av[0])) {
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char *p = av[0];
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av[0] = av[1];
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av[1] = p;
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}
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/*
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* Optional: pipe, queue or nat.
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*/
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co.do_nat = 0;
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co.do_pipe = 0;
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if (!strncmp(*av, "nat", strlen(*av)))
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co.do_nat = 1;
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else if (!strncmp(*av, "pipe", strlen(*av)))
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co.do_pipe = 1;
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else if (_substrcmp(*av, "queue") == 0)
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co.do_pipe = 2;
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else if (!strncmp(*av, "set", strlen(*av))) {
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if (ac > 1 && isdigit(av[1][0])) {
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co.use_set = strtonum(av[1], 0, resvd_set_number,
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&errstr);
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if (errstr)
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errx(EX_DATAERR,
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"invalid set number %s\n", av[1]);
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ac -= 2; av += 2; co.use_set++;
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}
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}
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if (co.do_pipe || co.do_nat) {
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ac--;
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av++;
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}
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NEED1("missing command");
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/*
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* For pipes, queues and nats we normally say 'nat|pipe NN config'
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* but the code is easier to parse as 'nat|pipe config NN'
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* so we swap the two arguments.
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*/
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if ((co.do_pipe || co.do_nat) && ac > 1 && isdigit(*av[0])) {
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char *p = av[0];
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av[0] = av[1];
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av[1] = p;
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}
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if (co.use_set == 0) {
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if (_substrcmp(*av, "add") == 0)
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ipfw_add(ac, av);
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else if (co.do_nat && _substrcmp(*av, "show") == 0)
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ipfw_show_nat(ac, av);
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else if (co.do_pipe && _substrcmp(*av, "config") == 0)
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ipfw_config_pipe(ac, av);
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else if (co.do_nat && _substrcmp(*av, "config") == 0)
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ipfw_config_nat(ac, av);
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else if (_substrcmp(*av, "set") == 0)
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ipfw_sets_handler(ac, av);
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else if (_substrcmp(*av, "table") == 0)
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ipfw_table_handler(ac, av);
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else if (_substrcmp(*av, "enable") == 0)
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ipfw_sysctl_handler(ac, av, 1);
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else if (_substrcmp(*av, "disable") == 0)
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ipfw_sysctl_handler(ac, av, 0);
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else
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try_next = 1;
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}
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if (co.use_set || try_next) {
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if (_substrcmp(*av, "delete") == 0)
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ipfw_delete(ac, av);
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else if (_substrcmp(*av, "flush") == 0)
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ipfw_flush(co.do_force);
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else if (_substrcmp(*av, "zero") == 0)
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ipfw_zero(ac, av, 0 /* IP_FW_ZERO */);
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else if (_substrcmp(*av, "resetlog") == 0)
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ipfw_zero(ac, av, 1 /* IP_FW_RESETLOG */);
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else if (_substrcmp(*av, "print") == 0 ||
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_substrcmp(*av, "list") == 0)
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ipfw_list(ac, av, do_acct);
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else if (_substrcmp(*av, "show") == 0)
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ipfw_list(ac, av, 1 /* show counters */);
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else
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errx(EX_USAGE, "bad command `%s'", *av);
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}
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/* Free memory allocated in the argument parsing. */
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free_args(save_ac, save_av);
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return 0;
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}
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static void
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ipfw_readfile(int ac, char *av[])
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{
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#define MAX_ARGS 32
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char buf[BUFSIZ];
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char *progname = av[0]; /* original program name */
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const char *cmd = NULL; /* preprocessor name, if any */
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const char *filename = av[ac-1]; /* file to read */
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int c, lineno=0;
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FILE *f = NULL;
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pid_t preproc = 0;
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while ((c = getopt(ac, av, "cfNnp:qS")) != -1) {
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switch(c) {
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case 'c':
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co.do_compact = 1;
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break;
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case 'f':
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co.do_force = 1;
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break;
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case 'N':
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co.do_resolv = 1;
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break;
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case 'n':
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co.test_only = 1;
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break;
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case 'p':
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/*
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* ipfw -p cmd [args] filename
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*
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* We are done with getopt(). All arguments
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* except the filename go to the preprocessor,
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* so we need to do the following:
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* - check that a filename is actually present;
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* - advance av by optind-1 to skip arguments
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* already processed;
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* - decrease ac by optind, to remove the args
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* already processed and the final filename;
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* - set the last entry in av[] to NULL so
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* popen() can detect the end of the array;
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* - set optind=ac to let getopt() terminate.
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*/
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if (optind == ac)
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errx(EX_USAGE, "no filename argument");
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cmd = optarg;
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av[ac-1] = NULL;
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av += optind - 1;
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ac -= optind;
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optind = ac;
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break;
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case 'q':
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co.do_quiet = 1;
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break;
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case 'S':
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co.show_sets = 1;
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break;
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default:
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errx(EX_USAGE, "bad arguments, for usage"
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" summary ``ipfw''");
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}
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}
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if (cmd == NULL && ac != optind + 1)
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errx(EX_USAGE, "extraneous filename arguments %s", av[ac-1]);
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if ((f = fopen(filename, "r")) == NULL)
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err(EX_UNAVAILABLE, "fopen: %s", filename);
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if (cmd != NULL) { /* pipe through preprocessor */
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int pipedes[2];
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if (pipe(pipedes) == -1)
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err(EX_OSERR, "cannot create pipe");
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preproc = fork();
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if (preproc == -1)
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err(EX_OSERR, "cannot fork");
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if (preproc == 0) {
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/*
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* Child, will run the preprocessor with the
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* file on stdin and the pipe on stdout.
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*/
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if (dup2(fileno(f), 0) == -1
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|| dup2(pipedes[1], 1) == -1)
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err(EX_OSERR, "dup2()");
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fclose(f);
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close(pipedes[1]);
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close(pipedes[0]);
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execvp(cmd, av);
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err(EX_OSERR, "execvp(%s) failed", cmd);
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} else { /* parent, will reopen f as the pipe */
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fclose(f);
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close(pipedes[1]);
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if ((f = fdopen(pipedes[0], "r")) == NULL) {
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int savederrno = errno;
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(void)kill(preproc, SIGTERM);
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errno = savederrno;
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err(EX_OSERR, "fdopen()");
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}
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}
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}
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while (fgets(buf, BUFSIZ, f)) { /* read commands */
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char linename[10];
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char *args[2];
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lineno++;
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sprintf(linename, "Line %d", lineno);
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setprogname(linename); /* XXX */
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args[0] = progname;
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args[1] = buf;
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ipfw_main(2, args);
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}
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fclose(f);
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if (cmd != NULL) {
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int status;
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if (waitpid(preproc, &status, 0) == -1)
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errx(EX_OSERR, "waitpid()");
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if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK)
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errx(EX_UNAVAILABLE,
|
|
"preprocessor exited with status %d",
|
|
WEXITSTATUS(status));
|
|
else if (WIFSIGNALED(status))
|
|
errx(EX_UNAVAILABLE,
|
|
"preprocessor exited with signal %d",
|
|
WTERMSIG(status));
|
|
}
|
|
}
|
|
|
|
int
|
|
main(int ac, char *av[])
|
|
{
|
|
/*
|
|
* If the last argument is an absolute pathname, interpret it
|
|
* as a file to be preprocessed.
|
|
*/
|
|
|
|
if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0)
|
|
ipfw_readfile(ac, av);
|
|
else {
|
|
if (ipfw_main(ac, av)) {
|
|
errx(EX_USAGE,
|
|
"usage: ipfw [options]\n"
|
|
"do \"ipfw -h\" or \"man ipfw\" for details");
|
|
}
|
|
}
|
|
return EX_OK;
|
|
}
|