435 lines
8.6 KiB
C
435 lines
8.6 KiB
C
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/*
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* (C)opyright 1993,1994,1995 by Darren Reed.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and due credit is given
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* to the original author and the contributors.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#if !defined(__SVR4) && !defined(__GNUC__)
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#include <strings.h>
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#endif
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#if !defined(__SVR4) && defined(__GNUC__)
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extern char *index();
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#endif
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/file.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stddef.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <net/if.h>
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#include <netinet/ip.h>
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#include "ip_fil.h"
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#include <netdb.h>
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#include <arpa/nameser.h>
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#include <resolv.h>
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#include "ipf.h"
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#if !defined(lint) && defined(LIBC_SCCS)
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static char sccsid[] = "@(#)ipf.c 1.23 6/5/96 (C) 1993-1995 Darren Reed";
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static char rcsid[] = "$Id: ipf.c,v 2.0.1.2 1997/02/04 14:37:46 darrenr Exp $";
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#endif
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#if SOLARIS
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void frsync(), blockunknown();
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#endif
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void zerostats();
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extern char *optarg;
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int opts = 0;
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static int fd = -1;
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static void procfile(), flushfilter(), set_state();
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static void packetlogon(), swapactive(), showstats();
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static char *getline();
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int main(argc,argv)
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int argc;
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char *argv[];
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{
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char c;
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while ((c = getopt(argc, argv, "AdDEf:F:Il:noprsUvyzZ")) != -1) {
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switch (c)
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{
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case 'E' :
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set_state(1);
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break;
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case 'D' :
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set_state(0);
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break;
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case 'A' :
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opts &= ~OPT_INACTIVE;
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break;
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case 'd' :
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opts |= OPT_DEBUG;
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break;
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case 'f' :
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procfile(argv[0], optarg);
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break;
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case 'F' :
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flushfilter(optarg);
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break;
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case 'I' :
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opts |= OPT_INACTIVE;
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break;
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case 'l' :
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packetlogon(optarg);
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break;
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case 'n' :
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opts |= OPT_DONOTHING;
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break;
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case 'o' :
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opts |= OPT_OUTQUE;
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break;
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case 'p' :
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opts |= OPT_PRINTFR;
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break;
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case 'r' :
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opts |= OPT_REMOVE;
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break;
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case 's' :
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swapactive();
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break;
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#if SOLARIS
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case 'U' :
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blockunknown();
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break;
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#endif
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case 'v' :
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opts |= OPT_VERBOSE;
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break;
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#if SOLARIS
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case 'y' :
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frsync();
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break;
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#endif
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case 'z' :
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opts |= OPT_ZERORULEST;
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break;
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case 'Z' :
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zerostats();
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break;
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}
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}
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if (fd != -1)
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(void) close(fd);
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exit(0);
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/* NOTREACHED */
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}
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static int opendevice()
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{
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if (opts & OPT_DONOTHING)
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return -2;
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if (!(opts & OPT_DONOTHING) && fd == -1)
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if ((fd = open(IPL_NAME, O_RDWR)) == -1)
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if ((fd = open(IPL_NAME, O_RDONLY)) == -1)
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perror("open device");
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return fd;
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}
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static void set_state(enable)
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u_int enable;
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{
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if (opendevice() != -2)
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if (ioctl(fd, SIOCFRENB, &enable) == -1)
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perror("SIOCFRENB");
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return;
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}
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static void procfile(name, file)
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char *name, *file;
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{
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FILE *fp;
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char line[513], *s;
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struct frentry *fr;
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u_int add = SIOCADAFR, del = SIOCRMAFR;
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(void) opendevice();
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if (opts & OPT_INACTIVE) {
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add = SIOCADIFR;
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del = SIOCRMIFR;
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}
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if (opts & OPT_DEBUG)
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printf("add %x del %x\n", add, del);
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initparse();
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if (!strcmp(file, "-"))
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fp = stdin;
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else if (!(fp = fopen(file, "r"))) {
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fprintf(stderr, "%s: fopen(%s) failed: %s\n", name, file,
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STRERROR(errno));
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exit(1);
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}
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while (getline(line, sizeof(line)-1, fp)) {
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/*
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* treat both CR and LF as EOL
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*/
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if ((s = index(line, '\n')))
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*s = '\0';
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if ((s = index(line, '\r')))
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*s = '\0';
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/*
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* # is comment marker, everything after is a ignored
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*/
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if ((s = index(line, '#')))
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*s = '\0';
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if (!*line)
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continue;
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if (opts & OPT_VERBOSE)
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(void)fprintf(stderr, "[%s]\n",line);
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fr = parse(line);
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(void)fflush(stdout);
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if (fr) {
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if (opts & OPT_ZERORULEST)
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add = SIOCZRLST;
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else if (opts & OPT_INACTIVE)
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add = fr->fr_hits ? SIOCINIFR : SIOCADIFR;
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else
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add = fr->fr_hits ? SIOCINAFR : SIOCADAFR;
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if (fr->fr_hits)
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fr->fr_hits--;
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if (fr && (opts & OPT_VERBOSE))
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printfr(fr);
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if (fr && (opts & OPT_OUTQUE))
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fr->fr_flags |= FR_OUTQUE;
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if (opts & OPT_DEBUG)
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binprint(fr);
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if ((opts & OPT_ZERORULEST) &&
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!(opts & OPT_DONOTHING)) {
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if (ioctl(fd, add, fr) == -1)
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perror("ioctl(SIOCZRLST)");
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else {
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printf("hits %ld bytes %ld ",
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fr->fr_hits, fr->fr_bytes);
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printfr(fr);
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}
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} else if ((opts & OPT_REMOVE) &&
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!(opts & OPT_DONOTHING)) {
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if (ioctl(fd, del, fr) == -1)
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perror("ioctl(SIOCDELFR)");
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} else if (!(opts & OPT_DONOTHING)) {
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if (ioctl(fd, add, fr) == -1)
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perror("ioctl(SIOCADDFR)");
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}
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}
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}
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(void)fclose(fp);
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}
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/*
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* Similar to fgets(3) but can handle '\\'
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*/
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static char *getline(str, size, file)
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register char *str;
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size_t size;
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FILE *file;
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{
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register char *p;
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do {
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for (p = str;; p+= strlen(p) - 1) {
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if (!fgets(p, size, file))
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return(NULL);
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p[strlen(p) -1] = '\0';
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if (p[strlen(p) - 1] != '\\')
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break;
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}
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} while (*str == '\0' || *str == '\n');
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return(str);
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}
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static void packetlogon(opt)
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char *opt;
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{
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int err, flag = 0;
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if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE) {
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if ((err = ioctl(fd, SIOCGETFF, &flag)))
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perror("ioctl(SIOCGETFF)");
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printf("log flag is currently %#x\n", flag);
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}
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flag &= ~(FF_LOGPASS|FF_LOGNOMATCH|FF_LOGBLOCK);
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if (index(opt, 'p')) {
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flag |= FF_LOGPASS;
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if (opts & OPT_VERBOSE)
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printf("set log flag: pass\n");
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}
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if (index(opt, 'm') && (*opt == 'n' || *opt == 'N')) {
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flag |= FF_LOGNOMATCH;
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if (opts & OPT_VERBOSE)
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printf("set log flag: nomatch\n");
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}
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if (index(opt, 'b') || index(opt, 'd')) {
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flag |= FF_LOGBLOCK;
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if (opts & OPT_VERBOSE)
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printf("set log flag: block\n");
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}
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if (opendevice() != -2 && (err = ioctl(fd, SIOCSETFF, &flag)))
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perror("ioctl(SIOCSETFF)");
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if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE) {
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if ((err = ioctl(fd, SIOCGETFF, &flag)))
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perror("ioctl(SIOCGETFF)");
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printf("log flag is now %#x\n", flag);
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}
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}
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static void flushfilter(arg)
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char *arg;
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{
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int fl = 0, rem;
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if (!arg || !*arg)
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return;
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if (strchr(arg, 'i') || strchr(arg, 'I'))
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fl = FR_INQUE;
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if (strchr(arg, 'o') || strchr(arg, 'O'))
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fl = FR_OUTQUE;
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if (strchr(arg, 'a') || strchr(arg, 'A'))
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fl = FR_OUTQUE|FR_INQUE;
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fl |= (opts & FR_INACTIVE);
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rem = fl;
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if (opendevice() != -2 && ioctl(fd, SIOCIPFFL, &fl) == -1)
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perror("ioctl(SIOCIPFFL)");
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if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE) {
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printf("remove flags %s%s (%d)\n", (rem & FR_INQUE) ? "I" : "",
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(rem & FR_OUTQUE) ? "O" : "", rem);
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printf("removed %d filter rules\n", fl);
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}
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return;
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}
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static void swapactive()
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{
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int in = 2;
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if (opendevice() != -2 && ioctl(fd, SIOCSWAPA, &in) == -1)
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perror("ioctl(SIOCSWAPA)");
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else
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printf("Set %d now inactive\n", in);
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}
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#if defined(sun) && (defined(__SVR4) || defined(__svr4__))
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void frsync()
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{
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if (opendevice() != -2 && ioctl(fd, SIOCFRSYN, 0) == -1)
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perror("SIOCFRSYN");
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else
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printf("filter sync'd\n");
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}
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#endif
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void zerostats()
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{
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friostat_t fio;
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if (opendevice() != -2) {
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if (ioctl(fd, SIOCFRZST, &fio) == -1) {
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perror("ioctl(SIOCFRZST)");
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exit(-1);
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}
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showstats(&fio);
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}
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}
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/*
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* read the kernel stats for packets blocked and passed
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*/
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static void showstats(fp)
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friostat_t *fp;
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{
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#if SOLARIS
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printf("dropped packets:\tin %lu\tout %lu\n",
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fp->f_st[0].fr_drop, fp->f_st[1].fr_drop);
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printf("non-ip packets:\t\tin %lu\tout %lu\n",
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fp->f_st[0].fr_notip, fp->f_st[1].fr_notip);
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printf(" bad packets:\t\tin %lu\tout %lu\n",
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fp->f_st[0].fr_bad, fp->f_st[1].fr_bad);
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#endif
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printf(" input packets:\t\tblocked %lu passed %lu nomatch %lu",
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fp->f_st[0].fr_block, fp->f_st[0].fr_pass,
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fp->f_st[0].fr_nom);
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printf(" counted %lu\n", fp->f_st[0].fr_acct);
|
||
|
|
printf("output packets:\t\tblocked %lu passed %lu nomatch %lu",
|
||
|
|
fp->f_st[1].fr_block, fp->f_st[1].fr_pass,
|
||
|
|
fp->f_st[1].fr_nom);
|
||
|
|
printf(" counted %lu\n", fp->f_st[0].fr_acct);
|
||
|
|
printf(" input packets logged:\tblocked %lu passed %lu\n",
|
||
|
|
fp->f_st[0].fr_bpkl, fp->f_st[0].fr_ppkl);
|
||
|
|
printf("output packets logged:\tblocked %lu passed %lu\n",
|
||
|
|
fp->f_st[1].fr_bpkl, fp->f_st[1].fr_ppkl);
|
||
|
|
printf(" packets logged:\tinput %lu-%lu output %lu-%lu\n",
|
||
|
|
fp->f_st[0].fr_pkl, fp->f_st[0].fr_skip,
|
||
|
|
fp->f_st[1].fr_pkl, fp->f_st[1].fr_skip);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#if SOLARIS
|
||
|
|
void blockunknown()
|
||
|
|
{
|
||
|
|
int flag;
|
||
|
|
|
||
|
|
if (opendevice() == -1)
|
||
|
|
return;
|
||
|
|
|
||
|
|
if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE) {
|
||
|
|
if (ioctl(fd, SIOCGETFF, &flag))
|
||
|
|
perror("ioctl(SIOCGETFF)");
|
||
|
|
|
||
|
|
printf("log flag is currently %#x\n", flag);
|
||
|
|
}
|
||
|
|
|
||
|
|
flag ^= FF_BLOCKNONIP;
|
||
|
|
|
||
|
|
if (opendevice() != -2 && ioctl(fd, SIOCSETFF, &flag))
|
||
|
|
perror("ioctl(SIOCSETFF)");
|
||
|
|
|
||
|
|
if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE) {
|
||
|
|
if (ioctl(fd, SIOCGETFF, &flag))
|
||
|
|
perror("ioctl(SIOCGETFF)");
|
||
|
|
|
||
|
|
printf("log flag is now %#x\n", flag);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif
|