/* * Copyright (C) 1993-1997 by Darren Reed. * * Redistribution and use in source and binary forms are permitted * provided that this notice is preserved and due credit is given * to the original author and the contributors. */ #ifdef __FreeBSD__ # include #endif #include #include #include #include #include #if !defined(__SVR4) && !defined(__GNUC__) #include #endif #include #include #include #include #include #include #include #include #include #include #include #if __FreeBSD_version >= 300000 # include #endif #include #include #include #include #include "ip_compat.h" #include "ip_fil.h" #include "ipf.h" #if !defined(lint) static const char sccsid[] = "@(#)ipf.c 1.23 6/5/96 (C) 1993-1995 Darren Reed"; static const char rcsid[] = "@(#)$Id: ipf.c,v 2.0.2.13.2.4 1998/05/23 14:29:44 darrenr Exp $"; #endif static void frsync __P((void)); #if SOLARIS static void blockunknown __P((void)); #endif #if !defined(__SVR4) && defined(__GNUC__) extern char *index __P((const char *, int)); #endif extern char *optarg; void zerostats __P((void)); int main __P((int, char *[])); int opts = 0; static int fd = -1; static void procfile __P((char *, char *)), flushfilter __P((char *)); static void set_state __P((u_int)), showstats __P((friostat_t *)); static void packetlogon __P((char *)), swapactive __P((void)); static int opendevice __P((char *)); static void closedevice __P((void)); static char *getline __P((char *, size_t, FILE *)); static char *ipfname = IPL_NAME; int main(argc,argv) int argc; char *argv[]; { int c; while ((c = getopt(argc, argv, "AdDEf:F:Il:noPrsUvyzZ")) != -1) { switch (c) { case 'A' : opts &= ~OPT_INACTIVE; break; case 'E' : set_state((u_int)1); break; case 'D' : set_state((u_int)0); break; case 'd' : opts |= OPT_DEBUG; break; case 'f' : procfile(argv[0], optarg); break; case 'F' : flushfilter(optarg); break; case 'I' : opts |= OPT_INACTIVE; break; case 'l' : packetlogon(optarg); break; case 'n' : opts |= OPT_DONOTHING; break; case 'o' : opts |= OPT_OUTQUE; break; case 'P' : ipfname = IPL_AUTH; break; case 'r' : opts |= OPT_REMOVE; break; case 's' : swapactive(); break; #if SOLARIS case 'U' : blockunknown(); break; #endif case 'v' : opts |= OPT_VERBOSE; break; case 'y' : frsync(); break; case 'z' : opts |= OPT_ZERORULEST; break; case 'Z' : zerostats(); break; } } if (fd != -1) (void) close(fd); exit(0); /* NOTREACHED */ } static int opendevice(ipfdev) char *ipfdev; { if (opts & OPT_DONOTHING) return -2; if (!ipfdev) ipfdev = ipfname; if (!(opts & OPT_DONOTHING) && fd == -1) if ((fd = open(ipfdev, O_RDWR)) == -1) if ((fd = open(ipfname, O_RDONLY)) == -1) perror("open device"); return fd; } static void closedevice() { close(fd); fd = -1; } static void set_state(enable) u_int enable; { if (opendevice(ipfname) != -2) if (ioctl(fd, SIOCFRENB, &enable) == -1) perror("SIOCFRENB"); return; } static void procfile(name, file) char *name, *file; { FILE *fp; char line[513], *s; struct frentry *fr; u_int add = SIOCADAFR, del = SIOCRMAFR; (void) opendevice(ipfname); if (opts & OPT_INACTIVE) { add = SIOCADIFR; del = SIOCRMIFR; } if (opts & OPT_DEBUG) printf("add %x del %x\n", add, del); initparse(); if (!strcmp(file, "-")) fp = stdin; else if (!(fp = fopen(file, "r"))) { fprintf(stderr, "%s: fopen(%s) failed: %s\n", name, file, STRERROR(errno)); exit(1); } while (getline(line, sizeof(line), fp)) { /* * treat CR as EOL. LF is converted to NUL by getline(). */ if ((s = index(line, '\r'))) *s = '\0'; /* * # is comment marker, everything after is a ignored */ if ((s = index(line, '#'))) *s = '\0'; if (!*line) continue; if (opts & OPT_VERBOSE) (void)fprintf(stderr, "[%s]\n", line); fr = parse(line); (void)fflush(stdout); if (fr) { if (opts & OPT_ZERORULEST) add = SIOCZRLST; else if (opts & OPT_INACTIVE) add = (u_int)fr->fr_hits ? SIOCINIFR : SIOCADIFR; else add = (u_int)fr->fr_hits ? SIOCINAFR : SIOCADAFR; if (fr->fr_hits) fr->fr_hits--; if (fr && (opts & OPT_VERBOSE)) printfr(fr); if (fr && (opts & OPT_OUTQUE)) fr->fr_flags |= FR_OUTQUE; if (opts & OPT_DEBUG) binprint(fr); if ((opts & OPT_ZERORULEST) && !(opts & OPT_DONOTHING)) { if (ioctl(fd, add, fr) == -1) perror("ioctl(SIOCZRLST)"); else { #ifdef USE_QUAD_T printf("hits %qd bytes %qd ", #else printf("hits %ld bytes %ld ", #endif fr->fr_hits, fr->fr_bytes); printfr(fr); } } else if ((opts & OPT_REMOVE) && !(opts & OPT_DONOTHING)) { if (ioctl(fd, del, fr) == -1) perror("ioctl(SIOCDELFR)"); } else if (!(opts & OPT_DONOTHING)) { if (ioctl(fd, add, fr) == -1) perror("ioctl(SIOCADDFR)"); } } } if (ferror(fp) || !feof(fp)) { fprintf(stderr, "%s: %s: file error or line too long\n", name, file); exit(1); } (void)fclose(fp); } /* * Similar to fgets(3) but can handle '\\' and NL is converted to NUL. * Returns NULL if error occured, EOF encounterd or input line is too long. */ static char *getline(str, size, file) register char *str; size_t size; FILE *file; { char *p; int s, len; do { for (p = str, s = size;; p += len, s -= len) { /* * if an error occured, EOF was encounterd, or there * was no room to put NUL, return NULL. */ if (fgets(p, s, file) == NULL) return (NULL); len = strlen(p); p[len - 1] = '\0'; if (p[len - 1] != '\\') break; size -= len; } } while (*str == '\0' || *str == '\n'); return (str); } static void packetlogon(opt) char *opt; { int err, flag = 0; if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE) { if ((err = ioctl(fd, SIOCGETFF, &flag))) perror("ioctl(SIOCGETFF)"); printf("log flag is currently %#x\n", flag); } flag &= ~(FF_LOGPASS|FF_LOGNOMATCH|FF_LOGBLOCK); if (index(opt, 'p')) { flag |= FF_LOGPASS; if (opts & OPT_VERBOSE) printf("set log flag: pass\n"); } if (index(opt, 'm') && (*opt == 'n' || *opt == 'N')) { flag |= FF_LOGNOMATCH; if (opts & OPT_VERBOSE) printf("set log flag: nomatch\n"); } if (index(opt, 'b') || index(opt, 'd')) { flag |= FF_LOGBLOCK; if (opts & OPT_VERBOSE) printf("set log flag: block\n"); } if (opendevice(ipfname) != -2 && (err = ioctl(fd, SIOCSETFF, &flag))) perror("ioctl(SIOCSETFF)"); if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE) { if ((err = ioctl(fd, SIOCGETFF, &flag))) perror("ioctl(SIOCGETFF)"); printf("log flag is now %#x\n", flag); } } static void flushfilter(arg) char *arg; { int fl = 0, rem; if (!arg || !*arg) return; if (!strcmp(arg, "s") || !strcmp(arg, "S")) { if (*arg == 'S') fl = 0; else fl = 1; rem = fl; closedevice(); if (opendevice(IPL_STATE) != -2 && ioctl(fd, SIOCIPFFL, &fl) == -1) perror("ioctl(SIOCIPFFL)"); if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE) { printf("remove flags %s (%d)\n", arg, rem); printf("removed %d filter rules\n", fl); } closedevice(); return; } if (strchr(arg, 'i') || strchr(arg, 'I')) fl = FR_INQUE; if (strchr(arg, 'o') || strchr(arg, 'O')) fl = FR_OUTQUE; if (strchr(arg, 'a') || strchr(arg, 'A')) fl = FR_OUTQUE|FR_INQUE; fl |= (opts & FR_INACTIVE); rem = fl; if (opendevice(ipfname) != -2 && ioctl(fd, SIOCIPFFL, &fl) == -1) perror("ioctl(SIOCIPFFL)"); if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE) { printf("remove flags %s%s (%d)\n", (rem & FR_INQUE) ? "I" : "", (rem & FR_OUTQUE) ? "O" : "", rem); printf("removed %d filter rules\n", fl); } return; } static void swapactive() { int in = 2; if (opendevice(ipfname) != -2 && ioctl(fd, SIOCSWAPA, &in) == -1) perror("ioctl(SIOCSWAPA)"); else printf("Set %d now inactive\n", in); } static void frsync() { int frsyn = 0; if (opendevice(ipfname) != -2 && ioctl(fd, SIOCFRSYN, &frsyn) == -1) perror("SIOCFRSYN"); else printf("filter sync'd\n"); } void zerostats() { friostat_t fio; if (opendevice(ipfname) != -2) { if (ioctl(fd, SIOCFRZST, &fio) == -1) { perror("ioctl(SIOCFRZST)"); exit(-1); } showstats(&fio); } } /* * read the kernel stats for packets blocked and passed */ static void showstats(fp) friostat_t *fp; { #if SOLARIS printf("dropped packets:\tin %lu\tout %lu\n", fp->f_st[0].fr_drop, fp->f_st[1].fr_drop); printf("non-ip packets:\t\tin %lu\tout %lu\n", fp->f_st[0].fr_notip, fp->f_st[1].fr_notip); printf(" bad packets:\t\tin %lu\tout %lu\n", fp->f_st[0].fr_bad, fp->f_st[1].fr_bad); #endif printf(" input packets:\t\tblocked %lu passed %lu nomatch %lu", fp->f_st[0].fr_block, fp->f_st[0].fr_pass, fp->f_st[0].fr_nom); 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 static void blockunknown() { int flag; if (opendevice(ipfname) == -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(ipfname) != -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