#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#if !defined(__SVR4) && !defined(__GNUC__)
#include <strings.h>
#endif
#include <sys/types.h>
#include <sys/param.h>
#include <sys/file.h>
#include <stdlib.h>
#include <stddef.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <sys/time.h>
#include <net/if.h>
#include <netinet/ip.h>
#include <netdb.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include "ipf.h"
#include "netinet/ipl.h"
#ifndef IPF_SAVEDIR
# define IPF_SAVEDIR "/var/db/ipf"
#endif
#ifndef IPF_NATFILE
# define IPF_NATFILE "ipnat.ipf"
#endif
#ifndef IPF_STATEFILE
# define IPF_STATEFILE "ipstate.ipf"
#endif
#if !defined(__SVR4) && defined(__GNUC__)
extern char *index(const char *, int);
#endif
extern char *optarg;
extern int optind;
int main(int, char *[]);
void usage(void);
int changestateif(char *, char *);
int changenatif(char *, char *);
int readstate(int, char *);
int readnat(int, char *);
int writestate(int, char *);
int opendevice(char *);
void closedevice(int);
int setlock(int, int);
int writeall(char *);
int readall(char *);
int writenat(int, char *);
int opts = 0;
char *progname;
void usage()
{
fprintf(stderr, "usage: %s [-nv] -l\n", progname);
fprintf(stderr, "usage: %s [-nv] -u\n", progname);
fprintf(stderr, "usage: %s [-nv] [-d <dir>] -R\n", progname);
fprintf(stderr, "usage: %s [-nv] [-d <dir>] -W\n", progname);
fprintf(stderr, "usage: %s [-nNSv] [-f <file>] -r\n", progname);
fprintf(stderr, "usage: %s [-nNSv] [-f <file>] -w\n", progname);
fprintf(stderr, "usage: %s [-nNSv] -f <filename> -i <if1>,<if2>\n",
progname);
exit(1);
}
int changestateif(char *ifs, char *fname)
{
int fd, olen, nlen, rw;
ipstate_save_t ips;
off_t pos;
char *s;
s = strchr(ifs, ',');
if (!s)
usage();
*s++ = '\0';
nlen = strlen(s);
olen = strlen(ifs);
if (nlen >= sizeof(ips.ips_is.is_ifname) ||
olen >= sizeof(ips.ips_is.is_ifname))
usage();
fd = open(fname, O_RDWR);
if (fd == -1) {
perror("open");
exit(1);
}
for (pos = 0; read(fd, &ips, sizeof(ips)) == sizeof(ips); ) {
rw = 0;
if (!strncmp(ips.ips_is.is_ifname[0], ifs, olen + 1)) {
strcpy(ips.ips_is.is_ifname[0], s);
rw = 1;
}
if (!strncmp(ips.ips_is.is_ifname[1], ifs, olen + 1)) {
strcpy(ips.ips_is.is_ifname[1], s);
rw = 1;
}
if (!strncmp(ips.ips_is.is_ifname[2], ifs, olen + 1)) {
strcpy(ips.ips_is.is_ifname[2], s);
rw = 1;
}
if (!strncmp(ips.ips_is.is_ifname[3], ifs, olen + 1)) {
strcpy(ips.ips_is.is_ifname[3], s);
rw = 1;
}
if (rw == 1) {
if (lseek(fd, pos, SEEK_SET) != pos) {
perror("lseek");
exit(1);
}
if (write(fd, &ips, sizeof(ips)) != sizeof(ips)) {
perror("write");
exit(1);
}
}
pos = lseek(fd, 0, SEEK_CUR);
}
close(fd);
return (0);
}
int changenatif(char *ifs, char *fname)
{
int fd, olen, nlen, rw;
nat_save_t ipn;
nat_t *nat;
off_t pos;
char *s;
s = strchr(ifs, ',');
if (!s)
usage();
*s++ = '\0';
nlen = strlen(s);
olen = strlen(ifs);
nat = &ipn.ipn_nat;
if (nlen >= sizeof(nat->nat_ifnames[0]) ||
olen >= sizeof(nat->nat_ifnames[0]))
usage();
fd = open(fname, O_RDWR);
if (fd == -1) {
perror("open");
exit(1);
}
for (pos = 0; read(fd, &ipn, sizeof(ipn)) == sizeof(ipn); ) {
rw = 0;
if (!strncmp(nat->nat_ifnames[0], ifs, olen + 1)) {
strcpy(nat->nat_ifnames[0], s);
rw = 1;
}
if (!strncmp(nat->nat_ifnames[1], ifs, olen + 1)) {
strcpy(nat->nat_ifnames[1], s);
rw = 1;
}
if (rw == 1) {
if (lseek(fd, pos, SEEK_SET) != pos) {
perror("lseek");
exit(1);
}
if (write(fd, &ipn, sizeof(ipn)) != sizeof(ipn)) {
perror("write");
exit(1);
}
}
pos = lseek(fd, 0, SEEK_CUR);
}
close(fd);
return (0);
}
int main(int argc, char *argv[])
{
int c, lock = -1, devfd = -1, err = 0, rw = -1, ns = -1, set = 0;
char *dirname = NULL, *filename = NULL, *ifs = NULL;
progname = argv[0];
while ((c = getopt(argc, argv, "d:f:i:lNnSRruvWw")) != -1)
switch (c)
{
case 'd' :
if ((set == 0) && !dirname && !filename)
dirname = optarg;
else
usage();
break;
case 'f' :
if ((set != 0) && !dirname && !filename)
filename = optarg;
else
usage();
break;
case 'i' :
ifs = optarg;
set = 1;
break;
case 'l' :
if (filename || dirname || set)
usage();
lock = 1;
set = 1;
break;
case 'n' :
opts |= OPT_DONOTHING;
break;
case 'N' :
if ((ns >= 0) || dirname || (rw != -1) || set)
usage();
ns = 0;
set = 1;
break;
case 'r' :
if (dirname || (rw != -1) || (ns == -1))
usage();
rw = 0;
set = 1;
break;
case 'R' :
rw = 2;
set = 1;
break;
case 'S' :
if ((ns >= 0) || dirname || (rw != -1) || set)
usage();
ns = 1;
set = 1;
break;
case 'u' :
if (filename || dirname || set)
usage();
lock = 0;
set = 1;
break;
case 'v' :
opts |= OPT_VERBOSE;
break;
case 'w' :
if (dirname || (rw != -1) || (ns == -1))
usage();
rw = 1;
set = 1;
break;
case 'W' :
rw = 3;
set = 1;
break;
case '?' :
default :
usage();
}
if (ifs) {
if (!filename || ns < 0)
usage();
if (ns == 0)
return (changenatif(ifs, filename));
else
return (changestateif(ifs, filename));
}
if ((ns >= 0) || (lock >= 0)) {
if (lock >= 0)
devfd = opendevice(NULL);
else if (ns >= 0) {
if (ns == 1)
devfd = opendevice(IPSTATE_NAME);
else if (ns == 0)
devfd = opendevice(IPNAT_NAME);
}
if (devfd == -1)
exit(1);
}
if (lock >= 0)
err = setlock(devfd, lock);
else if (rw >= 0) {
if (rw & 1) {
if (rw & 2)
err = writeall(dirname);
else {
if (ns == 0)
err = writenat(devfd, filename);
else if (ns == 1)
err = writestate(devfd, filename);
}
} else {
if (rw & 2)
err = readall(dirname);
else {
if (ns == 0)
err = readnat(devfd, filename);
else if (ns == 1)
err = readstate(devfd, filename);
}
}
}
return (err);
}
int opendevice(char *ipfdev)
{
int fd = -1;
if (opts & OPT_DONOTHING)
return (-2);
if (!ipfdev)
ipfdev = IPL_NAME;
if ((fd = open(ipfdev, O_RDWR)) == -1)
if ((fd = open(ipfdev, O_RDONLY)) == -1)
perror("open device");
return (fd);
}
void closedevice(int fd)
{
close(fd);
}
int setlock(int fd, int lock)
{
if (opts & OPT_VERBOSE)
printf("Turn lock %s\n", lock ? "on" : "off");
if (!(opts & OPT_DONOTHING)) {
if (ioctl(fd, SIOCSTLCK, &lock) == -1) {
perror("SIOCSTLCK");
return (1);
}
if (opts & OPT_VERBOSE)
printf("Lock now %s\n", lock ? "on" : "off");
}
return (0);
}
int writestate(int fd, char *file)
{
ipstate_save_t ips, *ipsp;
ipfobj_t obj;
int wfd = -1;
if (!file)
file = IPF_STATEFILE;
wfd = open(file, O_WRONLY|O_TRUNC|O_CREAT, 0600);
if (wfd == -1) {
fprintf(stderr, "%s ", file);
perror("state:open");
return (1);
}
ipsp = &ips;
bzero((char *)&obj, sizeof(obj));
bzero((char *)ipsp, sizeof(ips));
obj.ipfo_rev = IPFILTER_VERSION;
obj.ipfo_size = sizeof(*ipsp);
obj.ipfo_type = IPFOBJ_STATESAVE;
obj.ipfo_ptr = ipsp;
do {
if (opts & OPT_VERBOSE)
printf("Getting state from addr %p\n", ips.ips_next);
if (ioctl(fd, SIOCSTGET, &obj)) {
if (errno == ENOENT)
break;
perror("state:SIOCSTGET");
close(wfd);
return (1);
}
if (opts & OPT_VERBOSE)
printf("Got state next %p\n", ips.ips_next);
if (write(wfd, ipsp, sizeof(ips)) != sizeof(ips)) {
perror("state:write");
close(wfd);
return (1);
}
} while (ips.ips_next != NULL);
close(wfd);
return (0);
}
int readstate(int fd, char *file)
{
ipstate_save_t ips, *is, *ipshead = NULL, *is1, *ipstail = NULL;
int sfd = -1, i;
ipfobj_t obj;
if (!file)
file = IPF_STATEFILE;
sfd = open(file, O_RDONLY, 0600);
if (sfd == -1) {
fprintf(stderr, "%s ", file);
perror("open");
return (1);
}
bzero((char *)&ips, sizeof(ips));
do {
i = read(sfd, &ips, sizeof(ips));
if (i == -1) {
perror("read");
goto freeipshead;
}
if (i == 0)
break;
if (i != sizeof(ips)) {
fprintf(stderr, "state:incomplete read: %d != %d\n",
i, (int)sizeof(ips));
goto freeipshead;
}
is = (ipstate_save_t *)malloc(sizeof(*is));
if (is == NULL) {
fprintf(stderr, "malloc failed\n");
goto freeipshead;
}
bcopy((char *)&ips, (char *)is, sizeof(ips));
for (is1 = ipshead; is1 != NULL; is1 = is1->ips_next)
if (is1->ips_rule == is->ips_rule)
break;
if (is1 == NULL)
is->ips_is.is_flags |= SI_NEWFR;
else
is->ips_rule = (void *)&is1->ips_rule;
is->ips_next = NULL;
if (!ipshead)
ipshead = is;
if (ipstail)
ipstail->ips_next = is;
ipstail = is;
} while (1);
close(sfd);
obj.ipfo_rev = IPFILTER_VERSION;
obj.ipfo_size = sizeof(*is);
obj.ipfo_type = IPFOBJ_STATESAVE;
while ((is = ipshead) != NULL) {
if (opts & OPT_VERBOSE)
printf("Loading new state table entry\n");
if (is->ips_is.is_flags & SI_NEWFR) {
if (opts & OPT_VERBOSE)
printf("Loading new filter rule\n");
}
obj.ipfo_ptr = is;
if (!(opts & OPT_DONOTHING))
if (ioctl(fd, SIOCSTPUT, &obj)) {
perror("SIOCSTPUT");
goto freeipshead;
}
if (is->ips_is.is_flags & SI_NEWFR) {
if (opts & OPT_VERBOSE)
printf("Real rule addr %p\n", is->ips_rule);
for (is1 = is->ips_next; is1; is1 = is1->ips_next)
if (is1->ips_rule == (frentry_t *)&is->ips_rule)
is1->ips_rule = is->ips_rule;
}
ipshead = is->ips_next;
free(is);
}
return (0);
freeipshead:
while ((is = ipshead) != NULL) {
ipshead = is->ips_next;
free(is);
}
if (sfd != -1)
close(sfd);
return (1);
}
int readnat(int fd, char *file)
{
nat_save_t ipn, *in, *ipnhead = NULL, *in1, *ipntail = NULL;
ipfobj_t obj;
int nfd, i;
nat_t *nat;
char *s;
int n;
nfd = -1;
in = NULL;
ipnhead = NULL;
ipntail = NULL;
if (!file)
file = IPF_NATFILE;
nfd = open(file, O_RDONLY);
if (nfd == -1) {
fprintf(stderr, "%s ", file);
perror("nat:open");
return (1);
}
bzero((char *)&ipn, sizeof(ipn));
do {
i = read(nfd, &ipn, sizeof(ipn));
if (i == -1) {
perror("read");
goto freenathead;
}
if (i == 0)
break;
if (i != sizeof(ipn)) {
fprintf(stderr, "nat:incomplete read: %d != %d\n",
i, (int)sizeof(ipn));
goto freenathead;
}
in = (nat_save_t *)malloc(ipn.ipn_dsize);
if (in == NULL) {
fprintf(stderr, "nat:cannot malloc nat save struct\n");
goto freenathead;
}
if (ipn.ipn_dsize > sizeof(ipn)) {
n = ipn.ipn_dsize - sizeof(ipn);
if (n > 0) {
s = in->ipn_data + sizeof(in->ipn_data);
i = read(nfd, s, n);
if (i == 0)
break;
if (i != n) {
fprintf(stderr,
"nat:incomplete read: %d != %d\n",
i, n);
goto freenathead;
}
}
}
bcopy((char *)&ipn, (char *)in, sizeof(ipn));
nat = &in->ipn_nat;
if (nat->nat_fr != NULL) {
for (in1 = ipnhead; in1 != NULL; in1 = in1->ipn_next)
if (in1->ipn_rule == nat->nat_fr)
break;
if (in1 == NULL)
nat->nat_flags |= SI_NEWFR;
else
nat->nat_fr = &in1->ipn_fr;
}
in->ipn_next = NULL;
if (!ipnhead)
ipnhead = in;
if (ipntail)
ipntail->ipn_next = in;
ipntail = in;
} while (1);
close(nfd);
nfd = -1;
obj.ipfo_rev = IPFILTER_VERSION;
obj.ipfo_type = IPFOBJ_NATSAVE;
while ((in = ipnhead) != NULL) {
if (opts & OPT_VERBOSE)
printf("Loading new NAT table entry\n");
nat = &in->ipn_nat;
if (nat->nat_flags & SI_NEWFR) {
if (opts & OPT_VERBOSE)
printf("Loading new filter rule\n");
}
obj.ipfo_ptr = in;
obj.ipfo_size = in->ipn_dsize;
if (!(opts & OPT_DONOTHING))
if (ioctl(fd, SIOCSTPUT, &obj)) {
fprintf(stderr, "in=%p:", in);
perror("SIOCSTPUT");
return (1);
}
if (nat->nat_flags & SI_NEWFR) {
if (opts & OPT_VERBOSE)
printf("Real rule addr %p\n", nat->nat_fr);
for (in1 = in->ipn_next; in1; in1 = in1->ipn_next)
if (in1->ipn_rule == &in->ipn_fr)
in1->ipn_rule = nat->nat_fr;
}
ipnhead = in->ipn_next;
free(in);
}
return (0);
freenathead:
while ((in = ipnhead) != NULL) {
ipnhead = in->ipn_next;
free(in);
}
if (nfd != -1)
close(nfd);
return (1);
}
int writenat(int fd, char *file)
{
nat_save_t *ipnp = NULL, *next = NULL;
ipfobj_t obj;
int nfd = -1;
natget_t ng;
if (!file)
file = IPF_NATFILE;
nfd = open(file, O_WRONLY|O_TRUNC|O_CREAT, 0600);
if (nfd == -1) {
fprintf(stderr, "%s ", file);
perror("nat:open");
return (1);
}
obj.ipfo_rev = IPFILTER_VERSION;
obj.ipfo_type = IPFOBJ_NATSAVE;
do {
if (opts & OPT_VERBOSE)
printf("Getting nat from addr %p\n", ipnp);
ng.ng_ptr = next;
ng.ng_sz = 0;
if (ioctl(fd, SIOCSTGSZ, &ng)) {
perror("nat:SIOCSTGSZ");
close(nfd);
if (ipnp != NULL)
free(ipnp);
return (1);
}
if (opts & OPT_VERBOSE)
printf("NAT size %d from %p\n", ng.ng_sz, ng.ng_ptr);
if (ng.ng_sz == 0)
break;
if (!ipnp)
ipnp = malloc(ng.ng_sz);
else
ipnp = realloc((char *)ipnp, ng.ng_sz);
if (!ipnp) {
fprintf(stderr,
"malloc for %d bytes failed\n", ng.ng_sz);
break;
}
bzero((char *)ipnp, ng.ng_sz);
obj.ipfo_size = ng.ng_sz;
obj.ipfo_ptr = ipnp;
ipnp->ipn_dsize = ng.ng_sz;
ipnp->ipn_next = next;
if (ioctl(fd, SIOCSTGET, &obj)) {
if (errno == ENOENT)
break;
perror("nat:SIOCSTGET");
close(nfd);
free(ipnp);
return (1);
}
if (opts & OPT_VERBOSE)
printf("Got nat next %p ipn_dsize %d ng_sz %d\n",
ipnp->ipn_next, ipnp->ipn_dsize, ng.ng_sz);
if (write(nfd, ipnp, ipnp->ipn_dsize) != ipnp->ipn_dsize) {
perror("nat:write");
close(nfd);
free(ipnp);
return (1);
}
next = ipnp->ipn_next;
} while (ipnp && next);
if (ipnp != NULL)
free(ipnp);
close(nfd);
return (0);
}
int writeall(char *dirname)
{
int fd, devfd;
if (!dirname)
dirname = IPF_SAVEDIR;
if (chdir(dirname)) {
fprintf(stderr, "IPF_SAVEDIR=%s: ", dirname);
perror("chdir(IPF_SAVEDIR)");
return (1);
}
fd = opendevice(NULL);
if (fd == -1)
return (1);
if (setlock(fd, 1)) {
close(fd);
return (1);
}
devfd = opendevice(IPSTATE_NAME);
if (devfd == -1)
goto bad;
if (writestate(devfd, NULL))
goto bad;
close(devfd);
devfd = opendevice(IPNAT_NAME);
if (devfd == -1)
goto bad;
if (writenat(devfd, NULL))
goto bad;
close(devfd);
if (setlock(fd, 0)) {
close(fd);
return (1);
}
close(fd);
return (0);
bad:
setlock(fd, 0);
close(fd);
return (1);
}
int readall(char *dirname)
{
int fd, devfd;
if (!dirname)
dirname = IPF_SAVEDIR;
if (chdir(dirname)) {
perror("chdir(IPF_SAVEDIR)");
return (1);
}
fd = opendevice(NULL);
if (fd == -1)
return (1);
if (setlock(fd, 1)) {
close(fd);
return (1);
}
devfd = opendevice(IPSTATE_NAME);
if (devfd == -1)
return (1);
if (readstate(devfd, NULL))
return (1);
close(devfd);
devfd = opendevice(IPNAT_NAME);
if (devfd == -1)
return (1);
if (readnat(devfd, NULL))
return (1);
close(devfd);
if (setlock(fd, 0)) {
close(fd);
return (1);
}
return (0);
}
