/**
* Install filter for hijacked connection
*
*/
static int hijack_install_filter ( struct hijack *hijack,
char *filter ) {
struct bpf_program program;
/* Compile filter */
if ( pcap_compile ( hijack->pcap, &program, filter, 1, 0 ) < 0 ) {
logmsg ( LOG_ERR, "could not compile filter \"%s\": %s\n",
filter, pcap_geterr ( hijack->pcap ) );
goto err_nofree;
}
/* Install filter */
if ( pcap_setfilter ( hijack->pcap, &program ) < 0 ) {
logmsg ( LOG_ERR, "could not install filter \"%s\": %s\n",
filter, pcap_geterr ( hijack->pcap ) );
goto err;
}
logmsg ( LOG_INFO, "using filter \"%s\"\n", filter );
pcap_freecode ( &program );
return 0;
err:
pcap_freecode ( &program );
err_nofree:
return -1;
}
PyObject *
captureObject_filter(captureObject *self, PyObject *args)
{
char *filter = NULL;
int optimize = 0;
unsigned int netmask = 0xffffffff;
struct bpf_program prog;
if (! PyArg_ParseTuple(args, "s|i:filter", &filter, &optimize))
return NULL;
if (pcap_compile(self->pcap, &prog, filter, optimize, netmask))
{
PyErr_SetString(ErrorObject, pcap_geterr(self->pcap));
return NULL;
}
if (pcap_setfilter(self->pcap, &prog))
{
pcap_freecode(&prog);
PyErr_SetString(ErrorObject, pcap_geterr(self->pcap));
return NULL;
}
pcap_freecode(&prog);
return Py_BuildValue("");
}
int
tc_pcap_socket_in_init(pcap_t **pd, char *device,
int snap_len, int buf_size, char *pcap_filter)
{
int fd;
char ebuf[PCAP_ERRBUF_SIZE];
struct bpf_program fp;
bpf_u_int32 net, netmask;
if (device == NULL) {
return TC_INVALID_SOCK;
}
tc_log_info(LOG_NOTICE, 0, "pcap open,device:%s", device);
*ebuf = '\0';
if (tc_pcap_open(pd, device, snap_len, buf_size) == TC_ERR) {
return TC_INVALID_SOCK;
}
if (pcap_lookupnet(device, &net, &netmask, ebuf) < 0) {
net = 0;
netmask = 0;
tc_log_info(LOG_WARN, 0, "lookupnet:%s", ebuf);
return TC_INVALID_SOCK;
}
if (pcap_compile(*pd, &fp, pcap_filter, 0, netmask) == -1) {
tc_log_info(LOG_ERR, 0, "couldn't parse filter %s: %s",
pcap_filter, pcap_geterr(*pd));
return TC_INVALID_SOCK;
}
if (pcap_setfilter(*pd, &fp) == -1) {
tc_log_info(LOG_ERR, 0, "couldn't install filter %s: %s",
pcap_filter, pcap_geterr(*pd));
pcap_freecode(&fp);
return TC_INVALID_SOCK;
}
pcap_freecode(&fp);
if (pcap_get_selectable_fd(*pd) == -1) {
tc_log_info(LOG_ERR, 0, "pcap_get_selectable_fd fails");
return TC_INVALID_SOCK;
}
if (pcap_setnonblock(*pd, 1, ebuf) == -1) {
tc_log_info(LOG_ERR, 0, "pcap_setnonblock failed: %s", ebuf);
return TC_INVALID_SOCK;
}
fd = pcap_get_selectable_fd(*pd);
return fd;
}
/*
* privileged part of priv_pcap_setfilter, compile the filter
* expression, and return it to the parent. Note that we fake an hpcap
* and use it to capture the error messages, and pass the error back
* to client.
*/
int
setfilter(int bpfd, int sock, char *filter)
{
struct bpf_program fcode;
int oflag, snap, link;
u_int32_t netmask;
pcap_t hpcap;
must_read(sock, &oflag, sizeof(oflag));
must_read(sock, &netmask, sizeof(netmask));
must_read(sock, &snap, sizeof(snap));
must_read(sock, &link, sizeof(link));
if (snap < 0) {
snprintf(hpcap.errbuf, PCAP_ERRBUF_SIZE, "invalid snaplen");
goto err;
}
/* fake hpcap, it only needs errbuf, snaplen, and linktype to
* compile a filter expression */
/* XXX messing with pcap internals */
hpcap.snapshot = snap;
hpcap.linktype = link;
if (pcap_compile(&hpcap, &fcode, filter, oflag, netmask))
goto err;
/* if bpf descriptor is open, set the filter XXX check oflag? */
if (bpfd >= 0 && ioctl(bpfd, BIOCSETF, &fcode)) {
snprintf(hpcap.errbuf, PCAP_ERRBUF_SIZE,
"ioctl: BIOCSETF: %s", strerror(errno));
pcap_freecode(&fcode);
goto err;
}
if (fcode.bf_len > 0) {
/* write the filter */
must_write(sock, &fcode.bf_len, sizeof(fcode.bf_len));
must_write(sock, fcode.bf_insns,
fcode.bf_len * sizeof(struct bpf_insn));
} else {
snprintf(hpcap.errbuf, PCAP_ERRBUF_SIZE, "Invalid filter size");
pcap_freecode(&fcode);
goto err;
}
pcap_freecode(&fcode);
return (0);
err:
fcode.bf_len = 0;
must_write(sock, &fcode.bf_len, sizeof(fcode.bf_len));
/* write back the error string */
write_string(sock, hpcap.errbuf);
return (1);
}
void startSniffer(char *filter)
{
struct in_addr in;
if (dev == NULL)
if ((dev = pcap_lookupdev(errbuf)) == NULL) {
fprintf(stderr, "startSniffer: couldn't find a device to sniff: %s\n", errbuf);
exit(1);
}
printf("\n\n%s starting: listening on device: %s\n", VERSION, dev);
if ((pd = pcap_open_live(dev, SNAPLEN, promisc, readtimeout, errbuf)) == NULL) {
fprintf(stderr, "startSniffer: pcap_open_live failed: %s\n", errbuf);
exit(1);
}
pcap_lookupnet(dev, &netp, &maskp, errbuf);
in.s_addr = netp;
printf("%s (%s/", dev, inet_ntoa(in));
in.s_addr = maskp;
printf("%s) opened successfully in %spromiscuous mode\n", inet_ntoa(in), (promisc ? "" : "non-"));
if (filter != NULL) {
pcap_compile(pd, &fprog, filter, 0, netp);
if ((pcap_setfilter(pd, &fprog)) == -1) {
fprintf(stderr, "startSniffer: pcap_setfilter: cannot set filter\n");
exit(1);
}
pcap_freecode(&fprog);
}
}
/* Called at the start on main thread or each time a new file is open on single thread */
void moloch_rules_recompile()
{
int t, r;
if (deadPcap)
pcap_close(deadPcap);
deadPcap = pcap_open_dead(pcapFileHeader.linktype, pcapFileHeader.snaplen);
MolochRule_t *rule;
for (t = 0; t < MOLOCH_RULE_TYPE_NUM; t++) {
for (r = 0; (rule = current.rules[t][r]); r++) {
if (!rule->bpf)
continue;
pcap_freecode(&rule->bpfp);
if (pcapFileHeader.linktype != 239) {
if (pcap_compile(deadPcap, &rule->bpfp, rule->bpf, 1, PCAP_NETMASK_UNKNOWN) == -1) {
LOGEXIT("ERROR - Couldn't compile filter %s: '%s' with %s", rule->filename, rule->bpf, pcap_geterr(deadPcap));
}
} else {
rule->bpfp.bf_len = 0;
}
}
}
}
int set_raw_filter(unsigned int loc_idx, char *filter) {
struct bpf_program raw_filter;
//uint16_t snaplen = 65535;
int linktype;
//struct pcap_t *aa;
int fd = -1;
LERR("APPLY FILTER [%d]\n", loc_idx);
if(loc_idx >= MAX_SOCKETS || sniffer_proto[loc_idx] == NULL) return 0;
fd = pcap_get_selectable_fd(sniffer_proto[loc_idx]);
linktype = profile_socket[loc_idx].link_type ? profile_socket[loc_idx].link_type : DLT_EN10MB;
if (pcap_compile_nopcap(profile_socket[loc_idx].snap_len ? profile_socket[loc_idx].snap_len : 0xffff, linktype, &raw_filter, filter, 1, 0) == -1) {
LERR("Failed to compile filter '%s'", filter);
return -1;
}
#if ( defined (OS_LINUX) || defined (OS_SOLARIS) )
if(setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &raw_filter, sizeof(raw_filter)) < 0 ) {
LERR(" setsockopt filter: [%s] [%d]", strerror(errno), errno);
return -1;
}
#endif
//free(BPF_code);
pcap_freecode( (struct bpf_program *) &raw_filter);
return 1;
}
static int l2_packet_init_libpcap(struct l2_packet_data *l2,
unsigned short protocol)
{
bpf_u_int32 pcap_maskp, pcap_netp;
char pcap_filter[200], pcap_err[PCAP_ERRBUF_SIZE];
struct bpf_program pcap_fp;
pcap_lookupnet(l2->ifname, &pcap_netp, &pcap_maskp, pcap_err);
l2->pcap = pcap_open_live(l2->ifname, 2500, 0, 1, pcap_err);
if (l2->pcap == NULL) {
fprintf(stderr, "pcap_open_live: %s\n", pcap_err);
fprintf(stderr, "ifname='%s'\n", l2->ifname);
return -1;
}
os_snprintf(pcap_filter, sizeof(pcap_filter),
"not ether src " MACSTR " and "
"( ether dst " MACSTR " or ether dst " MACSTR " ) and "
"ether proto 0x%x",
MAC2STR(l2->own_addr), /* do not receive own packets */
MAC2STR(l2->own_addr), MAC2STR(pae_group_addr),
protocol);
if (pcap_compile(l2->pcap, &pcap_fp, pcap_filter, 1, pcap_netp) < 0) {
fprintf(stderr, "pcap_compile: %s\n", pcap_geterr(l2->pcap));
return -1;
}
if (pcap_setfilter(l2->pcap, &pcap_fp) < 0) {
fprintf(stderr, "pcap_setfilter: %s\n", pcap_geterr(l2->pcap));
return -1;
}
pcap_freecode(&pcap_fp);
return 0;
}
/*-
-- cap = cap:set_filter(filter, nooptimize)
- filter is the filter string, see tcpdump or pcap-filter man page.
- nooptimize can be true if you don't want the filter optimized during compile
(the default is to optimize).
*/
static int lpcap_set_filter(lua_State* L)
{
pcap_t* cap = checkpcap(L);
const char* filter = luaL_checkstring(L, 2);
int optimize = !lua_toboolean(L, 3);
bpf_u_int32 netmask = PCAP_NETMASK_UNKNOWN; /* TODO get device from registry, and call pcap_lookup_net()*/
int ret = 0;
struct bpf_program program = { 0 };
ret = pcap_compile(cap, &program, filter, optimize, netmask);
if(ret < 0) {
return pusherr(L, cap);
}
ret = pcap_setfilter(cap, &program);
pcap_freecode(&program);
if(ret < 0) {
return pusherr(L, cap);
}
lua_settop(L, 1);
return 1;
}
void init_pcap(void){
pcap_t * handle; //Handle de capture
struct bpf_program fp;
char * device; //Périphérique pour sniffer
struct devInfo myDevInfo;
char errbuf[PCAP_ERRBUF_SIZE];
int num_packets = 10;
getDevice(&myDevInfo);
#ifdef DEBUG
displayInformationDevice(&myDevInfo); // affiche ip/mask/peripherique
#endif
DEBUGMSG(1)("Ouverture interface");
handle = pcap_open_live(myDevInfo.dev, BUFSIZ, 1, 1000, errbuf);
if (handle == NULL) {
fprintf(stderr, "Couldn't open device %s: %s\n", "eth0", errbuf);
exit(EXIT_FAILURE);
}
DEBUGMSG(1)("compilation du filtre");
if (pcap_compile(handle, &fp, FILTRE, 0, myDevInfo.net) == -1){
fprintf(stderr, "Couldn't parse filter %s: %s\n", FILTRE, pcap_geterr(handle));
exit(EXIT_FAILURE);
}
DEBUGMSG(1)("Activation du filtre");
if (pcap_setfilter(handle, &fp) == -1) {
fprintf(stderr, "Couldn't install filter %s: %s\n", FILTRE, pcap_geterr(handle));
exit(EXIT_FAILURE);
}
DEBUGMSG(1)("Sniffing ... listen packets");
pcap_loop(handle, num_packets, got_packet, NULL);
DEBUGMSG(1)("cleaning and stopping... bye");
pcap_freecode(&fp);
pcap_close(handle);
}
void reader_pfring_start() {
int dlt_to_linktype(int dlt);
pcapFileHeader.linktype = 1;
pcapFileHeader.snaplen = MOLOCH_SNAPLEN;
pcap_t *pcap = pcap_open_dead(pcapFileHeader.linktype, pcapFileHeader.snaplen);
if (config.dontSaveBPFs) {
int i;
if (bpf_programs) {
for (i = 0; i < config.dontSaveBPFsNum; i++) {
pcap_freecode(&bpf_programs[i]);
}
} else {
bpf_programs = malloc(config.dontSaveBPFsNum*sizeof(struct bpf_program));
}
for (i = 0; i < config.dontSaveBPFsNum; i++) {
if (pcap_compile(pcap, &bpf_programs[i], config.dontSaveBPFs[i], 0, PCAP_NETMASK_UNKNOWN) == -1) {
LOG("ERROR - Couldn't compile filter: '%s' with %s", config.dontSaveBPFs[i], pcap_geterr(pcap));
exit(1);
}
}
moloch_reader_should_filter = reader_pfring_should_filter;
}
pcap_close(pcap);
int i;
for (i = 0; i < MAX_INTERFACES && config.interface[i]; i++) {
char name[100];
snprintf(name, sizeof(name), "moloch-pfring%d", i);
g_thread_new(name, &reader_pfring_thread, rings[i]);
}
}
bool us_rawnet_join_multicast( us_rawnet_context_t *self, const uint8_t multicast_mac[6] )
{
bool r = false;
struct bpf_program fcode;
pcap_t *p = (pcap_t *)self->m_pcap;
char filter[1024];
/* TODO: add multicast address to pcap filter here if multicast_mac is not null*/
(void)multicast_mac;
sprintf( filter, "ether proto 0x%04x", self->m_ethertype );
if ( pcap_compile( p, &fcode, filter, 1, 0xffffffff ) < 0 )
{
pcap_close( p );
us_log_error( "Unable to pcap_compile: '%s'", filter );
}
else
{
if ( pcap_setfilter( p, &fcode ) < 0 )
{
pcap_close( p );
us_log_error( "Unable to pcap_setfilter" );
}
else
{
r = true;
}
pcap_freecode( &fcode );
}
return r;
}
void apply_bpf_filters()
{
struct bpf_program bpf_filter;
char *str = "(src host 139.91.70.42 or src host 1.1.1.2) "
"and (dst host 139.91.70.43 or dst host 1.1.1.3) "
"and (dst port 22 or dst port 23)";
printf("Constructing filter : %s\n",str);
if(pcap_compile(p,&bpf_filter,str,1,0xFFFFFF00))
{
pcap_perror(p,"pcap_compile");
exit(1);
}
if(pcap_setfilter(p,&bpf_filter))
{
pcap_perror(p,"pcap_setfilter");
exit(1);
}
pcap_freecode(&bpf_filter);
}
void reader_snf_start() {
pcapFileHeader.linktype = DLT_EN10MB;
pcapFileHeader.snaplen = MOLOCH_SNAPLEN;
pcap_t *dpcap = pcap_open_dead(pcapFileHeader.linktype, pcapFileHeader.snaplen);
int t;
for (t = 0; t < MOLOCH_FILTER_MAX; t++) {
if (config.bpfsNum[t]) {
int i;
if (bpf_programs[t]) {
for (i = 0; i < config.bpfsNum[t]; i++) {
pcap_freecode(&bpf_programs[t][i]);
}
} else {
bpf_programs[t] = malloc(config.bpfsNum[t]*sizeof(struct bpf_program));
}
for (i = 0; i < config.bpfsNum[t]; i++) {
if (pcap_compile(dpcap, &bpf_programs[t][i], config.bpfs[t][i], 1, PCAP_NETMASK_UNKNOWN) == -1) {
LOG("ERROR - Couldn't compile filter: '%s' with %s", config.bpfs[t][i], pcap_geterr(dpcap));
exit(1);
}
}
moloch_reader_should_filter = reader_snf_should_filter;
}
}
int i, r;
for (i = 0; i < MAX_INTERFACES && config.interface[i]; i++) {
for (r = 0; r < snfNumRings; r++) {
char name[100];
snprintf(name, sizeof(name), "moloch-snf%d-%d", i, r);
g_thread_new(name, &reader_snf_thread, rings[i][r]);
}
snf_start(handles[i]);
}
}
/* Find and prepare ethernet device for capturing */
pcap_t *prepare_capture(char *interface, int promisc, char *capfilter) {
char errbuf[PCAP_ERRBUF_SIZE];
pcap_t *pcap_hnd;
char *dev = NULL;
bpf_u_int32 net, mask;
struct bpf_program filter;
/* Starting live capture, so find and open network device */
if (!interface) {
dev = pcap_lookupdev(errbuf);
if (dev == NULL)
LOG_DIE("Cannot find a valid capture device: %s", errbuf);
} else {
dev = interface;
}
if (pcap_lookupnet(dev, &net, &mask, errbuf) == -1) net = 0;
pcap_hnd = pcap_open_live(dev, BUFSIZ, promisc, 0, errbuf);
if (pcap_hnd == NULL)
LOG_DIE("Cannot open live capture on '%s': %s", dev, errbuf);
set_link_header_offset(pcap_datalink(pcap_hnd));
/* Compile capture filter and apply to handle */
if (pcap_compile(pcap_hnd, &filter, capfilter, 0, net) == -1)
LOG_DIE("Cannot compile capture filter '%s': %s", capfilter, pcap_geterr(pcap_hnd));
if (pcap_setfilter(pcap_hnd, &filter) == -1)
LOG_DIE("Cannot apply capture filter: %s", pcap_geterr(pcap_hnd));
pcap_freecode(&filter);
return pcap_hnd;
}
bool Pcap::setBPF(const std::string &filter, std::string *error)
{
std::lock_guard<std::mutex> lock(d->mutex);
if (d->active)
return false;
char err[PCAP_ERRBUF_SIZE] = {'\0'};
pcap_t *pcap = pcap_open_live(d->interface.c_str(), d->snaplen, d->promisc, 500, err);
if (!pcap) {
if (error)
error->assign(err);
return false;
}
pcap_freecode(&d->bpf);
d->bpf.bf_len = 0;
d->bpf.bf_insns = nullptr;
if (pcap_compile(pcap, &d->bpf, filter.c_str(), true, PCAP_NETMASK_UNKNOWN) < 0) {
if (error)
error->assign(pcap_geterr(pcap));
pcap_close(pcap);
return false;
}
pcap_close(pcap);
return true;
}
static int openPcap()
{
char buf[PCAP_ERRBUF_SIZE], *fmt;
struct bpf_program fcode;
if ((hPcap = pcap_open_live(nic, 2048, 1, 1000, buf)) == NULL)
{
// printf("!! 打开网卡%s失败: %s\n", nic, buf);
return -1;
}
fmt = formatHex(localMAC, 6);
#ifndef NO_ARP
sprintf(buf, "((ether proto 0x888e and (ether dst %s or ether dst 01:80:c2:00:00:03)) "
"or ether proto 0x0806) and not ether src %s", fmt, fmt);
#else
sprintf(buf, "ether proto 0x888e and (ether dst %s or ether dst 01:80:c2:00:00:03) "
"and not ether src %s", fmt, fmt);
#endif
if (pcap_compile(hPcap, &fcode, buf, 0, 0xffffffff) == -1
|| pcap_setfilter(hPcap, &fcode) == -1)
{
// printf("!! 设置pcap过滤器失败: %s\n", pcap_geterr(hPcap));
return -1;
}
pcap_freecode(&fcode);
return 0;
}
static int l2_packet_init_libpcap(struct l2_packet_data *l2,
unsigned short protocol)
{
bpf_u_int32 pcap_maskp, pcap_netp;
char pcap_filter[200], pcap_err[PCAP_ERRBUF_SIZE];
struct bpf_program pcap_fp;
pcap_lookupnet(l2->ifname, &pcap_netp, &pcap_maskp, pcap_err);
l2->pcap = pcap_open_live(l2->ifname, 2500, 0, 10, pcap_err);
if (l2->pcap == NULL) {
fprintf(stderr, "pcap_open_live: %s\n", pcap_err);
fprintf(stderr, "ifname='%s'\n", l2->ifname);
return -1;
}
if (pcap_datalink(l2->pcap) != DLT_EN10MB &&
pcap_set_datalink(l2->pcap, DLT_EN10MB) < 0) {
fprintf(stderr, "pcap_set_datalink(DLT_EN10MB): %s\n",
pcap_geterr(l2->pcap));
return -1;
}
os_snprintf(pcap_filter, sizeof(pcap_filter),
"not ether src " MACSTR " and "
"( ether dst " MACSTR " or ether dst " MACSTR " ) and "
"ether proto 0x%x",
MAC2STR(l2->own_addr), /* do not receive own packets */
MAC2STR(l2->own_addr), MAC2STR(pae_group_addr),
protocol);
if (pcap_compile(l2->pcap, &pcap_fp, pcap_filter, 1, pcap_netp) < 0) {
fprintf(stderr, "pcap_compile: %s\n", pcap_geterr(l2->pcap));
return -1;
}
if (pcap_setfilter(l2->pcap, &pcap_fp) < 0) {
fprintf(stderr, "pcap_setfilter: %s\n", pcap_geterr(l2->pcap));
return -1;
}
pcap_freecode(&pcap_fp);
#ifndef __sun__
/*
* When libpcap uses BPF we must enable "immediate mode" to
* receive frames right away; otherwise the system may
* buffer them for us.
*/
{
unsigned int on = 1;
if (ioctl(pcap_fileno(l2->pcap), BIOCIMMEDIATE, &on) < 0) {
fprintf(stderr, "%s: cannot enable immediate mode on "
"interface %s: %s\n",
__func__, l2->ifname, strerror(errno));
/* XXX should we fail? */
}
}
#endif /* __sun__ */
eloop_register_read_sock(pcap_get_selectable_fd(l2->pcap),
l2_packet_receive, l2, l2->pcap);
return 0;
}
struct iface_config *del_iface(struct iface_config *ifc)
{
struct iface_config *next;
int i;
next = ifc->next;
#if HAVE_LIBEVENT2
event_free(ifc->event);
#endif
pcap_freecode(&ifc->pcap_filter);
pcap_close(ifc->pcap_handle);
log_msg(LOG_DEBUG, "Closed interface %s", ifc->name);
if (ifc->cache) {
for (i = 0; i < cfg.hashsize; i++)
if (*(ifc->cache + i))
cache_prune(*(ifc->cache+i), ifc->cache+i);
free(ifc->cache);
}
free(ifc);
return next;
}
void bsf_destroy(bsf_t *bsf_desc)
{
pcap_freecode(bsf_desc->bpf_prog);
free(bsf_desc->bpf_prog);
free(bsf_desc);
return;
}
NetworkInterface::~NetworkInterface()
{
if(m_pFilter)
pcap_freecode(m_pFilter);
if(m_pHandler)
pcap_close(m_pHandler);
}
/*
* Make a copy of a BPF program and put it in the "fcode" member of
* a "pcap_t".
*
* If we fail to allocate memory for the copy, fill in the "errbuf"
* member of the "pcap_t" with an error message, and return -1;
* otherwise, return 0.
*/
int
install_bpf_program(pcap_t *p, struct bpf_program *fp)
{
size_t prog_size;
/*
* Validate the program.
*/
if (!bpf_validate(fp->bf_insns, fp->bf_len)) {
snprintf(p->errbuf, sizeof(p->errbuf),
"BPF program is not valid");
return (-1);
}
/*
* Free up any already installed program.
*/
pcap_freecode(&p->fcode);
prog_size = sizeof(*fp->bf_insns) * fp->bf_len;
p->fcode.bf_len = fp->bf_len;
p->fcode.bf_insns = (struct bpf_insn *)malloc(prog_size);
if (p->fcode.bf_insns == NULL) {
snprintf(p->errbuf, sizeof(p->errbuf),
"malloc: %s", pcap_strerror(errno));
return (-1);
}
memcpy(p->fcode.bf_insns, fp->bf_insns, prog_size);
return (0);
}
static void apply_bpf_filters()
{
struct bpf_program bpf_filters[PORTS_NR];
char str[50];
int i;
for( i = 0 ; i < PORTS_NR ; i++)
{
sprintf(str,"port %u",monitored_ports[i]);
printf("Constructing filter : %s\n",str);
if(pcap_compile(p[i],&bpf_filters[i],str,1,0xFFFFFF00))
{
pcap_perror(p[i],"pcap_compile");
exit(1);
}
}
for( i = 0 ; i < PORTS_NR ; i++)
{
if(pcap_setfilter(p[i],&bpf_filters[i]))
{
pcap_perror(p[i],"pcap_setfilter");
exit(1);
}
}
for( i = 0 ; i < PORTS_NR ; i++)
{
pcap_freecode(&bpf_filters[i]);
}
}
int
pcap_setfilter(pcap_t *p, struct bpf_program *fp)
{
size_t buflen;
/*
* It looks that BPF code generated by gen_protochain() is not
* compatible with some of kernel BPF code (for example BSD/OS 3.1).
* Take a safer side for now.
*/
if (no_optimize || (p->sf.rfile != NULL)){
if (p->fcode.bf_insns != NULL)
pcap_freecode(&p->fcode);
buflen = sizeof(*fp->bf_insns) * fp->bf_len;
p->fcode.bf_len = fp->bf_len;
p->fcode.bf_insns = malloc(buflen);
if (p->fcode.bf_insns == NULL) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "malloc: %s",
pcap_strerror(errno));
return (-1);
}
memcpy(p->fcode.bf_insns, fp->bf_insns, buflen);
} else if (ioctl(p->fd, BIOCSETF, (caddr_t)fp) < 0) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCSETF: %s",
pcap_strerror(errno));
return (-1);
}
return (0);
}
void bpf_try_compile(const char *rulefile, struct sock_fprog *bpf, uint32_t link_type)
{
int i, ret;
const struct bpf_insn *ins;
struct sock_filter *out;
struct bpf_program _bpf;
ret = pcap_compile_nopcap(65535, link_type, &_bpf, rulefile, 1, 0xffffffff);
if (ret < 0)
panic("Cannot compile filter %s\n", rulefile);
bpf->len = _bpf.bf_len;
bpf->filter = xrealloc(bpf->filter, 1, bpf->len * sizeof(*out));
for (i = 0, ins = _bpf.bf_insns, out = bpf->filter; i < bpf->len; ++i, ++ins, ++out) {
out->code = ins->code;
out->jt = ins->jt;
out->jf = ins->jf;
out->k = ins->k;
if (out->code == 0x06 && out->k > 0)
out->k = 0xFFFFFFFF;
}
pcap_freecode(&_bpf);
if (__bpf_validate(bpf) == 0)
panic("This is not a valid BPF program!\n");
}
void
parse_bpf(ipfw_insn **cmd, int *ac, char **av[])
{
struct bpf_program program;
ipfw_insn_bpf *bpf;
int avlen;
NEXT_ARG1;
(*cmd)->opcode = O_LAYER4_BPF;
(*cmd)->module = MODULE_LAYER4_ID;
avlen = strlen(**av);
if (avlen > 256)
errx(EX_DATAERR, "bpf \"%s\" too long (max 256)", **av);
bpf = (ipfw_insn_bpf *)(*cmd);
strcpy(bpf->bf_str, **av);
if (pcap_compile_nopcap(65535, DLT_RAW, &program, **av, 1,
PCAP_NETMASK_UNKNOWN))
errx(EX_DATAERR, "bpf \"%s\" compilation error", **av);
bpf->bf_len = program.bf_len;
memcpy(&bpf->bf_insn, program.bf_insns,
sizeof(struct bpf_insn) * program.bf_len);
(*cmd)->len |= (sizeof(ipfw_insn_bpf) +
sizeof(struct bpf_insn) * (bpf->bf_len - 1)) /
sizeof(uint32_t);
pcap_freecode(&program);
NEXT_ARG1;
}
bool BaseSniffer::set_filter(const std::string &filter) {
bpf_program prog;
if(pcap_compile(handle, &prog, filter.c_str(), 0, mask) == -1)
return false;
bool result = pcap_setfilter(handle, &prog) != -1;
pcap_freecode(&prog);
return result;
}
void stop_capture(int sig)
{
printf("send SIGINT signal to terminate packet capture\n");
//free resources
pcap_freecode(&fp);
pcap_close(handle);
exit(0);
}
void cleanup(void)
{
pcap_freecode(&fp);
pcap_close(handle);
if(buff_frag) free(buff_frag);
free_tags();
}
static void ulink_recv_close(ulink_recv_t *t)
{
pcap_freecode(&t->bpf);
pcap_close(t->pcap_handle);
LOG_("ulink_recv_close: %p", t);
free(t);
return;
}