ForkMaster/zapret
1
0
Fork 0
mirror of https://github.com/bol-van/zapret.git synced 2024-11-14 18:48:33 +05:00
Code Issues Actions Packages Projects Releases Wiki Activity
8b4b8c3fb0
zapret/nfq/nfqws.c
bol-van 8b4b8c3fb0 nfqws,tpws: remove unneeded code
2024-10-31 19:59:26 +03:00

1958 lines
57 KiB
C
Raw Blame History

#define _GNU_SOURCE
#include "nfqws.h"
#include "sec.h"
#include "desync.h"
#include "helpers.h"
#include "checksum.h"
#include "params.h"
#include "protocol.h"
#include "hostlist.h"
#include "ipset.h"
#include "gzip.h"
#include "pools.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#include <stdint.h>
#include <arpa/inet.h>
#include <getopt.h>
#include <fcntl.h>
#include <pwd.h>
#include <signal.h>
#include <errno.h>
#include <time.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <syslog.h>
#ifdef __CYGWIN__
#include "win.h"
#endif
#ifdef __linux__
#include <libnetfilter_queue/libnetfilter_queue.h>
#define NF_DROP 0
#define NF_ACCEPT 1
#endif
#define CTRACK_T_SYN 60
#define CTRACK_T_FIN 60
#define CTRACK_T_EST 300
#define CTRACK_T_UDP 60
#define MAX_CONFIG_FILE_SIZE 16384
struct params_s params;
#ifdef __CYGWIN__
bool bQuit=false;
#endif
static void onhup(int sig)
{
printf("HUP received !\n");
// do not do anything. lists auto reload themselves based on file time.
}
static void onusr1(int sig)
{
printf("\nCONNTRACK DUMP\n");
ConntrackPoolDump(&params.conntrack);
printf("\n");
}
static void onusr2(int sig)
{
printf("\nHOSTFAIL POOL DUMP\n");
struct desync_profile_list *dpl;
LIST_FOREACH(dpl, &params.desync_profiles, next)
{
printf("\nDESYNC PROFILE %d\n",dpl->dp.n);
HostFailPoolDump(dpl->dp.hostlist_auto_fail_counters);
}
printf("\n");
}
static void pre_desync(void)
{
signal(SIGHUP, onhup);
signal(SIGUSR1, onusr1);
signal(SIGUSR2, onusr2);
desync_init();
}
static uint8_t processPacketData(uint32_t *mark, const char *ifout, uint8_t *data_pkt, size_t *len_pkt)
{
#ifdef __linux__
if (*mark & params.desync_fwmark)
{
DLOG("ignoring generated packet\n");
return VERDICT_PASS;
}
#endif
return dpi_desync_packet(*mark, ifout, data_pkt, len_pkt);
}
#ifdef __linux__
static int nfq_cb(struct nfq_q_handle *qh, struct nfgenmsg *nfmsg, struct nfq_data *nfa, void *cookie)
{
int id, ilen;
size_t len;
struct nfqnl_msg_packet_hdr *ph;
uint8_t *data;
uint32_t ifidx;
char ifout[IFNAMSIZ+1];
ph = nfq_get_msg_packet_hdr(nfa);
id = ph ? ntohl(ph->packet_id) : 0;
uint32_t mark = nfq_get_nfmark(nfa);
ilen = nfq_get_payload(nfa, &data);
*ifout=0;
if (params.bind_fix4 || params.bind_fix6)
{
char ifin[IFNAMSIZ+1];
uint32_t ifidx_in;
ifidx = nfq_get_outdev(nfa);
if (ifidx) if_indextoname(ifidx,ifout);
*ifin=0;
ifidx_in = nfq_get_indev(nfa);
if (ifidx_in) if_indextoname(ifidx_in,ifin);
DLOG("packet: id=%d len=%d mark=%08X ifin=%s(%u) ifout=%s(%u)\n", id, ilen, mark, ifin, ifidx_in, ifout, ifidx);
}
else
// save some syscalls
DLOG("packet: id=%d len=%d mark=%08X\n", id, ilen, mark);
if (ilen >= 0)
{
len = ilen;
uint8_t verdict = processPacketData(&mark, ifout, data, &len);
switch(verdict & VERDICT_MASK)
{
case VERDICT_MODIFY:
DLOG("packet: id=%d pass modified. len=%zu\n", id, len);
return nfq_set_verdict2(qh, id, NF_ACCEPT, mark, (uint32_t)len, data);
case VERDICT_DROP:
DLOG("packet: id=%d drop\n", id);
return nfq_set_verdict2(qh, id, NF_DROP, mark, 0, NULL);
}
}
DLOG("packet: id=%d pass unmodified\n", id);
return nfq_set_verdict2(qh, id, NF_ACCEPT, mark, 0, NULL);
}
static int nfq_main(void)
{
struct nfq_handle *h = NULL;
struct nfq_q_handle *qh = NULL;
int fd,rv;
uint8_t buf[16384] __attribute__((aligned));
DLOG_CONDUP("opening library handle\n");
h = nfq_open();
if (!h) {
DLOG_PERROR("nfq_open()");
goto exiterr;
}
DLOG_CONDUP("unbinding existing nf_queue handler for AF_INET (if any)\n");
if (nfq_unbind_pf(h, AF_INET) < 0) {
DLOG_PERROR("nfq_unbind_pf()");
goto exiterr;
}
DLOG_CONDUP("binding nfnetlink_queue as nf_queue handler for AF_INET\n");
if (nfq_bind_pf(h, AF_INET) < 0) {
DLOG_PERROR("nfq_bind_pf()");
goto exiterr;
}
DLOG_CONDUP("binding this socket to queue '%u'\n", params.qnum);
qh = nfq_create_queue(h, params.qnum, &nfq_cb, &params);
if (!qh) {
DLOG_PERROR("nfq_create_queue()");
goto exiterr;
}
DLOG_CONDUP("setting copy_packet mode\n");
if (nfq_set_mode(qh, NFQNL_COPY_PACKET, 0xffff) < 0) {
DLOG_PERROR("can't set packet_copy mode");
goto exiterr;
}
if (nfq_set_queue_maxlen(qh, Q_MAXLEN) < 0) {
DLOG_PERROR("can't set queue maxlen");
goto exiterr;
}
// accept packets if they cant be handled
if (nfq_set_queue_flags(qh, NFQA_CFG_F_FAIL_OPEN , NFQA_CFG_F_FAIL_OPEN))
{
DLOG_ERR("can't set queue flags. its OK on linux <3.6\n");
// dot not fail. not supported on old linuxes <3.6
}
DLOG_CONDUP("initializing raw sockets bind-fix4=%u bind-fix6=%u\n",params.bind_fix4,params.bind_fix6);
if (!rawsend_preinit(params.bind_fix4,params.bind_fix6))
goto exiterr;
#ifndef __CYGWIN__
sec_harden();
if (params.droproot && !droproot(params.uid, params.gid))
goto exiterr;
print_id();
#endif
pre_desync();
fd = nfq_fd(h);
// increase socket buffer size. on slow systems reloading hostlist can take a while.
// if too many unhandled packets are received its possible to get "no buffer space available" error
if (!set_socket_buffers(fd,Q_RCVBUF/2,Q_SNDBUF/2))
goto exiterr;
do
{
while ((rv = recv(fd, buf, sizeof(buf), 0)) > 0)
{
int r = nfq_handle_packet(h, (char *)buf, rv);
if (r) DLOG_ERR("nfq_handle_packet error %d\n", r);
}
DLOG_ERR("recv: errno %d\n",errno);
DLOG_PERROR("recv");
// do not fail on ENOBUFS
} while(errno==ENOBUFS);
DLOG_CONDUP("unbinding from queue %u\n", params.qnum);
nfq_destroy_queue(qh);
#ifdef INSANE
/* normally, applications SHOULD NOT issue this command, since
* it detaches other programs/sockets from AF_INET, too ! */
DLOG_CONDUP("unbinding from AF_INET\n");
nfq_unbind_pf(h, AF_INET);
#endif
DLOG_CONDUP("closing library handle\n");
nfq_close(h);
return 0;
exiterr:
if (qh) nfq_destroy_queue(qh);
if (h) nfq_close(h);
return 1;
}
#elif defined(BSD)
static int dvt_main(void)
{
uint8_t buf[16384] __attribute__((aligned));
struct sockaddr_storage sa_from;
int fd[2] = {-1,-1}; // 4,6
int i,r,res=1,fdct=1,fdmax;
unsigned int id=0;
socklen_t socklen;
ssize_t rd,wr;
fd_set fdset;
{
struct sockaddr_in bp4;
bp4.sin_family = AF_INET;
bp4.sin_port = htons(params.port);
bp4.sin_addr.s_addr = INADDR_ANY;
DLOG_CONDUP("creating divert4 socket\n");
fd[0] = socket_divert(AF_INET);
if (fd[0] == -1) {
DLOG_PERROR("socket (DIVERT4)");
goto exiterr;
}
DLOG_CONDUP("binding divert4 socket\n");
if (bind(fd[0], (struct sockaddr*)&bp4, sizeof(bp4)) < 0)
{
DLOG_PERROR("bind (DIVERT4)");
goto exiterr;
}
if (!set_socket_buffers(fd[0],Q_RCVBUF,Q_SNDBUF))
goto exiterr;
}
#ifdef __OpenBSD__
{
// in OpenBSD must use separate divert sockets for ipv4 and ipv6
struct sockaddr_in6 bp6;
memset(&bp6,0,sizeof(bp6));
bp6.sin6_family = AF_INET6;
bp6.sin6_port = htons(params.port);
DLOG_CONDUP("creating divert6 socket\n");
fd[1] = socket_divert(AF_INET6);
if (fd[1] == -1) {
DLOG_PERROR("socket (DIVERT6)");
goto exiterr;
}
DLOG_CONDUP("binding divert6 socket\n");
if (bind(fd[1], (struct sockaddr*)&bp6, sizeof(bp6)) < 0)
{
DLOG_PERROR("bind (DIVERT6)");
goto exiterr;
}
fdct++;
if (!set_socket_buffers(fd[1],Q_RCVBUF,Q_SNDBUF))
goto exiterr;
}
#endif
fdmax = (fd[0]>fd[1] ? fd[0] : fd[1]) + 1;
DLOG_CONDUP("initializing raw sockets\n");
if (!rawsend_preinit(false,false))
goto exiterr;
if (params.droproot && !droproot(params.uid, params.gid))
goto exiterr;
print_id();
pre_desync();
for(;;)
{
FD_ZERO(&fdset);
for(i=0;i<fdct;i++) FD_SET(fd[i], &fdset);
r = select(fdmax,&fdset,NULL,NULL,NULL);
if (r==-1)
{
if (errno==EINTR)
{
// a signal received
continue;
}
DLOG_PERROR("select");
goto exiterr;
}
for(i=0;i<fdct;i++)
{
if (FD_ISSET(fd[i], &fdset))
{
socklen = sizeof(sa_from);
rd = recvfrom(fd[i], buf, sizeof(buf), 0, (struct sockaddr*)&sa_from, &socklen);
if (rd<0)
{
DLOG_PERROR("recvfrom");
goto exiterr;
}
else if (rd>0)
{
uint32_t mark=0;
uint8_t verdict;
size_t len = rd;
DLOG("packet: id=%u len=%zu\n", id, len);
verdict = processPacketData(&mark, NULL, buf, &len);
switch (verdict & VERDICT_MASK)
{
case VERDICT_PASS:
case VERDICT_MODIFY:
if ((verdict & VERDICT_MASK)==VERDICT_PASS)
DLOG("packet: id=%u reinject unmodified\n", id);
else
DLOG("packet: id=%u reinject modified len=%zu\n", id, len);
wr = sendto(fd[i], buf, len, 0, (struct sockaddr*)&sa_from, socklen);
if (wr<0)
DLOG_PERROR("reinject sendto");
else if (wr!=len)
DLOG_ERR("reinject sendto: not all data was reinjected. received %zu, sent %zd\n", len, wr);
break;
default:
DLOG("packet: id=%u drop\n", id);
}
id++;
}
else
{
DLOG("unexpected zero size recvfrom\n");
}
}
}
}
res=0;
exiterr:
if (fd[0]!=-1) close(fd[0]);
if (fd[1]!=-1) close(fd[1]);
return res;
}
#elif defined (__CYGWIN__)
static int win_main(const char *windivert_filter)
{
size_t len;
unsigned int id;
uint8_t verdict;
bool bOutbound;
uint8_t packet[16384];
uint32_t mark;
WINDIVERT_ADDRESS wa;
char ifout[22];
pre_desync();
if (!win_dark_init(&params.ssid_filter, &params.nlm_filter))
{
DLOG_ERR("win_dark_init failed. win32 error %u (0x%08X)\n", w_win32_error, w_win32_error);
return w_win32_error;
}
for(;;)
{
if (!logical_net_filter_match())
{
DLOG_CONDUP("logical network is not present. waiting it to appear.\n");
fflush(stdout);
do
{
if (bQuit)
{
DLOG("QUIT requested\n");
win_dark_deinit();
return 0;
}
usleep(500000);
}
while (!logical_net_filter_match());
DLOG_CONDUP("logical network now present\n");
fflush(stdout);
}
if (!windivert_init(windivert_filter))
{
win_dark_deinit();
return w_win32_error;
}
DLOG_CONDUP("windivert initialized. capture is started.\n");
// cygwin auto flush fails when piping
fflush(stdout);
fflush(stderr);
for (id=0;;id++)
{
len = sizeof(packet);
if (!windivert_recv(packet, &len, &wa))
{
if (errno==ENOBUFS)
{
DLOG("windivert: ignoring too large packet\n");
continue; // too large packet
}
else if (errno==ENODEV)
{
DLOG_CONDUP("logical network disappeared. deinitializing windivert.\n");
rawsend_cleanup();
break;
}
else if (errno==EINTR)
{
DLOG("QUIT requested\n");
win_dark_deinit();
return 0;
}
DLOG_ERR("windivert: recv failed. errno %d\n", errno);
win_dark_deinit();
return w_win32_error;
}
*ifout=0;
if (wa.Outbound) snprintf(ifout,sizeof(ifout),"%u.%u", wa.Network.IfIdx, wa.Network.SubIfIdx);
DLOG("packet: id=%u len=%zu %s IPv6=%u IPChecksum=%u TCPChecksum=%u UDPChecksum=%u IfIdx=%u.%u\n", id, len, wa.Outbound ? "outbound" : "inbound", wa.IPv6, wa.IPChecksum, wa.TCPChecksum, wa.UDPChecksum, wa.Network.IfIdx, wa.Network.SubIfIdx);
if (wa.Impostor)
{
DLOG("windivert: passing impostor packet\n");
verdict = VERDICT_PASS;
}
else if (wa.Loopback)
{
DLOG("windivert: passing loopback packet\n");
verdict = VERDICT_PASS;
}
else
{
mark=0;
// pseudo interface id IfIdx.SubIfIdx
verdict = processPacketData(&mark, ifout, packet, &len);
}
switch (verdict & VERDICT_MASK)
{
case VERDICT_PASS:
case VERDICT_MODIFY:
if ((verdict & VERDICT_MASK)==VERDICT_PASS)
DLOG("packet: id=%u reinject unmodified\n", id);
else
DLOG("packet: id=%u reinject modified len=%zu\n", id, len);
if (!windivert_send(packet, len, &wa))
DLOG_ERR("windivert: reinject of packet id=%u failed\n", id);
break;
default:
DLOG("packet: id=%u drop\n", id);
}
// cygwin auto flush fails when piping
fflush(stdout);
fflush(stderr);
}
}
win_dark_deinit();
return 0;
}
#endif // multiple OS divert handlers
static bool parse_ws_scale_factor(char *s, uint16_t *wsize, uint8_t *wscale)
{
int v;
char *p;
if ((p = strchr(s,':'))) *p++=0;
v = atoi(s);
if (v < 0 || v>65535)
{
DLOG_ERR("bad wsize\n");
return false;
}
*wsize=(uint16_t)v;
if (p && *p)
{
v = atoi(p);
if (v < 0 || v>255)
{
DLOG_ERR("bad wscale\n");
return false;
}
*wscale = (uint8_t)v;
}
return true;
}
static void cleanup_args()
{
wordfree(&params.wexp);
}
static void cleanup_params(void)
{
cleanup_args();
ConntrackPoolDestroy(&params.conntrack);
dp_list_destroy(&params.desync_profiles);
hostlist_files_destroy(&params.hostlists);
ipset_files_destroy(&params.ipsets);
#ifdef __CYGWIN__
strlist_destroy(&params.ssid_filter);
strlist_destroy(&params.nlm_filter);
#endif
}
static void exit_clean(int code)
{
cleanup_params();
exit(code);
}
static bool parse_cutoff(const char *opt, unsigned int *value, char *mode)
{
*mode = (*opt=='n' || *opt=='d' || *opt=='s') ? *opt++ : 'n';
return sscanf(opt, "%u", value)>0;
}
static bool parse_badseq_increment(const char *opt, uint32_t *value)
{
if (((opt[0]=='0' && opt[1]=='x') || (opt[0]=='-' && opt[1]=='0' && opt[2]=='x')) && sscanf(opt+2+(opt[0]=='-'), "%X", (int32_t*)value)>0)
{
if (opt[0]=='-') *value = -*value;
return true;
}
else
{
return sscanf(opt, "%d", (int32_t*)value)>0;
}
}
static void load_file_or_exit(const char *filename, void *buf, size_t *size)
{
if (filename[0]=='0' && filename[1]=='x')
{
if (!parse_hex_str(filename+2,buf,size) || !*size)
{
DLOG_ERR("invalid hex string: %s\n",filename+2);
exit_clean(1);
}
DLOG("read %zu bytes from hex string\n",*size);
}
else
{
if (!load_file_nonempty(filename,buf,size))
{
DLOG_ERR("could not read %s\n",filename);
exit_clean(1);
}
DLOG("read %zu bytes from %s\n",*size,filename);
}
}
static bool parse_autottl(const char *s, autottl *t)
{
unsigned int delta,min,max;
AUTOTTL_SET_DEFAULT(*t);
if (s)
{
max = t->max;
switch (sscanf(s,"%u:%u-%u",&delta,&min,&max))
{
case 3:
if ((delta && !max) || max>255) return false;
t->max=(uint8_t)max;
case 2:
if ((delta && !min) || min>255 || min>max) return false;
t->min=(uint8_t)min;
case 1:
if (delta>255) return false;
t->delta=(uint8_t)delta;
break;
default:
return false;
}
}
return true;
}
static bool parse_l7_list(char *opt, uint32_t *l7)
{
char *e,*p,c;
for (p=opt,*l7=0 ; p ; )
{
if ((e = strchr(p,',')))
{
c=*e;
*e=0;
}
if (!strcmp(p,"http"))
*l7 |= L7_PROTO_HTTP;
else if (!strcmp(p,"tls"))
*l7 |= L7_PROTO_TLS;
else if (!strcmp(p,"quic"))
*l7 |= L7_PROTO_QUIC;
else if (!strcmp(p,"wireguard"))
*l7 |= L7_PROTO_WIREGUARD;
else if (!strcmp(p,"dht"))
*l7 |= L7_PROTO_DHT;
else if (!strcmp(p,"unknown"))
*l7 |= L7_PROTO_UNKNOWN;
else return false;
if (e)
{
*e++=c;
}
p = e;
}
return true;
}
static bool parse_pf_list(char *opt, struct port_filters_head *pfl)
{
char *e,*p,c;
port_filter pf;
bool b;
for (p=opt ; p ; )
{
if ((e = strchr(p,',')))
{
c=*e;
*e=0;
}
b = pf_parse(p,&pf) && port_filter_add(pfl,&pf);
if (e) *e++=c;
if (!b) return false;
p = e;
}
return true;
}
static bool wf_make_l3(char *opt, bool *ipv4, bool *ipv6)
{
char *e,*p,c;
for (p=opt,*ipv4=*ipv6=false ; p ; )
{
if ((e = strchr(p,',')))
{
c=*e;
*e=0;
}
if (!strcmp(p,"ipv4"))
*ipv4 = true;
else if (!strcmp(p,"ipv6"))
*ipv6 = true;
else return false;
if (e)
{
*e++=c;
}
p = e;
}
return true;
}
#ifdef __CYGWIN__
static bool wf_make_pf(char *opt, const char *l4, const char *portname, char *buf, size_t len)
{
char *e,*p,c,s1[64];
port_filter pf;
int n;
if (len<3) return false;
for (n=0,p=opt,*buf='(',buf[1]=0 ; p ; n++)
{
if ((e = strchr(p,',')))
{
c=*e;
*e=0;
}
if (!pf_parse(p,&pf)) return false;
if (pf.from==pf.to)
snprintf(s1, sizeof(s1), "(%s.%s %s %u)", l4, portname, pf.neg ? "!=" : "==", pf.from);
else
snprintf(s1, sizeof(s1), "(%s.%s %s %u %s %s.%s %s %u)", l4, portname, pf.neg ? "<" : ">=", pf.from, pf.neg ? "or" : "and" , l4, portname, pf.neg ? ">" : "<=", pf.to);
if (n) strncat(buf," or ",len-strlen(buf)-1);
strncat(buf, s1, len-strlen(buf)-1);
if (e)
{
*e++=c;
}
p = e;
}
strncat(buf, ")", len-strlen(buf)-1);
return true;
}
#define DIVERT_NO_LOCALNETSv4_DST "(" \
"(ip.DstAddr < 127.0.0.1 or ip.DstAddr > 127.255.255.255) and " \
"(ip.DstAddr < 10.0.0.0 or ip.DstAddr > 10.255.255.255) and " \
"(ip.DstAddr < 192.168.0.0 or ip.DstAddr > 192.168.255.255) and " \
"(ip.DstAddr < 172.16.0.0 or ip.DstAddr > 172.31.255.255) and " \
"(ip.DstAddr < 169.254.0.0 or ip.DstAddr > 169.254.255.255))"
#define DIVERT_NO_LOCALNETSv4_SRC "(" \
"(ip.SrcAddr < 127.0.0.1 or ip.SrcAddr > 127.255.255.255) and " \
"(ip.SrcAddr < 10.0.0.0 or ip.SrcAddr > 10.255.255.255) and " \
"(ip.SrcAddr < 192.168.0.0 or ip.SrcAddr > 192.168.255.255) and " \
"(ip.SrcAddr < 172.16.0.0 or ip.SrcAddr > 172.31.255.255) and " \
"(ip.SrcAddr < 169.254.0.0 or ip.SrcAddr > 169.254.255.255))"
#define DIVERT_NO_LOCALNETSv6_DST "(" \
"(ipv6.DstAddr > ::1) and " \
"(ipv6.DstAddr < 2001::0 or ipv6.DstAddr >= 2001:1::0) and " \
"(ipv6.DstAddr < fc00::0 or ipv6.DstAddr >= fe00::0) and " \
"(ipv6.DstAddr < fe80::0 or ipv6.DstAddr >= fec0::0) and " \
"(ipv6.DstAddr < ff00::0 or ipv6.DstAddr >= ffff::0))"
#define DIVERT_NO_LOCALNETSv6_SRC "(" \
"(ipv6.SrcAddr > ::1) and " \
"(ipv6.SrcAddr < 2001::0 or ipv6.SrcAddr >= 2001:1::0) and " \
"(ipv6.SrcAddr < fc00::0 or ipv6.SrcAddr >= fe00::0) and " \
"(ipv6.SrcAddr < fe80::0 or ipv6.SrcAddr >= fec0::0) and " \
"(ipv6.SrcAddr < ff00::0 or ipv6.SrcAddr >= ffff::0))"
#define DIVERT_NO_LOCALNETS_SRC "(" DIVERT_NO_LOCALNETSv4_SRC " or " DIVERT_NO_LOCALNETSv6_SRC ")"
#define DIVERT_NO_LOCALNETS_DST "(" DIVERT_NO_LOCALNETSv4_DST " or " DIVERT_NO_LOCALNETSv6_DST ")"
#define DIVERT_TCP_INBOUNDS "(tcp.Ack and tcp.Syn or tcp.Rst or tcp.Fin)"
// HTTP/1.? 30(2|7)
#define DIVERT_HTTP_REDIRECT "tcp.PayloadLength>=12 and tcp.Payload32[0]==0x48545450 and tcp.Payload16[2]==0x2F31 and tcp.Payload[6]==0x2E and tcp.Payload16[4]==0x2033 and tcp.Payload[10]==0x30 and (tcp.Payload[11]==0x32 or tcp.Payload[11]==0x37)"
#define DIVERT_PROLOG "!impostor and !loopback"
static bool wf_make_filter(
char *wf, size_t len,
unsigned int IfIdx,unsigned int SubIfIdx,
bool ipv4, bool ipv6,
const char *pf_tcp_src, const char *pf_tcp_dst,
const char *pf_udp_src, const char *pf_udp_dst)
{
char pf_dst_buf[512],iface[64];
const char *pf_dst;
const char *f_tcpin = *pf_tcp_src ? dp_list_have_autohostlist(&params.desync_profiles) ? "(" DIVERT_TCP_INBOUNDS " or (" DIVERT_HTTP_REDIRECT "))" : DIVERT_TCP_INBOUNDS : "";
snprintf(iface,sizeof(iface)," ifIdx=%u and subIfIdx=%u and",IfIdx,SubIfIdx);
if (!*pf_tcp_src && !*pf_udp_src) return false;
if (*pf_tcp_src && *pf_udp_src)
{
snprintf(pf_dst_buf,sizeof(pf_dst_buf),"(%s or %s)",pf_tcp_dst,pf_udp_dst);
pf_dst = pf_dst_buf;
}
else
pf_dst = *pf_tcp_dst ? pf_tcp_dst : pf_udp_dst;
snprintf(wf,len,
DIVERT_PROLOG " and%s%s\n ((outbound and %s%s)\n or\n (inbound and tcp%s%s%s%s%s%s%s))",
IfIdx ? iface : "",
ipv4 ? ipv6 ? "" : " ip and" : " ipv6 and",
pf_dst,
ipv4 ? ipv6 ? " and " DIVERT_NO_LOCALNETS_DST : " and " DIVERT_NO_LOCALNETSv4_DST : " and " DIVERT_NO_LOCALNETSv6_DST,
*pf_tcp_src ? "" : " and false",
*f_tcpin ? " and " : "",
*f_tcpin ? f_tcpin : "",
*pf_tcp_src ? " and " : "",
*pf_tcp_src ? pf_tcp_src : "",
*pf_tcp_src ? " and " : "",
*pf_tcp_src ? ipv4 ? ipv6 ? DIVERT_NO_LOCALNETS_SRC : DIVERT_NO_LOCALNETSv4_SRC : DIVERT_NO_LOCALNETSv6_SRC : ""
);
return true;
}
static unsigned int hash_jen(const void *data,unsigned int len)
{
unsigned int hash;
HASH_JEN(data,len,hash);
return hash;
}
#endif
static void exithelp(void)
{
printf(
" @<config_file>\t\t\t\t\t; read file for options. must be the only argument. other options are ignored.\n\n"
" --debug=0|1|syslog|@<filename>\n"
#ifdef __linux__
" --qnum=<nfqueue_number>\n"
#elif defined(BSD)
" --port=<port>\t\t\t\t\t; divert port\n"
#endif
" --daemon\t\t\t\t\t; daemonize\n"
" --pidfile=<filename>\t\t\t\t; write pid to file\n"
#ifndef __CYGWIN__
" --user=<username>\t\t\t\t; drop root privs\n"
" --uid=uid[:gid]\t\t\t\t; drop root privs\n"
#endif
#ifdef __linux__
" --bind-fix4\t\t\t\t\t; apply outgoing interface selection fix for generated ipv4 packets\n"
" --bind-fix6\t\t\t\t\t; apply outgoing interface selection fix for generated ipv6 packets\n"
#endif
" --ctrack-timeouts=S:E:F[:U]\t\t\t; internal conntrack timeouts for TCP SYN, ESTABLISHED, FIN stages, UDP timeout. default %u:%u:%u:%u\n"
#ifdef __CYGWIN__
"\nWINDIVERT FILTER:\n"
" --wf-iface=<int>[.<int>]\t\t\t; numeric network interface and subinterface indexes\n"
" --wf-l3=ipv4|ipv6\t\t\t\t; L3 protocol filter. multiple comma separated values allowed.\n"
" --wf-tcp=[~]port1[-port2]\t\t\t; TCP port filter. ~ means negation. multiple comma separated values allowed.\n"
" --wf-udp=[~]port1[-port2]\t\t\t; UDP port filter. ~ means negation. multiple comma separated values allowed.\n"
" --wf-raw=<filter>|@<filename>\t\t\t; raw windivert filter string or filename\n"
" --wf-save=<filename>\t\t\t\t; save windivert filter string to a file and exit\n"
"\nLOGICAL NETWORK FILTER:\n"
" --ssid-filter=ssid1[,ssid2,ssid3,...]\t\t; enable winws only if any of specified wifi SSIDs connected\n"
" --nlm-filter=net1[,net2,net3,...]\t\t; enable winws only if any of specified NLM network is connected. names and GUIDs are accepted.\n"
" --nlm-list[=all]\t\t\t\t; list Network List Manager (NLM) networks. connected only or all.\n"
#endif
"\nMULTI-STRATEGY:\n"
" --new\t\t\t\t\t\t; begin new strategy\n"
" --filter-l3=ipv4|ipv6\t\t\t\t; L3 protocol filter. multiple comma separated values allowed.\n"
" --filter-tcp=[~]port1[-port2]|*\t\t; TCP port filter. ~ means negation. setting tcp and not setting udp filter denies udp. comma separated list allowed.\n"
" --filter-udp=[~]port1[-port2]|*\t\t; UDP port filter. ~ means negation. setting udp and not setting tcp filter denies tcp. comma separated list allowed.\n"
" --filter-l7=[http|tls|quic|wireguard|dht|unknown] ; L6-L7 protocol filter. multiple comma separated values allowed.\n"
" --ipset=<filename>\t\t\t\t; ipset include filter (one ip/CIDR per line, ipv4 and ipv6 accepted, gzip supported, multiple ipsets allowed)\n"
" --ipset-exclude=<filename>\t\t\t; ipset exclude filter (one ip/CIDR per line, ipv4 and ipv6 accepted, gzip supported, multiple ipsets allowed)\n"
"\nHOSTLIST FILTER:\n"
" --hostlist=<filename>\t\t\t\t; apply dpi desync only to the listed hosts (one host per line, subdomains auto apply, gzip supported, multiple hostlists allowed)\n"
" --hostlist-exclude=<filename>\t\t\t; do not apply dpi desync to the listed hosts (one host per line, subdomains auto apply, gzip supported, multiple hostlists allowed)\n"
" --hostlist-auto=<filename>\t\t\t; detect DPI blocks and build hostlist automatically\n"
" --hostlist-auto-fail-threshold=<int>\t\t; how many failed attempts cause hostname to be added to auto hostlist (default : %d)\n"
" --hostlist-auto-fail-time=<int>\t\t; all failed attemps must be within these seconds (default : %d)\n"
" --hostlist-auto-retrans-threshold=<int>\t; how many request retransmissions cause attempt to fail (default : %d)\n"
" --hostlist-auto-debug=<logfile>\t\t; debug auto hostlist positives\n"
"\nTAMPER:\n"
" --wsize=<window_size>[:<scale_factor>]\t\t; set window size. 0 = do not modify. OBSOLETE !\n"
" --wssize=<window_size>[:<scale_factor>]\t; set window size for server. 0 = do not modify. default scale_factor = 0.\n"
" --wssize-cutoff=[n|d|s]N\t\t\t; apply server wsize only to packet numbers (n, default), data packet numbers (d), relative sequence (s) less than N\n"
" --hostcase\t\t\t\t\t; change Host: => host:\n"
" --hostspell\t\t\t\t\t; exact spelling of \"Host\" header. must be 4 chars. default is \"host\"\n"
" --hostnospace\t\t\t\t\t; remove space after Host: and add it to User-Agent: to preserve packet size\n"
" --domcase\t\t\t\t\t; mix domain case : Host: TeSt.cOm\n"
" --dpi-desync=[<mode0>,]<mode>[,<mode2>]\t; try to desync dpi state. modes : synack syndata fake fakeknown rst rstack hopbyhop destopt ipfrag1 disorder disorder2 split split2 ipfrag2 udplen tamper\n"
#ifdef __linux__
" --dpi-desync-fwmark=<int|0xHEX>\t\t; override fwmark for desync packet. default = 0x%08X (%u)\n"
#elif defined(SO_USER_COOKIE)
" --dpi-desync-sockarg=<int|0xHEX>\t\t; override sockarg (SO_USER_COOKIE) for desync packet. default = 0x%08X (%u)\n"
#endif
" --dpi-desync-ttl=<int>\t\t\t\t; set ttl for desync packet\n"
" --dpi-desync-ttl6=<int>\t\t\t; set ipv6 hop limit for desync packet. by default ttl value is used.\n"
" --dpi-desync-autottl=[<delta>[:<min>[-<max>]]]\t; auto ttl mode for both ipv4 and ipv6. default: %u:%u-%u\n"
" --dpi-desync-autottl6=[<delta>[:<min>[-<max>]]] ; overrides --dpi-desync-autottl for ipv6 only\n"
" --dpi-desync-fooling=<mode>[,<mode>]\t\t; can use multiple comma separated values. modes : none md5sig ts badseq badsum datanoack hopbyhop hopbyhop2\n"
" --dpi-desync-repeats=<N>\t\t\t; send every desync packet N times\n"
" --dpi-desync-skip-nosni=0|1\t\t\t; 1(default)=do not act on ClientHello without SNI (ESNI ?)\n"
" --dpi-desync-split-pos=<1..%u>\t\t; data payload split position\n"
" --dpi-desync-split-http-req=method|host\t; split at specified logical part of plain http request\n"
" --dpi-desync-split-tls=sni|sniext\t\t; split at specified logical part of TLS ClientHello\n"
" --dpi-desync-split-seqovl=<int>\t\t; use sequence overlap before first sent original split segment\n"
" --dpi-desync-split-seqovl-pattern=<filename>|0xHEX ; pattern for the fake part of overlap\n"
" --dpi-desync-ipfrag-pos-tcp=<8..%u>\t\t; ip frag position starting from the transport header. multiple of 8, default %u.\n"
" --dpi-desync-ipfrag-pos-udp=<8..%u>\t\t; ip frag position starting from the transport header. multiple of 8, default %u.\n"
" --dpi-desync-badseq-increment=<int|0xHEX>\t; badseq fooling seq signed increment. default %d\n"
" --dpi-desync-badack-increment=<int|0xHEX>\t; badseq fooling ackseq signed increment. default %d\n"
" --dpi-desync-any-protocol=0|1\t\t\t; 0(default)=desync only http and tls 1=desync any nonempty data packet\n"
" --dpi-desync-fake-http=<filename>|0xHEX\t; file containing fake http request\n"
" --dpi-desync-fake-tls=<filename>|0xHEX\t\t; file containing fake TLS ClientHello (for https)\n"
" --dpi-desync-fake-unknown=<filename>|0xHEX\t; file containing unknown protocol fake payload\n"
" --dpi-desync-fake-syndata=<filename>|0xHEX\t; file containing SYN data payload\n"
" --dpi-desync-fake-quic=<filename>|0xHEX\t; file containing fake QUIC Initial\n"
" --dpi-desync-fake-wireguard=<filename>|0xHEX\t; file containing fake wireguard handshake initiation\n"
" --dpi-desync-fake-dht=<filename>|0xHEX\t\t; file containing DHT protocol fake payload (d1...e)\n"
" --dpi-desync-fake-unknown-udp=<filename>|0xHEX\t; file containing unknown udp protocol fake payload\n"
" --dpi-desync-udplen-increment=<int>\t\t; increase or decrease udp packet length by N bytes (default %u). negative values decrease length.\n"
" --dpi-desync-udplen-pattern=<filename>|0xHEX\t; udp tail fill pattern\n"
" --dpi-desync-start=[n|d|s]N\t\t\t; apply dpi desync only to packet numbers (n, default), data packet numbers (d), relative sequence (s) greater or equal than N\n"
" --dpi-desync-cutoff=[n|d|s]N\t\t\t; apply dpi desync only to packet numbers (n, default), data packet numbers (d), relative sequence (s) less than N\n",
CTRACK_T_SYN, CTRACK_T_EST, CTRACK_T_FIN, CTRACK_T_UDP,
HOSTLIST_AUTO_FAIL_THRESHOLD_DEFAULT, HOSTLIST_AUTO_FAIL_TIME_DEFAULT, HOSTLIST_AUTO_RETRANS_THRESHOLD_DEFAULT,
#if defined(__linux__) || defined(SO_USER_COOKIE)
DPI_DESYNC_FWMARK_DEFAULT,DPI_DESYNC_FWMARK_DEFAULT,
#endif
AUTOTTL_DEFAULT_DELTA,AUTOTTL_DEFAULT_MIN,AUTOTTL_DEFAULT_MAX,
DPI_DESYNC_MAX_FAKE_LEN,
DPI_DESYNC_MAX_FAKE_LEN, IPFRAG_UDP_DEFAULT,
DPI_DESYNC_MAX_FAKE_LEN, IPFRAG_TCP_DEFAULT,
BADSEQ_INCREMENT_DEFAULT, BADSEQ_ACK_INCREMENT_DEFAULT,
UDPLEN_INCREMENT_DEFAULT
);
exit(1);
}
static void exithelp_clean(void)
{
cleanup_params();
exithelp();
}
bool parse_httpreqpos(const char *s, enum httpreqpos *pos)
{
if (!strcmp(s, "method"))
*pos = httpreqpos_method;
else if (!strcmp(s, "host"))
*pos = httpreqpos_host;
else
return false;
return true;
}
bool parse_tlspos(const char *s, enum tlspos *pos)
{
if (!strcmp(s, "sni"))
*pos = tlspos_sni;
else if (!strcmp(s, "sniext"))
*pos = tlspos_sniext;
else
return false;
return true;
}
int main(int argc, char **argv)
{
#ifdef __CYGWIN__
if (service_run(argc, argv))
{
// we were running as service. now exit.
return 0;
}
#endif
int result, v;
int option_index = 0;
bool daemon = false;
char pidfile[256];
#ifdef __CYGWIN__
char windivert_filter[8192], wf_pf_tcp_src[256], wf_pf_tcp_dst[256], wf_pf_udp_src[256], wf_pf_udp_dst[256], wf_save_file[256];
bool wf_ipv4=true, wf_ipv6=true;
unsigned int IfIdx=0, SubIfIdx=0;
unsigned int hash_wf_tcp=0,hash_wf_udp=0,hash_wf_raw=0,hash_ssid_filter=0,hash_nlm_filter=0;
*windivert_filter = *wf_pf_tcp_src = *wf_pf_tcp_dst = *wf_pf_udp_src = *wf_pf_udp_dst = *wf_save_file = 0;
#endif
srandom(time(NULL));
mask_from_preflen6_prepare();
memset(&params, 0, sizeof(params));
*pidfile = 0;
struct desync_profile_list *dpl;
struct desync_profile *dp;
int desync_profile_count=0;
if (!(dpl = dp_list_add(&params.desync_profiles)))
{
DLOG_ERR("desync_profile_add: out of memory\n");
exit_clean(1);
}
dp = &dpl->dp;
dp->n = ++desync_profile_count;
#ifdef __linux__
params.qnum = -1;
#elif defined(BSD)
params.port = 0;
#endif
params.desync_fwmark = DPI_DESYNC_FWMARK_DEFAULT;
params.ctrack_t_syn = CTRACK_T_SYN;
params.ctrack_t_est = CTRACK_T_EST;
params.ctrack_t_fin = CTRACK_T_FIN;
params.ctrack_t_udp = CTRACK_T_UDP;
LIST_INIT(&params.hostlists);
LIST_INIT(&params.ipsets);
#ifdef __CYGWIN__
LIST_INIT(&params.ssid_filter);
LIST_INIT(&params.nlm_filter);
#else
if (can_drop_root()) // are we root ?
{
params.uid = params.gid = 0x7FFFFFFF; // default uid:gid
params.droproot = true;
}
#endif
if (argc>=2 && argv[1][0]=='@')
{
// config from a file
char buf[MAX_CONFIG_FILE_SIZE];
buf[0]='x'; // fake argv[0]
buf[1]=' ';
size_t bufsize=sizeof(buf)-3;
if (!load_file(argv[1]+1,buf+2,&bufsize))
{
DLOG_ERR("could not load config file '%s'\n",argv[1]+1);
exit_clean(1);
}
buf[bufsize+2]=0;
// wordexp fails if it sees \t \n \r between args
replace_char(buf,'\n',' ');
replace_char(buf,'\r',' ');
replace_char(buf,'\t',' ');
if (wordexp(buf, &params.wexp, WRDE_NOCMD))
{
DLOG_ERR("failed to split command line options from file '%s'\n",argv[1]+1);
exit_clean(1);
}
argv=params.wexp.we_wordv;
argc=params.wexp.we_wordc;
}
const struct option long_options[] = {
{"debug",optional_argument,0,0}, // optidx=0
#ifdef __linux__
{"qnum",required_argument,0,0}, // optidx=1
#elif defined(BSD)
{"port",required_argument,0,0}, // optidx=1
#else
{"disabled_argument_1",no_argument,0,0},// optidx=1
#endif
{"daemon",no_argument,0,0}, // optidx=2
{"pidfile",required_argument,0,0}, // optidx=3
#ifndef __CYGWIN__
{"user",required_argument,0,0 }, // optidx=4
{"uid",required_argument,0,0 }, // optidx=5
#else
{"disabled_argument_2",no_argument,0,0}, // optidx=4
{"disabled_argument_3",no_argument,0,0}, // optidx=5
#endif
{"wsize",required_argument,0,0}, // optidx=6
{"wssize",required_argument,0,0}, // optidx=7
{"wssize-cutoff",required_argument,0,0},// optidx=8
{"ctrack-timeouts",required_argument,0,0},// optidx=9
{"hostcase",no_argument,0,0}, // optidx=10
{"hostspell",required_argument,0,0}, // optidx=11
{"hostnospace",no_argument,0,0}, // optidx=12
{"domcase",no_argument,0,0 }, // optidx=13
{"dpi-desync",required_argument,0,0}, // optidx=14
#ifdef __linux__
{"dpi-desync-fwmark",required_argument,0,0}, // optidx=15
#elif defined(SO_USER_COOKIE)
{"dpi-desync-sockarg",required_argument,0,0}, // optidx=15
#else
{"disabled_argument_4",no_argument,0,0}, // optidx=15
#endif
{"dpi-desync-ttl",required_argument,0,0}, // optidx=16
{"dpi-desync-ttl6",required_argument,0,0}, // optidx=17
{"dpi-desync-autottl",optional_argument,0,0}, // optidx=18
{"dpi-desync-autottl6",optional_argument,0,0}, // optidx=19
{"dpi-desync-fooling",required_argument,0,0}, // optidx=20
{"dpi-desync-repeats",required_argument,0,0}, // optidx=21
{"dpi-desync-skip-nosni",optional_argument,0,0},// optidx=22
{"dpi-desync-split-pos",required_argument,0,0},// optidx=23
{"dpi-desync-split-http-req",required_argument,0,0 },// optidx=24
{"dpi-desync-split-tls",required_argument,0,0 },// optidx=25
{"dpi-desync-split-seqovl",required_argument,0,0 },// optidx=26
{"dpi-desync-split-seqovl-pattern",required_argument,0,0 },// optidx=27
{"dpi-desync-ipfrag-pos-tcp",required_argument,0,0},// optidx=28
{"dpi-desync-ipfrag-pos-udp",required_argument,0,0},// optidx=29
{"dpi-desync-badseq-increment",required_argument,0,0},// optidx=30
{"dpi-desync-badack-increment",required_argument,0,0},// optidx=31
{"dpi-desync-any-protocol",optional_argument,0,0},// optidx=32
{"dpi-desync-fake-http",required_argument,0,0},// optidx=33
{"dpi-desync-fake-tls",required_argument,0,0},// optidx=34
{"dpi-desync-fake-unknown",required_argument,0,0},// optidx=35
{"dpi-desync-fake-syndata",required_argument,0,0},// optidx=36
{"dpi-desync-fake-quic",required_argument,0,0},// optidx=37
{"dpi-desync-fake-wireguard",required_argument,0,0},// optidx=38
{"dpi-desync-fake-dht",required_argument,0,0},// optidx=39
{"dpi-desync-fake-unknown-udp",required_argument,0,0},// optidx=40
{"dpi-desync-udplen-increment",required_argument,0,0},// optidx=41
{"dpi-desync-udplen-pattern",required_argument,0,0},// optidx=42
{"dpi-desync-cutoff",required_argument,0,0},// optidx=43
{"dpi-desync-start",required_argument,0,0},// optidx=43
{"hostlist",required_argument,0,0}, // optidx=44
{"hostlist-exclude",required_argument,0,0}, // optidx=45
{"hostlist-auto",required_argument,0,0}, // optidx=46
{"hostlist-auto-fail-threshold",required_argument,0,0}, // optidx=48
{"hostlist-auto-fail-time",required_argument,0,0}, // optidx=49
{"hostlist-auto-retrans-threshold",required_argument,0,0}, // optidx=50
{"hostlist-auto-debug",required_argument,0,0}, // optidx=51
{"new",no_argument,0,0}, // optidx=52
{"filter-l3",required_argument,0,0}, // optidx=53
{"filter-tcp",required_argument,0,0}, // optidx=54
{"filter-udp",required_argument,0,0}, // optidx=55
{"filter-l7",required_argument,0,0}, // optidx=56
{"ipset",required_argument,0,0}, // optidx=57
{"ipset-exclude",required_argument,0,0},// optidx=58
#ifdef __linux__
{"bind-fix4",no_argument,0,0}, // optidx=59
{"bind-fix6",no_argument,0,0}, // optidx=60
#elif defined(__CYGWIN__)
{"wf-iface",required_argument,0,0}, // optidx=59
{"wf-l3",required_argument,0,0}, // optidx=60
{"wf-tcp",required_argument,0,0}, // optidx=61
{"wf-udp",required_argument,0,0}, // optidx=62
{"wf-raw",required_argument,0,0}, // optidx=63
{"wf-save",required_argument,0,0}, // optidx=64
{"ssid-filter",required_argument,0,0}, // optidx=65
{"nlm-filter",required_argument,0,0}, // optidx=66
{"nlm-list",optional_argument,0,0}, // optidx=67
#endif
{NULL,0,NULL,0}
};
if (argc < 2) exithelp();
while ((v = getopt_long_only(argc, argv, "", long_options, &option_index)) != -1)
{
if (v) exithelp();
switch (option_index)
{
case 0: /* debug */
if (optarg)
{
if (*optarg=='@')
{
strncpy(params.debug_logfile,optarg+1,sizeof(params.debug_logfile));
params.debug_logfile[sizeof(params.debug_logfile)-1] = 0;
FILE *F = fopen(params.debug_logfile,"wt");
if (!F)
{
fprintf(stderr, "cannot create %s\n", params.debug_logfile);
exit_clean(1);
}
#ifndef __CYGWIN__
if (params.droproot && chown(params.debug_logfile, params.uid, -1))
fprintf(stderr, "could not chown %s. log file may not be writable after privilege drop\n", params.debug_logfile);
#endif
params.debug = true;
params.debug_target = LOG_TARGET_FILE;
}
else if (!strcmp(optarg,"syslog"))
{
params.debug = true;
params.debug_target = LOG_TARGET_SYSLOG;
openlog(progname,LOG_PID,LOG_USER);
}
else
{
params.debug = !!atoi(optarg);
params.debug_target = LOG_TARGET_CONSOLE;
}
}
else
{
params.debug = true;
params.debug_target = LOG_TARGET_CONSOLE;
}
break;
#ifndef __CYGWIN__
case 1: /* qnum or port */
#ifdef __linux__
params.qnum = atoi(optarg);
if (params.qnum < 0 || params.qnum>65535)
{
DLOG_ERR("bad qnum\n");
exit_clean(1);
}
#elif defined(BSD)
{
int i = atoi(optarg);
if (i <= 0 || i > 65535)
{
DLOG_ERR("bad port number\n");
exit_clean(1);
}
params.port = (uint16_t)i;
}
#endif
break;
#endif
case 2: /* daemon */
daemon = true;
break;
case 3: /* pidfile */
strncpy(pidfile, optarg, sizeof(pidfile));
pidfile[sizeof(pidfile) - 1] = '\0';
break;
#ifndef __CYGWIN__
case 4: /* user */
{
struct passwd *pwd = getpwnam(optarg);
if (!pwd)
{
DLOG_ERR("non-existent username supplied\n");
exit_clean(1);
}
params.uid = pwd->pw_uid;
params.gid = pwd->pw_gid;
params.droproot = true;
break;
}
case 5: /* uid */
params.gid = 0x7FFFFFFF; // default gid. drop gid=0
params.droproot = true;
if (sscanf(optarg, "%u:%u", &params.uid, &params.gid)<1)
{
DLOG_ERR("--uid should be : uid[:gid]\n");
exit_clean(1);
}
break;
#endif
case 6: /* wsize */
if (!parse_ws_scale_factor(optarg,&dp->wsize,&dp->wscale))
exit_clean(1);
break;
case 7: /* wssize */
if (!parse_ws_scale_factor(optarg,&dp->wssize,&dp->wsscale))
exit_clean(1);
break;
case 8: /* wssize-cutoff */
if (!parse_cutoff(optarg, &dp->wssize_cutoff, &dp->wssize_cutoff_mode))
{
DLOG_ERR("invalid wssize-cutoff value\n");
exit_clean(1);
}
break;
case 9: /* ctrack-timeouts */
if (sscanf(optarg, "%u:%u:%u:%u", &params.ctrack_t_syn, &params.ctrack_t_est, &params.ctrack_t_fin, &params.ctrack_t_udp)<3)
{
DLOG_ERR("invalid ctrack-timeouts value\n");
exit_clean(1);
}
break;
case 10: /* hostcase */
dp->hostcase = true;
break;
case 11: /* hostspell */
if (strlen(optarg) != 4)
{
DLOG_ERR("hostspell must be exactly 4 chars long\n");
exit_clean(1);
}
dp->hostcase = true;
memcpy(dp->hostspell, optarg, 4);
break;
case 12: /* hostnospace */
dp->hostnospace = true;
break;
case 13: /* domcase */
dp->domcase = true;
break;
case 14: /* dpi-desync */
{
char *mode=optarg,*mode2,*mode3;
mode2 = mode ? strchr(mode,',') : NULL;
if (mode2) *mode2++=0;
mode3 = mode2 ? strchr(mode2,',') : NULL;
if (mode3) *mode3++=0;
dp->desync_mode0 = desync_mode_from_string(mode);
if (desync_valid_zero_stage(dp->desync_mode0))
{
mode = mode2;
mode2 = mode3;
mode3 = NULL;
}
else
{
dp->desync_mode0 = DESYNC_NONE;
}
dp->desync_mode = desync_mode_from_string(mode);
dp->desync_mode2 = desync_mode_from_string(mode2);
if (dp->desync_mode0==DESYNC_INVALID || dp->desync_mode==DESYNC_INVALID || dp->desync_mode2==DESYNC_INVALID)
{
DLOG_ERR("invalid dpi-desync mode\n");
exit_clean(1);
}
if (mode3)
{
DLOG_ERR("invalid desync combo : %s+%s+%s\n",mode,mode2,mode3);
exit_clean(1);
}
if (dp->desync_mode2 && (desync_only_first_stage(dp->desync_mode) || !(desync_valid_first_stage(dp->desync_mode) && desync_valid_second_stage(dp->desync_mode2))))
{
DLOG_ERR("invalid desync combo : %s+%s\n", mode,mode2);
exit_clean(1);
}
#if defined(__OpenBSD__)
if (dp->desync_mode==DESYNC_IPFRAG2 || dp->desync_mode2==DESYNC_IPFRAG2)
{
DLOG_ERR("OpenBSD has checksum issues with fragmented packets. ipfrag disabled.\n");
exit_clean(1);
}
#endif
}
break;
#ifndef __CYGWIN__
case 15: /* dpi-desync-fwmark/dpi-desync-sockarg */
#if defined(__linux__) || defined(SO_USER_COOKIE)
params.desync_fwmark = 0;
if (sscanf(optarg, "0x%X", &params.desync_fwmark)<=0) sscanf(optarg, "%u", &params.desync_fwmark);
if (!params.desync_fwmark)
{
DLOG_ERR("fwmark/sockarg should be decimal or 0xHEX and should not be zero\n");
exit_clean(1);
}
#else
DLOG_ERR("fmwark/sockarg not supported in this OS\n");
exit_clean(1);
#endif
break;
#endif
case 16: /* dpi-desync-ttl */
dp->desync_ttl = (uint8_t)atoi(optarg);
break;
case 17: /* dpi-desync-ttl6 */
dp->desync_ttl6 = (uint8_t)atoi(optarg);
break;
case 18: /* dpi-desync-autottl */
if (!parse_autottl(optarg, &dp->desync_autottl))
{
DLOG_ERR("dpi-desync-autottl value error\n");
exit_clean(1);
}
break;
case 19: /* dpi-desync-autottl6 */
if (!parse_autottl(optarg, &dp->desync_autottl6))
{
DLOG_ERR("dpi-desync-autottl6 value error\n");
exit_clean(1);
}
break;
case 20: /* dpi-desync-fooling */
{
char *e,*p = optarg;
while (p)
{
e = strchr(p,',');
if (e) *e++=0;
if (!strcmp(p,"md5sig"))
dp->desync_fooling_mode |= FOOL_MD5SIG;
else if (!strcmp(p,"ts"))
dp->desync_fooling_mode |= FOOL_TS;
else if (!strcmp(p,"badsum"))
{
#ifdef __OpenBSD__
DLOG_CONDUP("\nWARNING !!! OpenBSD may forcibly recompute tcp/udp checksums !!! In this case badsum fooling will not work.\nYou should check tcp checksum correctness in tcpdump manually before using badsum.\n\n");
#endif
dp->desync_fooling_mode |= FOOL_BADSUM;
}
else if (!strcmp(p,"badseq"))
dp->desync_fooling_mode |= FOOL_BADSEQ;
else if (!strcmp(p,"datanoack"))
dp->desync_fooling_mode |= FOOL_DATANOACK;
else if (!strcmp(p,"hopbyhop"))
dp->desync_fooling_mode |= FOOL_HOPBYHOP;
else if (!strcmp(p,"hopbyhop2"))
dp->desync_fooling_mode |= FOOL_HOPBYHOP2;
else if (strcmp(p,"none"))
{
DLOG_ERR("dpi-desync-fooling allowed values : none,md5sig,ts,badseq,badsum,datanoack,hopbyhop,hopbyhop2\n");
exit_clean(1);
}
p = e;
}
}
break;
case 21: /* dpi-desync-repeats */
if (sscanf(optarg,"%u",&dp->desync_repeats)<1 || !dp->desync_repeats || dp->desync_repeats>20)
{
DLOG_ERR("dpi-desync-repeats must be within 1..20\n");
exit_clean(1);
}
break;
case 22: /* dpi-desync-skip-nosni */
dp->desync_skip_nosni = !optarg || atoi(optarg);
break;
case 23: /* dpi-desync-split-pos */
if (sscanf(optarg,"%u",&dp->desync_split_pos)<1 || dp->desync_split_pos<1)
{
DLOG_ERR("dpi-desync-split-pos is not valid\n");
exit_clean(1);
}
break;
case 24: /* dpi-desync-split-http-req */
if (!parse_httpreqpos(optarg, &dp->desync_split_http_req))
{
DLOG_ERR("Invalid argument for dpi-desync-split-http-req\n");
exit_clean(1);
}
break;
case 25: /* dpi-desync-split-tls */
if (!parse_tlspos(optarg, &dp->desync_split_tls))
{
DLOG_ERR("Invalid argument for dpi-desync-split-tls\n");
exit_clean(1);
}
break;
case 26: /* dpi-desync-split-seqovl */
if (sscanf(optarg,"%u",&dp->desync_seqovl)<1)
{
DLOG_ERR("dpi-desync-split-seqovl is not valid\n");
exit_clean(1);
}
break;
case 27: /* dpi-desync-split-seqovl-pattern */
{
char buf[sizeof(dp->seqovl_pattern)];
size_t sz=sizeof(buf);
load_file_or_exit(optarg,buf,&sz);
fill_pattern(dp->seqovl_pattern,sizeof(dp->seqovl_pattern),buf,sz);
}
break;
case 28: /* dpi-desync-ipfrag-pos-tcp */
if (sscanf(optarg,"%u",&dp->desync_ipfrag_pos_tcp)<1 || dp->desync_ipfrag_pos_tcp<1 || dp->desync_ipfrag_pos_tcp>DPI_DESYNC_MAX_FAKE_LEN)
{
DLOG_ERR("dpi-desync-ipfrag-pos-tcp must be within 1..%u range\n",DPI_DESYNC_MAX_FAKE_LEN);
exit_clean(1);
}
if (dp->desync_ipfrag_pos_tcp & 7)
{
DLOG_ERR("dpi-desync-ipfrag-pos-tcp must be multiple of 8\n");
exit_clean(1);
}
break;
case 29: /* dpi-desync-ipfrag-pos-udp */
if (sscanf(optarg,"%u",&dp->desync_ipfrag_pos_udp)<1 || dp->desync_ipfrag_pos_udp<1 || dp->desync_ipfrag_pos_udp>DPI_DESYNC_MAX_FAKE_LEN)
{
DLOG_ERR("dpi-desync-ipfrag-pos-udp must be within 1..%u range\n",DPI_DESYNC_MAX_FAKE_LEN);
exit_clean(1);
}
if (dp->desync_ipfrag_pos_udp & 7)
{
DLOG_ERR("dpi-desync-ipfrag-pos-udp must be multiple of 8\n");
exit_clean(1);
}
break;
case 30: /* dpi-desync-badseq-increments */
if (!parse_badseq_increment(optarg,&dp->desync_badseq_increment))
{
DLOG_ERR("dpi-desync-badseq-increment should be signed decimal or signed 0xHEX\n");
exit_clean(1);
}
break;
case 31: /* dpi-desync-badack-increment */
if (!parse_badseq_increment(optarg,&dp->desync_badseq_ack_increment))
{
DLOG_ERR("dpi-desync-badack-increment should be signed decimal or signed 0xHEX\n");
exit_clean(1);
}
break;
case 32: /* dpi-desync-any-protocol */
dp->desync_any_proto = !optarg || atoi(optarg);
break;
case 33: /* dpi-desync-fake-http */
dp->fake_http_size = sizeof(dp->fake_http);
load_file_or_exit(optarg,dp->fake_http,&dp->fake_http_size);
break;
case 34: /* dpi-desync-fake-tls */
dp->fake_tls_size = sizeof(dp->fake_tls);
load_file_or_exit(optarg,dp->fake_tls,&dp->fake_tls_size);
break;
case 35: /* dpi-desync-fake-unknown */
dp->fake_unknown_size = sizeof(dp->fake_unknown);
load_file_or_exit(optarg,dp->fake_unknown,&dp->fake_unknown_size);
break;
case 36: /* dpi-desync-fake-syndata */
dp->fake_syndata_size = sizeof(dp->fake_syndata);
load_file_or_exit(optarg,dp->fake_syndata,&dp->fake_syndata_size);
break;
case 37: /* dpi-desync-fake-quic */
dp->fake_quic_size = sizeof(dp->fake_quic);
load_file_or_exit(optarg,dp->fake_quic,&dp->fake_quic_size);
break;
case 38: /* dpi-desync-fake-wireguard */
dp->fake_wg_size = sizeof(dp->fake_wg);
load_file_or_exit(optarg,dp->fake_wg,&dp->fake_wg_size);
break;
case 39: /* dpi-desync-fake-dht */
dp->fake_dht_size = sizeof(dp->fake_dht);
load_file_or_exit(optarg,dp->fake_dht,&dp->fake_dht_size);
break;
case 40: /* dpi-desync-fake-unknown-udp */
dp->fake_unknown_udp_size = sizeof(dp->fake_unknown_udp);
load_file_or_exit(optarg,dp->fake_unknown_udp,&dp->fake_unknown_udp_size);
break;
case 41: /* dpi-desync-udplen-increment */
if (sscanf(optarg,"%d",&dp->udplen_increment)<1 || dp->udplen_increment>0x7FFF || dp->udplen_increment<-0x8000)
{
DLOG_ERR("dpi-desync-udplen-increment must be integer within -32768..32767 range\n");
exit_clean(1);
}
break;
case 42: /* dpi-desync-udplen-pattern */
{
char buf[sizeof(dp->udplen_pattern)];
size_t sz=sizeof(buf);
load_file_or_exit(optarg,buf,&sz);
fill_pattern(dp->udplen_pattern,sizeof(dp->udplen_pattern),buf,sz);
}
break;
case 43: /* desync-cutoff */
if (!parse_cutoff(optarg, &dp->desync_cutoff, &dp->desync_cutoff_mode))
{
DLOG_ERR("invalid desync-cutoff value\n");
exit_clean(1);
}
break;
case 44: /* desync-start */
if (!parse_cutoff(optarg, &dp->desync_start, &dp->desync_start_mode))
{
DLOG_ERR("invalid desync-start value\n");
exit_clean(1);
}
break;
case 45: /* hostlist */
if (!RegisterHostlist(dp, false, optarg))
{
DLOG_ERR("failed to register hostlist '%s'\n", optarg);
exit_clean(1);
}
break;
case 46: /* hostlist-exclude */
if (!RegisterHostlist(dp, true, optarg))
{
DLOG_ERR("failed to register hostlist '%s'\n", optarg);
exit_clean(1);
}
break;
case 47: /* hostlist-auto */
if (dp->hostlist_auto)
{
DLOG_ERR("only one auto hostlist per profile is supported\n");
exit_clean(1);
}
{
FILE *F = fopen(optarg,"a+b");
if (!F)
{
DLOG_ERR("cannot create %s\n", optarg);
exit_clean(1);
}
bool bGzip = is_gzip(F);
fclose(F);
if (bGzip)
{
DLOG_ERR("gzipped auto hostlists are not supported\n");
exit_clean(1);
}
#ifndef __CYGWIN__
if (params.droproot && chown(optarg, params.uid, -1))
DLOG_ERR("could not chown %s. auto hostlist file may not be writable after privilege drop\n", optarg);
#endif
}
if (!(dp->hostlist_auto=RegisterHostlist(dp, false, optarg)))
{
DLOG_ERR("failed to register hostlist '%s'\n", optarg);
exit_clean(1);
}
break;
case 48: /* hostlist-auto-fail-threshold */
dp->hostlist_auto_fail_threshold = (uint8_t)atoi(optarg);
if (dp->hostlist_auto_fail_threshold<1 || dp->hostlist_auto_fail_threshold>20)
{
DLOG_ERR("auto hostlist fail threshold must be within 1..20\n");
exit_clean(1);
}
break;
case 49: /* hostlist-auto-fail-time */
dp->hostlist_auto_fail_time = (uint8_t)atoi(optarg);
if (dp->hostlist_auto_fail_time<1)
{
DLOG_ERR("auto hostlist fail time is not valid\n");
exit_clean(1);
}
break;
case 50: /* hostlist-auto-retrans-threshold */
dp->hostlist_auto_retrans_threshold = (uint8_t)atoi(optarg);
if (dp->hostlist_auto_retrans_threshold<2 || dp->hostlist_auto_retrans_threshold>10)
{
DLOG_ERR("auto hostlist fail threshold must be within 2..10\n");
exit_clean(1);
}
break;
case 51: /* hostlist-auto-debug */
{
FILE *F = fopen(optarg,"a+t");
if (!F)
{
DLOG_ERR("cannot create %s\n", optarg);
exit_clean(1);
}
fclose(F);
#ifndef __CYGWIN__
if (params.droproot && chown(optarg, params.uid, -1))
DLOG_ERR("could not chown %s. auto hostlist debug log may not be writable after privilege drop\n", optarg);
#endif
strncpy(params.hostlist_auto_debuglog, optarg, sizeof(params.hostlist_auto_debuglog));
params.hostlist_auto_debuglog[sizeof(params.hostlist_auto_debuglog) - 1] = '\0';
}
break;
case 52: /* new */
if (!(dpl = dp_list_add(&params.desync_profiles)))
{
DLOG_ERR("desync_profile_add: out of memory\n");
exit_clean(1);
}
dp = &dpl->dp;
dp->n = ++desync_profile_count;
break;
case 53: /* filter-l3 */
if (!wf_make_l3(optarg,&dp->filter_ipv4,&dp->filter_ipv6))
{
DLOG_ERR("bad value for --filter-l3\n");
exit_clean(1);
}
break;
case 54: /* filter-tcp */
if (!parse_pf_list(optarg,&dp->pf_tcp))
{
DLOG_ERR("Invalid port filter : %s\n",optarg);
exit_clean(1);
}
// deny tcp if not set
if (!port_filters_deny_if_empty(&dp->pf_udp))
exit_clean(1);
break;
case 55: /* filter-udp */
if (!parse_pf_list(optarg,&dp->pf_udp))
{
DLOG_ERR("Invalid port filter : %s\n",optarg);
exit_clean(1);
}
// deny tcp if not set
if (!port_filters_deny_if_empty(&dp->pf_tcp))
exit_clean(1);
break;
case 56: /* filter-l7 */
if (!parse_l7_list(optarg,&dp->filter_l7))
{
DLOG_ERR("Invalid l7 filter : %s\n",optarg);
exit_clean(1);
}
break;
case 57: /* ipset */
if (!RegisterIpset(dp, false, optarg))
{
DLOG_ERR("failed to register ipset '%s'\n", optarg);
exit_clean(1);
}
break;
case 58: /* ipset-exclude */
if (!RegisterIpset(dp, true, optarg))
{
DLOG_ERR("failed to register ipset '%s'\n", optarg);
exit_clean(1);
}
break;
#ifdef __linux__
case 59: /* bind-fix4 */
params.bind_fix4 = true;
break;
case 60: /* bind-fix6 */
params.bind_fix6 = true;
break;
#elif defined(__CYGWIN__)
case 59: /* wf-iface */
if (!sscanf(optarg,"%u.%u",&IfIdx,&SubIfIdx))
{
DLOG_ERR("bad value for --wf-iface\n");
exit_clean(1);
}
break;
case 60: /* wf-l3 */
if (!wf_make_l3(optarg,&wf_ipv4,&wf_ipv6))
{
DLOG_ERR("bad value for --wf-l3\n");
exit_clean(1);
}
break;
case 61: /* wf-tcp */
hash_wf_tcp=hash_jen(optarg,strlen(optarg));
if (!wf_make_pf(optarg,"tcp","SrcPort",wf_pf_tcp_src,sizeof(wf_pf_tcp_src)) ||
!wf_make_pf(optarg,"tcp","DstPort",wf_pf_tcp_dst,sizeof(wf_pf_tcp_dst)))
{
DLOG_ERR("bad value for --wf-tcp\n");
exit_clean(1);
}
break;
case 62: /* wf-udp */
hash_wf_udp=hash_jen(optarg,strlen(optarg));
if (!wf_make_pf(optarg,"udp","SrcPort",wf_pf_udp_src,sizeof(wf_pf_udp_src)) ||
!wf_make_pf(optarg,"udp","DstPort",wf_pf_udp_dst,sizeof(wf_pf_udp_dst)))
{
DLOG_ERR("bad value for --wf-udp\n");
exit_clean(1);
}
break;
case 63: /* wf-raw */
hash_wf_raw=hash_jen(optarg,strlen(optarg));
if (optarg[0]=='@')
{
size_t sz = sizeof(windivert_filter)-1;
load_file_or_exit(optarg+1,windivert_filter,&sz);
windivert_filter[sz] = 0;
}
else
{
strncpy(windivert_filter, optarg, sizeof(windivert_filter));
windivert_filter[sizeof(windivert_filter) - 1] = '\0';
}
break;
case 64: /* wf-save */
strncpy(wf_save_file, optarg, sizeof(wf_save_file));
wf_save_file[sizeof(wf_save_file) - 1] = '\0';
break;
case 65: /* ssid-filter */
hash_ssid_filter=hash_jen(optarg,strlen(optarg));
{
char *e,*p = optarg;
while (p)
{
e = strchr(p,',');
if (e) *e++=0;
if (*p && !strlist_add(&params.ssid_filter, p))
{
DLOG_ERR("strlist_add failed\n");
exit_clean(1);
}
p = e;
}
}
break;
case 66: /* nlm-filter */
hash_nlm_filter=hash_jen(optarg,strlen(optarg));
{
char *e,*p = optarg;
while (p)
{
e = strchr(p,',');
if (e) *e++=0;
if (*p && !strlist_add(&params.nlm_filter, p))
{
DLOG_ERR("strlist_add failed\n");
exit_clean(1);
}
p = e;
}
}
break;
case 67: /* nlm-list */
if (!nlm_list(optarg && !strcmp(optarg,"all")))
{
DLOG_ERR("could not get list of NLM networks\n");
exit_clean(1);
}
exit_clean(0);
#endif
}
}
// do not need args from file anymore
cleanup_args();
argv=NULL; argc=0;
#ifdef __linux__
if (params.qnum<0)
{
DLOG_ERR("Need queue number (--qnum)\n");
exit_clean(1);
}
#elif defined(BSD)
if (!params.port)
{
DLOG_ERR("Need divert port (--port)\n");
exit_clean(1);
}
#elif defined(__CYGWIN__)
if (!*windivert_filter)
{
if (!*wf_pf_tcp_src && !*wf_pf_udp_src)
{
DLOG_ERR("windivert filter : must specify port filter\n");
exit_clean(1);
}
if (!wf_make_filter(windivert_filter, sizeof(windivert_filter), IfIdx, SubIfIdx, wf_ipv4, wf_ipv6, wf_pf_tcp_src, wf_pf_tcp_dst, wf_pf_udp_src, wf_pf_udp_dst))
{
DLOG_ERR("windivert filter : could not make filter\n");
exit_clean(1);
}
}
DLOG("windivert filter size: %zu\nwindivert filter:\n%s\n",strlen(windivert_filter),windivert_filter);
if (*wf_save_file)
{
if (save_file(wf_save_file,windivert_filter,strlen(windivert_filter)))
{
DLOG_ERR("windivert filter: raw filter saved to %s\n", wf_save_file);
exit_clean(0);
}
else
{
DLOG_ERR("windivert filter: could not save raw filter to %s\n", wf_save_file);
exit_clean(1);
}
}
HANDLE hMutexArg;
{
char mutex_name[128];
snprintf(mutex_name,sizeof(mutex_name),"Global\\winws_arg_%u_%u_%u_%u_%u_%u_%u_%u_%u",hash_wf_tcp,hash_wf_udp,hash_wf_raw,hash_ssid_filter,hash_nlm_filter,IfIdx,SubIfIdx,wf_ipv4,wf_ipv6);
hMutexArg = CreateMutexA(NULL,TRUE,mutex_name);
if (hMutexArg && GetLastError()==ERROR_ALREADY_EXISTS)
{
CloseHandle(hMutexArg); hMutexArg = NULL;
DLOG_ERR("A copy of winws is already running with the same filter\n");
goto exiterr;
}
}
#endif
DLOG("adding low-priority default empty desync profile\n");
// add default empty profile
if (!(dpl = dp_list_add(&params.desync_profiles)))
{
DLOG_ERR("desync_profile_add: out of memory\n");
exit_clean(1);
}
DLOG_CONDUP("we have %d user defined desync profile(s) and default low priority profile 0\n",desync_profile_count);
LIST_FOREACH(dpl, &params.desync_profiles, next)
{
dp = &dpl->dp;
// not specified - use desync_ttl value instead
if (dp->desync_ttl6 == 0xFF) dp->desync_ttl6=dp->desync_ttl;
if (!AUTOTTL_ENABLED(dp->desync_autottl6)) dp->desync_autottl6 = dp->desync_autottl;
if (AUTOTTL_ENABLED(dp->desync_autottl))
DLOG("[profile %d] autottl ipv4 %u:%u-%u\n",dp->n,dp->desync_autottl.delta,dp->desync_autottl.min,dp->desync_autottl.max);
if (AUTOTTL_ENABLED(dp->desync_autottl6))
DLOG("[profile %d] autottl ipv6 %u:%u-%u\n",dp->n,dp->desync_autottl6.delta,dp->desync_autottl6.min,dp->desync_autottl6.max);
if (dp->desync_split_tls==tlspos_none && dp->desync_split_pos) dp->desync_split_tls=tlspos_pos;
if (dp->desync_split_http_req==httpreqpos_none && dp->desync_split_pos) dp->desync_split_http_req=httpreqpos_pos;
}
if (!LoadAllHostLists())
{
DLOG_ERR("hostlists load failed\n");
exit_clean(1);
}
if (!LoadAllIpsets())
{
DLOG_ERR("ipset load failed\n");
exit_clean(1);
}
DLOG("\nlists summary:\n");
HostlistsDebug();
IpsetsDebug();
DLOG("\n");
if (daemon) daemonize();
if (*pidfile && !writepid(pidfile))
{
DLOG_ERR("could not write pidfile\n");
goto exiterr;
}
DLOG("initializing conntrack with timeouts tcp=%u:%u:%u udp=%u\n", params.ctrack_t_syn, params.ctrack_t_est, params.ctrack_t_fin, params.ctrack_t_udp);
ConntrackPoolInit(&params.conntrack, 10, params.ctrack_t_syn, params.ctrack_t_est, params.ctrack_t_fin, params.ctrack_t_udp);
#ifdef __linux__
result = nfq_main();
#elif defined(BSD)
result = dvt_main();
#elif defined(__CYGWIN__)
result = win_main(windivert_filter);
#else
#error unsupported OS
#endif
ex:
rawsend_cleanup();
cleanup_params();
#ifdef __CYGWIN__
if (hMutexArg)
{
ReleaseMutex(hMutexArg);
CloseHandle(hMutexArg);
}
#endif
return result;
exiterr:
result = 1;
goto ex;
}
Reference in New Issue View Git Blame Copy Permalink