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syndata desync mode

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bol-van 2024-03-19 13:50:20 +03:00
parent 148108785c
commit 684869e54f
7 changed files with 103 additions and 49 deletions
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6
blockcheck.sh
View File

@ -477,7 +477,7 @@ curl_test_https_tls12()
# $2 - domain name # $2 - domain name
# do not use tls 1.3 to make sure server certificate is not encrypted # do not use tls 1.3 to make sure server certificate is not encrypted
curl_with_dig $1 $2 -ISs -A "$USER_AGENT" --max-time $CURL_MAX_TIME $CURL_OPT --tlsv1.2 $TLSMAX12 "https://$2" -o /dev/null 2>&1 curl_with_dig $1 $2 -ISs -A "$USER_AGENT" --max-time $CURL_MAX_TIME $CURL_OPT --tlsv1.2 $TLSMAX12 "https://$2" -o /dev/null 2>&1
} }
curl_test_https_tls13() curl_test_https_tls13()
{ {
@ -485,7 +485,7 @@ curl_test_https_tls13()
# $2 - domain name # $2 - domain name
# force TLS1.3 mode # force TLS1.3 mode
curl_with_dig $1 $2 -ISs -A "$USER_AGENT" --max-time $CURL_MAX_TIME $CURL_OPT --tlsv1.3 $TLSMAX13 "https://$2" -o /dev/null 2>&1 curl_with_dig $1 $2 -ISs -A "$USER_AGENT" --max-time $CURL_MAX_TIME $CURL_OPT --tlsv1.3 $TLSMAX13 "https://$2" -o /dev/null 2>&1
} }
curl_test_http3() curl_test_http3()
@ -494,7 +494,7 @@ curl_test_http3()
# $2 - domain name # $2 - domain name
# force TLS1.3 mode # force TLS1.3 mode
curl_with_dig $1 $2 -ISs -A "$USER_AGENT" --max-time $CURL_MAX_TIME --http3-only $CURL_OPT "https://$2" -o /dev/null 2>&1 curl_with_dig $1 $2 -ISs -A "$USER_AGENT" --max-time $CURL_MAX_TIME --http3-only $CURL_OPT "https://$2" -o /dev/null 2>&1
} }
ipt_scheme() ipt_scheme()

6
nfq/darkmagic.c
View File

@ -560,6 +560,12 @@ bool ip_frag(
return false; return false;
} }
void rewrite_ttl(struct ip *ip, struct ip6_hdr *ip6, uint8_t ttl)
{
if (ip) ip->ip_ttl = ttl;
if (ip6) ip6->ip6_ctlun.ip6_un1.ip6_un1_hlim = ttl;
}
void extract_ports(const struct tcphdr *tcphdr, const struct udphdr *udphdr, uint8_t *proto, uint16_t *sport, uint16_t *dport) void extract_ports(const struct tcphdr *tcphdr, const struct udphdr *udphdr, uint8_t *proto, uint16_t *sport, uint16_t *dport)
{ {

3
nfq/darkmagic.h
View File

@ -124,7 +124,8 @@ bool ip_frag(
size_t frag_pos, uint32_t ident, size_t frag_pos, uint32_t ident,
uint8_t *pkt1, size_t *pkt1_size, uint8_t *pkt1, size_t *pkt1_size,
uint8_t *pkt2, size_t *pkt2_size); uint8_t *pkt2, size_t *pkt2_size);
void rewrite_ttl(struct ip *ip, struct ip6_hdr *ip6, uint8_t ttl);
void extract_ports(const struct tcphdr *tcphdr, const struct udphdr *udphdr, uint8_t *proto, uint16_t *sport, uint16_t *dport); void extract_ports(const struct tcphdr *tcphdr, const struct udphdr *udphdr, uint8_t *proto, uint16_t *sport, uint16_t *dport);
void extract_endpoints(const struct ip *ip,const struct ip6_hdr *ip6hdr,const struct tcphdr *tcphdr,const struct udphdr *udphdr, struct sockaddr_storage *src, struct sockaddr_storage *dst); void extract_endpoints(const struct ip *ip,const struct ip6_hdr *ip6hdr,const struct tcphdr *tcphdr,const struct udphdr *udphdr, struct sockaddr_storage *src, struct sockaddr_storage *dst);

58
nfq/desync.c
View File

@ -53,7 +53,7 @@ void desync_init(void)
bool desync_valid_zero_stage(enum dpi_desync_mode mode) bool desync_valid_zero_stage(enum dpi_desync_mode mode)
{ {
return mode==DESYNC_SYNACK; return mode==DESYNC_SYNACK || mode==DESYNC_SYNDATA;
} }
bool desync_valid_first_stage(enum dpi_desync_mode mode) bool desync_valid_first_stage(enum dpi_desync_mode mode)
{ {
@ -89,6 +89,8 @@ enum dpi_desync_mode desync_mode_from_string(const char *s)
return DESYNC_RSTACK; return DESYNC_RSTACK;
else if (!strcmp(s,"synack")) else if (!strcmp(s,"synack"))
return DESYNC_SYNACK; return DESYNC_SYNACK;
else if (!strcmp(s,"syndata"))
return DESYNC_SYNDATA;
else if (!strcmp(s,"disorder")) else if (!strcmp(s,"disorder"))
return DESYNC_DISORDER; return DESYNC_DISORDER;
else if (!strcmp(s,"disorder2")) else if (!strcmp(s,"disorder2"))
@ -437,18 +439,54 @@ packet_process_result dpi_desync_tcp_packet(uint32_t fwmark, const char *ifout,
extract_endpoints(ip, ip6hdr, tcphdr, NULL, &src, &dst); extract_endpoints(ip, ip6hdr, tcphdr, NULL, &src, &dst);
} }
if (params.desync_mode0==DESYNC_SYNACK && tcp_syn_segment(tcphdr)) if (tcp_syn_segment(tcphdr))
{ {
pkt1_len = sizeof(pkt1); switch (params.desync_mode0)
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, TH_SYN|TH_ACK, tcphdr->th_seq, tcphdr->th_ack, tcphdr->th_win, scale_factor, timestamps,
ttl_fake,params.desync_fooling_mode,params.desync_badseq_increment,params.desync_badseq_ack_increment,
NULL, 0, pkt1, &pkt1_len))
{ {
return res; case DESYNC_SYNACK:
pkt1_len = sizeof(pkt1);
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, TH_SYN|TH_ACK, tcphdr->th_seq, tcphdr->th_ack, tcphdr->th_win, scale_factor, timestamps,
ttl_fake,params.desync_fooling_mode,params.desync_badseq_increment,params.desync_badseq_ack_increment,
NULL, 0, pkt1, &pkt1_len))
{
return res;
}
DLOG("sending fake SYNACK\n");
if (!rawsend_rep((struct sockaddr *)&dst, desync_fwmark, ifout , pkt1, pkt1_len))
return res;
break;
case DESYNC_SYNDATA:
pkt1_len = sizeof(pkt1);
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, tcphdr->th_seq, tcphdr->th_ack, tcphdr->th_win, scale_factor, timestamps,
ttl_orig,0,0,0, params.fake_syndata,params.fake_syndata_size, pkt1,&pkt1_len))
{
return res;
}
DLOG("sending SYN with fake data : ");
hexdump_limited_dlog(params.fake_syndata,params.fake_syndata_size,PKTDATA_MAXDUMP); DLOG("\n")
if (!rawsend_rep((struct sockaddr *)&dst, desync_fwmark, ifout , pkt1, pkt1_len))
return res;
#ifdef __linux__
// if used in postnat chain, dropping SYN will cause conntrack connection teardown
// so we need to workaround this.
// we can't use low ttl because TCP/IP stack listens to ttl expired ICMPs in response to SYN and reset connection
// we also can't use TCP fooling because DPI would accept fooled packets
if (ip)
{
// routers will drop IP frames with invalid checksum
ip->ip_sum ^= htons(0xBEAF);
res=modify;
}
else
// ipv6 does not have checksum
// consider we are free of NAT in ipv6 case. just drop
res=drop;
#else
res=drop;
#endif
break;
} }
DLOG("sending fake SYNACK\n");
if (!rawsend_rep((struct sockaddr *)&dst, desync_fwmark, ifout , pkt1, pkt1_len))
return res;
} }
if (params.desync_cutoff) if (params.desync_cutoff)

1
nfq/desync.h
View File

@ -26,6 +26,7 @@ enum dpi_desync_mode {
DESYNC_RST, DESYNC_RST,
DESYNC_RSTACK, DESYNC_RSTACK,
DESYNC_SYNACK, DESYNC_SYNACK,
DESYNC_SYNDATA,
DESYNC_DISORDER, DESYNC_DISORDER,
DESYNC_DISORDER2, DESYNC_DISORDER2,
DESYNC_SPLIT, DESYNC_SPLIT,

73
nfq/nfqws.c
View File

@ -528,7 +528,7 @@ static void exithelp(void)
" --hostspell\t\t\t\t\t; exact spelling of \"Host\" header. must be 4 chars. default is \"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" " --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" " --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 fake fakeknown rst rstack hopbyhop destopt ipfrag1 disorder disorder2 split split2 ipfrag2 udplen tamper\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__ #ifdef __linux__
" --dpi-desync-fwmark=<int|0xHEX>\t\t; override fwmark for desync packet. default = 0x%08X (%u)\n" " --dpi-desync-fwmark=<int|0xHEX>\t\t; override fwmark for desync packet. default = 0x%08X (%u)\n"
#elif defined(SO_USER_COOKIE) #elif defined(SO_USER_COOKIE)
@ -553,6 +553,7 @@ static void exithelp(void)
" --dpi-desync-fake-http=<filename>|0xHEX\t; file containing fake http request\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-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-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-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-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-dht=<filename>|0xHEX\t\t; file containing DHT protocol fake payload (d1...e)\n"
@ -696,6 +697,7 @@ int main(int argc, char **argv)
params.fake_wg_size = 64; params.fake_wg_size = 64;
params.fake_dht_size = 64; params.fake_dht_size = 64;
params.fake_unknown_size = 256; params.fake_unknown_size = 256;
params.fake_syndata_size = 16;
params.fake_unknown_udp_size = 64; params.fake_unknown_udp_size = 64;
params.wscale=-1; // default - dont change scale factor (client) params.wscale=-1; // default - dont change scale factor (client)
params.ctrack_t_syn = CTRACK_T_SYN; params.ctrack_t_syn = CTRACK_T_SYN;
@ -766,24 +768,25 @@ int main(int argc, char **argv)
{"dpi-desync-fake-http",required_argument,0,0},// optidx=30 {"dpi-desync-fake-http",required_argument,0,0},// optidx=30
{"dpi-desync-fake-tls",required_argument,0,0},// optidx=31 {"dpi-desync-fake-tls",required_argument,0,0},// optidx=31
{"dpi-desync-fake-unknown",required_argument,0,0},// optidx=32 {"dpi-desync-fake-unknown",required_argument,0,0},// optidx=32
{"dpi-desync-fake-quic",required_argument,0,0},// optidx=33 {"dpi-desync-fake-syndata",required_argument,0,0},// optidx=33
{"dpi-desync-fake-wireguard",required_argument,0,0},// optidx=34 {"dpi-desync-fake-quic",required_argument,0,0},// optidx=34
{"dpi-desync-fake-dht",required_argument,0,0},// optidx=35 {"dpi-desync-fake-wireguard",required_argument,0,0},// optidx=35
{"dpi-desync-fake-unknown-udp",required_argument,0,0},// optidx=36 {"dpi-desync-fake-dht",required_argument,0,0},// optidx=36
{"dpi-desync-udplen-increment",required_argument,0,0},// optidx=37 {"dpi-desync-fake-unknown-udp",required_argument,0,0},// optidx=37
{"dpi-desync-udplen-pattern",required_argument,0,0},// optidx=38 {"dpi-desync-udplen-increment",required_argument,0,0},// optidx=38
{"dpi-desync-cutoff",required_argument,0,0},// optidx=39 {"dpi-desync-udplen-pattern",required_argument,0,0},// optidx=39
{"hostlist",required_argument,0,0}, // optidx=40 {"dpi-desync-cutoff",required_argument,0,0},// optidx=40
{"hostlist-exclude",required_argument,0,0}, // optidx=41 {"hostlist",required_argument,0,0}, // optidx=41
{"hostlist-auto",required_argument,0,0}, // optidx=42 {"hostlist-exclude",required_argument,0,0}, // optidx=42
{"hostlist-auto-fail-threshold",required_argument,0,0}, // optidx=43 {"hostlist-auto",required_argument,0,0}, // optidx=43
{"hostlist-auto-fail-time",required_argument,0,0}, // optidx=44 {"hostlist-auto-fail-threshold",required_argument,0,0}, // optidx=44
{"hostlist-auto-retrans-threshold",required_argument,0,0}, // optidx=45 {"hostlist-auto-fail-time",required_argument,0,0}, // optidx=45
{"hostlist-auto-debug",required_argument,0,0}, // optidx=46 {"hostlist-auto-retrans-threshold",required_argument,0,0}, // optidx=46
{"hostlist-auto-debug",required_argument,0,0}, // optidx=47
#ifdef __linux__ #ifdef __linux__
{"bind-fix4",no_argument,0,0}, // optidx=47 {"bind-fix4",no_argument,0,0}, // optidx=48
{"bind-fix6",no_argument,0,0}, // optidx=48 {"bind-fix6",no_argument,0,0}, // optidx=49
#endif #endif
{NULL,0,NULL,0} {NULL,0,NULL,0}
}; };
@ -1077,30 +1080,34 @@ int main(int argc, char **argv)
params.fake_unknown_size = sizeof(params.fake_unknown); params.fake_unknown_size = sizeof(params.fake_unknown);
load_file_or_exit(optarg,params.fake_unknown,&params.fake_unknown_size); load_file_or_exit(optarg,params.fake_unknown,&params.fake_unknown_size);
break; break;
case 33: /* dpi-desync-fake-quic */ case 33: /* dpi-desync-fake-syndata */
params.fake_syndata_size = sizeof(params.fake_syndata);
load_file_or_exit(optarg,params.fake_syndata,&params.fake_syndata_size);
break;
case 34: /* dpi-desync-fake-quic */
params.fake_quic_size = sizeof(params.fake_quic); params.fake_quic_size = sizeof(params.fake_quic);
load_file_or_exit(optarg,params.fake_quic,&params.fake_quic_size); load_file_or_exit(optarg,params.fake_quic,&params.fake_quic_size);
break; break;
case 34: /* dpi-desync-fake-wireguard */ case 35: /* dpi-desync-fake-wireguard */
params.fake_wg_size = sizeof(params.fake_wg); params.fake_wg_size = sizeof(params.fake_wg);
load_file_or_exit(optarg,params.fake_wg,&params.fake_wg_size); load_file_or_exit(optarg,params.fake_wg,&params.fake_wg_size);
break; break;
case 35: /* dpi-desync-fake-dht */ case 36: /* dpi-desync-fake-dht */
params.fake_dht_size = sizeof(params.fake_dht); params.fake_dht_size = sizeof(params.fake_dht);
load_file_or_exit(optarg,params.fake_dht,&params.fake_dht_size); load_file_or_exit(optarg,params.fake_dht,&params.fake_dht_size);
break; break;
case 36: /* dpi-desync-fake-unknown-udp */ case 37: /* dpi-desync-fake-unknown-udp */
params.fake_unknown_udp_size = sizeof(params.fake_unknown_udp); params.fake_unknown_udp_size = sizeof(params.fake_unknown_udp);
load_file_or_exit(optarg,params.fake_unknown_udp,&params.fake_unknown_udp_size); load_file_or_exit(optarg,params.fake_unknown_udp,&params.fake_unknown_udp_size);
break; break;
case 37: /* dpi-desync-udplen-increment */ case 38: /* dpi-desync-udplen-increment */
if (sscanf(optarg,"%d",&params.udplen_increment)<1 || params.udplen_increment>0x7FFF || params.udplen_increment<-0x8000) if (sscanf(optarg,"%d",&params.udplen_increment)<1 || params.udplen_increment>0x7FFF || params.udplen_increment<-0x8000)
{ {
fprintf(stderr, "dpi-desync-udplen-increment must be integer within -32768..32767 range\n"); fprintf(stderr, "dpi-desync-udplen-increment must be integer within -32768..32767 range\n");
exit_clean(1); exit_clean(1);
} }
break; break;
case 38: /* dpi-desync-udplen-pattern */ case 39: /* dpi-desync-udplen-pattern */
{ {
char buf[sizeof(params.udplen_pattern)]; char buf[sizeof(params.udplen_pattern)];
size_t sz=sizeof(buf); size_t sz=sizeof(buf);
@ -1108,28 +1115,28 @@ int main(int argc, char **argv)
fill_pattern(params.udplen_pattern,sizeof(params.udplen_pattern),buf,sz); fill_pattern(params.udplen_pattern,sizeof(params.udplen_pattern),buf,sz);
} }
break; break;
case 39: /* desync-cutoff */ case 40: /* desync-cutoff */
if (!parse_cutoff(optarg, &params.desync_cutoff, &params.desync_cutoff_mode)) if (!parse_cutoff(optarg, &params.desync_cutoff, &params.desync_cutoff_mode))
{ {
fprintf(stderr, "invalid desync-cutoff value\n"); fprintf(stderr, "invalid desync-cutoff value\n");
exit_clean(1); exit_clean(1);
} }
break; break;
case 40: /* hostlist */ case 41: /* hostlist */
if (!strlist_add(&params.hostlist_files, optarg)) if (!strlist_add(&params.hostlist_files, optarg))
{ {
fprintf(stderr, "strlist_add failed\n"); fprintf(stderr, "strlist_add failed\n");
exit_clean(1); exit_clean(1);
} }
break; break;
case 41: /* hostlist-exclude */ case 42: /* hostlist-exclude */
if (!strlist_add(&params.hostlist_exclude_files, optarg)) if (!strlist_add(&params.hostlist_exclude_files, optarg))
{ {
fprintf(stderr, "strlist_add failed\n"); fprintf(stderr, "strlist_add failed\n");
exit_clean(1); exit_clean(1);
} }
break; break;
case 42: /* hostlist-auto */ case 43: /* hostlist-auto */
if (*params.hostlist_auto_filename) if (*params.hostlist_auto_filename)
{ {
fprintf(stderr, "only one auto hostlist is supported\n"); fprintf(stderr, "only one auto hostlist is supported\n");
@ -1160,7 +1167,7 @@ int main(int argc, char **argv)
strncpy(params.hostlist_auto_filename, optarg, sizeof(params.hostlist_auto_filename)); strncpy(params.hostlist_auto_filename, optarg, sizeof(params.hostlist_auto_filename));
params.hostlist_auto_filename[sizeof(params.hostlist_auto_filename) - 1] = '\0'; params.hostlist_auto_filename[sizeof(params.hostlist_auto_filename) - 1] = '\0';
break; break;
case 43: /* hostlist-auto-fail-threshold */ case 44: /* hostlist-auto-fail-threshold */
params.hostlist_auto_fail_threshold = (uint8_t)atoi(optarg); params.hostlist_auto_fail_threshold = (uint8_t)atoi(optarg);
if (params.hostlist_auto_fail_threshold<1 || params.hostlist_auto_fail_threshold>20) if (params.hostlist_auto_fail_threshold<1 || params.hostlist_auto_fail_threshold>20)
{ {
@ -1168,7 +1175,7 @@ int main(int argc, char **argv)
exit_clean(1); exit_clean(1);
} }
break; break;
case 44: /* hostlist-auto-fail-time */ case 45: /* hostlist-auto-fail-time */
params.hostlist_auto_fail_time = (uint8_t)atoi(optarg); params.hostlist_auto_fail_time = (uint8_t)atoi(optarg);
if (params.hostlist_auto_fail_time<1) if (params.hostlist_auto_fail_time<1)
{ {
@ -1176,7 +1183,7 @@ int main(int argc, char **argv)
exit_clean(1); exit_clean(1);
} }
break; break;
case 45: /* hostlist-auto-retrans-threshold */ case 46: /* hostlist-auto-retrans-threshold */
params.hostlist_auto_retrans_threshold = (uint8_t)atoi(optarg); params.hostlist_auto_retrans_threshold = (uint8_t)atoi(optarg);
if (params.hostlist_auto_retrans_threshold<2 || params.hostlist_auto_retrans_threshold>10) if (params.hostlist_auto_retrans_threshold<2 || params.hostlist_auto_retrans_threshold>10)
{ {
@ -1184,7 +1191,7 @@ int main(int argc, char **argv)
exit_clean(1); exit_clean(1);
} }
break; break;
case 46: /* hostlist-auto-debug */ case 47: /* hostlist-auto-debug */
{ {
FILE *F = fopen(optarg,"a+t"); FILE *F = fopen(optarg,"a+t");
if (!F) if (!F)
@ -1200,10 +1207,10 @@ int main(int argc, char **argv)
} }
break; break;
#ifdef __linux__ #ifdef __linux__
case 47: /* bind-fix4 */ case 48: /* bind-fix4 */
params.bind_fix4 = true; params.bind_fix4 = true;
break; break;
case 48: /* bind-fix6 */ case 49: /* bind-fix6 */
params.bind_fix6 = true; params.bind_fix6 = true;
break; break;
#endif #endif

5
nfq/params.h
View File

@ -56,8 +56,9 @@ struct params_s
uint32_t desync_fooling_mode; uint32_t desync_fooling_mode;
uint32_t desync_fwmark; // unused in BSD uint32_t desync_fwmark; // unused in BSD
uint32_t desync_badseq_increment, desync_badseq_ack_increment; uint32_t desync_badseq_increment, desync_badseq_ack_increment;
uint8_t fake_http[1432],fake_tls[1432],fake_quic[1472],fake_wg[1472],fake_dht[1472],fake_unknown[1432],fake_unknown_udp[1472], udplen_pattern[1472]; uint8_t fake_http[1460],fake_tls[1460],fake_unknown[1460],fake_syndata[1460];
size_t fake_http_size,fake_tls_size,fake_quic_size,fake_wg_size,fake_dht_size,fake_unknown_size,fake_unknown_udp_size; uint8_t fake_unknown_udp[1472],udplen_pattern[1472],fake_quic[1472],fake_wg[1472],fake_dht[1472];
size_t fake_http_size,fake_tls_size,fake_quic_size,fake_wg_size,fake_dht_size,fake_unknown_size,fake_syndata_size,fake_unknown_udp_size;
int udplen_increment; int udplen_increment;
bool droproot; bool droproot;
uid_t uid; uid_t uid;