byedpi/main.c

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C
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
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#include <limits.h>
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#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <params.h>
#include <proxy.h>
#include <packets.h>
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#define VERSION 2
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struct packet fake_tls = {
sizeof(tls_data), tls_data
},
fake_http = {
sizeof(http_data), http_data
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},
fake_udp = {
sizeof(udp_data), udp_data
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};
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struct params params = {
.ttl = 8,
.split = 3,
.sfdelay = 3000,
.attack = DESYNC_NONE,
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.desync_udp = 0,
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.split_host = 0,
.def_ttl = 0,
.mod_http = 0,
.ipv6 = 1,
.resolve = 1,
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.udp = 1,
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.de_known = 0,
.max_open = 512,
.bfsize = 16384,
.send_bfsz = 65536,
.debug = 0
};
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char *ftob(char *name, ssize_t *sl)
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{
char *buffer = 0;
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long size;
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FILE *file = fopen(name, "rb");
if (!file)
return 0;
do {
if (fseek(file, 0, SEEK_END)) {
break;
}
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size = ftell(file);
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if (!size || fseek(file, 0, SEEK_SET)) {
break;
}
if (!(buffer = malloc(size))) {
break;
}
if (fread(buffer, 1, size, file) != size) {
free(buffer);
buffer = 0;
}
} while (0);
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if (buffer) {
*sl = size;
}
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fclose(file);
return buffer;
}
void daemonize(void)
{
pid_t pid = fork();
if (pid < 0) {
perror("fork");
exit(1);
}
else if (pid) {
exit(0);
}
if (setsid() < 0) {
exit(1);
}
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
open("/dev/null", O_RDWR);
dup(0);
dup(0);
}
int main(int argc, char **argv)
{
struct sockaddr_ina s = {
.in = {
.sin_family = AF_INET,
.sin_port = htons(1080)
}};
char daemon = 0;
char *pidfile = 0;
const char help_text[] = {
//"Proxy:\n"
" -i, --ip, <ip> Listening IP address\n"
" -p, --port <num> Listening port num\n"
" -D, --daemon Daemonize\n"
" -f, --pidfile <file> Write pid to file\n"
" -c, --max-conn <count> Connection count limit, default 512\n"
" -N, --no-domain Deny domain resolving\n"
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" -U, --no-udp Deny UDP associate\n"
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" -K, --desync-known Desync only HTTP and TLS with SNI\n"
//"Desync:\n"
" -m, --method <s|d|f> Desync method: split,disorder,fake\n"
" -s, --split-pos <offset> Split position, default 3\n"
" -H, --split-at-host Add Host/SNI offset to split position\n"
" -t, --ttl <num> TTL of fake packets, default 8\n"
" -l, --fake-tls <file>\n"
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" -o, --fake-http <file>\n"
" -e, --fake-udp <file> Set custom fake packet\n"
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" -n, --tls-sni <str> Change SNI in fake CH\n"
" -M, --mod-http <h,d,r> Modify http: hcsmix,dcsmix,rmspace\n"
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" -u, --desync-udp <f> UDP desync method: fake\n"
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};
const struct option options[] = {
{"daemon", 0, 0, 'D'},
{"no-domain", 0, 0, 'N'},
{"no-ipv6", 0, 0, 'X'}, //
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{"no-udp", 0, 0, 'U'},
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{"desync-known ", 0, 0, 'K'},
{"split-at-host", 0, 0, 'H'},
{"help", 0, 0, 'h'},
{"version", 0, 0, 'v'},
{"pidfile", 1, 0, 'f'},
{"ip", 1, 0, 'i'},
{"port", 1, 0, 'p'},
{"bfs", 1, 0, 'b'}, //
{"snd-bfs", 1, 0, 'B'}, //
{"max-conn", 1, 0, 'c'},
{"method", 1, 0, 'm'},
{"split-pos", 1, 0, 's'},
{"ttl", 1, 0, 't'},
{"fake-tls", 1, 0, 'l'},
{"fake-http", 1, 0, 'o'},
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{"fake-udp", 1, 0, 'e'},
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{"tls-sni", 1, 0, 'n'},
{"mod-http", 1, 0, 'M'},
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{"desync-udp", 1, 0, 'u'},
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{"global-ttl", 1, 0, 'g'}, //
{"delay", 1, 0, 'w'}, //
{"debug", 1, 0, 'x'}, //
{0}
};
int rez;
int invalid = 0;
long val = 0;
char *end = 0;
while (!invalid && (rez = getopt_long_only(argc, argv,
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"DNXUKHhvf:i:p:b:B:c:m:s:t:l:o:e:n:M:u:g:w:x:", options, 0)) != -1) {
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switch (rez) {
case 'D':
daemon = 1;
break;
case 'f':
pidfile = optarg;
break;
case 'N':
params.resolve = 0;
break;
case 'X':
params.ipv6 = 0;
break;
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case 'U':
params.udp = 0;
break;
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case 'K':
params.de_known = 1;
break;
case 'h':
printf(help_text);
return 0;
case 'v':
printf("%d\n", VERSION);
return 0;
case 'b': //
val = strtol(optarg, &end, 0);
if (val <= 0 || val > INT_MAX/4 || *end)
invalid = 1;
else
params.bfsize = val;
break;
case 'B': //
val = strtol(optarg, &end, 0);
if (val <= 0 || val > INT_MAX || *end)
invalid = 1;
else
params.send_bfsz = val;
break;
case 'i':
if (strchr(optarg, ':'))
s.in.sin_family = AF_INET6;
else
s.in.sin_family = AF_INET;
if (!inet_pton(s.in.sin_family, optarg,
(s.in.sin_family == AF_INET ?
(char *)&s.in.sin_addr : (char *)&s.in6.sin6_addr)))
invalid = 1;
break;
case 'p':
val = strtol(optarg, &end, 0);
if (val <= 0 || val > 0xffff || *end)
invalid = 1;
else
s.in.sin_port = htons(val);
break;
case 'c':
val = strtol(optarg, &end, 0);
if (val <= 0 || val >= (0xffff/2) || *end)
invalid = 1;
else
params.max_open = val;
break;
case 'm':
if (params.attack != DESYNC_NONE) {
fprintf(stderr, "methods incompatible\n");
invalid = 1;
}
else switch (*optarg) {
case 's':
params.attack = DESYNC_SPLIT;
break;
case 'd':
params.attack = DESYNC_DISORDER;
break;
case 'f':
params.attack = DESYNC_FAKE;
break;
default:
invalid = 1;
}
break;
case 's':
val = strtol(optarg, &end, 0);
if (val < INT_MIN || val > INT_MAX || *end)
invalid = 1;
else
params.split = val;
break;
case 'H':
params.split_host = 1;
break;
case 't':
val = strtol(optarg, &end, 0);
if (val <= 0 || val > 255 || *end)
invalid = 1;
else
params.ttl = val;
break;
case 'n':
if (change_tls_sni(optarg, fake_tls.data, fake_tls.size)) {
fprintf(stderr, "error chsni\n");
return -1;
}
printf("sni: %s\n", optarg);
break;
case 'l':
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fake_tls.data = ftob(optarg, &fake_tls.size);
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if (!fake_tls.data) {
perror("read file");
return -1;
}
break;
case 'o':
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fake_http.data = ftob(optarg, &fake_http.size);
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if (!fake_http.data) {
perror("read file");
return -1;
}
break;
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case 'e':
fake_udp.data = ftob(optarg, &fake_udp.size);
if (!fake_udp.data) {
perror("read file");
return -1;
}
break;
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case 'M':
end = optarg;
while (end && !invalid) {
switch (*end) {
case 'r':
params.mod_http |= MH_SPACE;
break;
case 'h':
params.mod_http |= MH_HMIX;
break;
case 'd':
params.mod_http |= MH_DMIX;
break;
default:
invalid = 1;
continue;
}
end = strchr(end, ',');
if (end) end++;
}
break;
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case 'u':
if (*optarg != 'f')
invalid = 1;
else
params.desync_udp = DESYNC_UDP_FAKE;
break;
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case 'g': //
val = strtol(optarg, &end, 0);
if (val <= 0 || val > 255 || *end)
invalid = 1;
else
params.def_ttl = val;
break;
case 'w': //
params.sfdelay = strtoul(optarg, &end, 0);
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if (optarg == end || params.sfdelay > 1000000 || *end)
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invalid = 1;
break;
case 'x': //
params.debug = strtol(optarg, 0, 0);
if (params.debug < 0)
invalid = 1;
break;
case 0:
break;
case '?':
return -1;
default:
printf("?: %c\n", rez);
return -1;
}
}
if (invalid) {
fprintf(stderr, "invalid value: -%c %s\n", rez, optarg);
return -1;
}
if (params.send_bfsz * 2 <= params.bfsize) {
fprintf(stderr, "send buffer too small\n");
return -1;
}
FILE *file;
if (pidfile) {
file = fopen(pidfile, "w");
if (!file) {
perror("fopen");
return -1;
}
}
if (daemon) {
daemonize();
}
if (pidfile) {
fprintf(file, "%d", getpid());
fclose(file);
}
if (!params.def_ttl) {
int orig_ttl, fd;
socklen_t tsize = sizeof(orig_ttl);
if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("socket");
return -1;
}
if (getsockopt(fd, IPPROTO_IP, IP_TTL,
(char *)&orig_ttl, &tsize) < 0) {
perror("getsockopt IP_TTL");
close(fd);
return -1;
}
close(fd);
params.def_ttl = orig_ttl;
}
return listener(s);
}