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zapret/tpws/tpws.c

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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <net/if.h>
#include <ifaddrs.h>
#include <netdb.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/select.h>
#include <fcntl.h>
#include <stdint.h>
#include <sys/ioctl.h>
#include <signal.h>
#include <errno.h>
#include <stdbool.h>
#include <netinet/tcp.h>
#include <getopt.h>
#include <pwd.h>
#include <sys/resource.h>
#include <time.h>
#include <syslog.h>
#include "tpws.h"
#ifdef BSD
#include <sys/sysctl.h>
#endif
#include "tpws_conn.h"
#include "hostlist.h"
#include "ipset.h"
#include "params.h"
#include "sec.h"
#include "redirect.h"
#include "helpers.h"
#include "gzip.h"
#include "pools.h"
struct params_s params;
static void onhup(int sig)
{
printf("HUP received !\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 int8_t block_sigpipe(void)
{
sigset_t sigset;
memset(&sigset, 0, sizeof(sigset));
//Get the old sigset, add SIGPIPE and update sigset
if (sigprocmask(SIG_BLOCK, NULL, &sigset) == -1) {
DLOG_PERROR("sigprocmask (get)");
return -1;
}
if (sigaddset(&sigset, SIGPIPE) == -1) {
DLOG_PERROR("sigaddset");
return -1;
}
if (sigprocmask(SIG_BLOCK, &sigset, NULL) == -1) {
DLOG_PERROR("sigprocmask (set)");
return -1;
}
return 0;
}
static bool is_interface_online(const char *ifname)
{
struct ifreq ifr;
int sock;
if ((sock=socket(PF_INET, SOCK_DGRAM, IPPROTO_IP))==-1)
return false;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
ifr.ifr_name[IFNAMSIZ-1] = 0;
ioctl(sock, SIOCGIFFLAGS, &ifr);
close(sock);
return !!(ifr.ifr_flags & IFF_UP);
}
static int get_default_ttl(void)
{
int sock,ttl=0;
socklen_t optlen=sizeof(ttl);
if ((sock=socket(PF_INET, SOCK_DGRAM, IPPROTO_IP))!=-1)
{
getsockopt(sock, IPPROTO_IP, IP_TTL, &ttl, &optlen);
close(sock);
}
return ttl;
}
static void exithelp(void)
{
printf(
" --bind-addr=<v4_addr>|<v6_addr>\t; for v6 link locals append %%interface_name\n"
" --bind-iface4=<interface_name>\t\t; bind to the first ipv4 addr of interface\n"
" --bind-iface6=<interface_name>\t\t; bind to the first ipv6 addr of interface\n"
" --bind-linklocal=no|unwanted|prefer|force ; prohibit, accept, prefer or force ipv6 link local bind\n"
" --bind-wait-ifup=<sec>\t\t\t; wait for interface to appear and up\n"
" --bind-wait-ip=<sec>\t\t\t; after ifup wait for ip address to appear up to N seconds\n"
" --bind-wait-ip-linklocal=<sec>\t\t; (prefer) accept only LL first N seconds then any (unwanted) accept only globals first N seconds then LL\n"
" --bind-wait-only\t\t\t; wait for bind conditions satisfaction then exit. return code 0 if success.\n"
" * multiple binds are supported. each bind-addr, bind-iface* start new bind\n"
" --connect-bind-addr=<v4_addr>|<v6_addr> ; address for outbound connections. for v6 link locals append %%interface_name\n"
" --port=<port>\t\t\t\t; only one port number for all binds is supported\n"
" --socks\t\t\t\t; implement socks4/5 proxy instead of transparent proxy\n"
" --no-resolve\t\t\t\t; disable socks5 remote dns ability\n"
" --resolver-threads=<int>\t\t; number of resolver worker threads\n"
" --local-rcvbuf=<bytes>\n"
" --local-sndbuf=<bytes>\n"
" --remote-rcvbuf=<bytes>\n"
" --remote-sndbuf=<bytes>\n"
#ifdef SPLICE_PRESENT
" --nosplice\t\t\t\t; do not use splice to transfer data between sockets\n"
#endif
" --skip-nodelay\t\t\t\t; do not set TCP_NODELAY option for outgoing connections (incompatible with split options)\n"
#if defined(__linux__) || defined(__APPLE__)
" --local-tcp-user-timeout=<seconds>\t; set tcp user timeout for local leg (default : %d, 0 = system default)\n"
" --remote-tcp-user-timeout=<seconds>\t; set tcp user timeout for remote leg (default : %d, 0 = system default)\n"
#endif
" --maxconn=<max_connections>\n"
#ifdef SPLICE_PRESENT
" --maxfiles=<max_open_files>\t\t; should be at least (X*connections+16), where X=6 in tcp proxy mode, X=4 in tampering mode\n"
#else
" --maxfiles=<max_open_files>\t\t; should be at least (connections*2+16)\n"
#endif
" --max-orphan-time=<sec>\t\t; if local leg sends something and closes and remote leg is still connecting then cancel connection attempt after N seconds\n"
" --daemon\t\t\t\t; daemonize\n"
" --pidfile=<filename>\t\t\t; write pid to file\n"
" --user=<username>\t\t\t; drop root privs\n"
" --uid=uid[:gid]\t\t\t; drop root privs\n"
#if defined(__FreeBSD__)
" --enable-pf\t\t\t\t; enable PF redirector support. required in FreeBSD when used with PF firewall.\n"
#endif
" --debug=0|1|2|syslog|@<filename>\t; 1 and 2 means log to console and set debug level. for other targets use --debug-level.\n"
" --debug-level=0|1|2\t\t\t; specify debug level\n"
"\nMULTI-STRATEGY:\n"
" --new\t\t\t\t\t; begin new strategy\n"
" --filter-l3=ipv4|ipv6\t\t\t; L3 protocol filter. multiple comma separated values allowed.\n"
" --filter-tcp=[~]port1[-port2]|*\t; TCP port filter. ~ means negation. multiple comma separated values allowed.\n"
" --filter-l7=[http|tls|unknown]\t\t; L6-L7 protocol filter. multiple comma separated values allowed.\n"
" --ipset=<filename>\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; 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; only act on hosts in the list (one host per line, subdomains auto apply, gzip supported, multiple hostlists allowed)\n"
" --hostlist-exclude=<filename>\t\t; do not act on hosts in the list (one host per line, subdomains auto apply, gzip supported, multiple hostlists allowed)\n"
" --hostlist-auto=<filename>\t\t; detect DPI blocks and build hostlist automatically\n"
" --hostlist-auto-fail-threshold=<int>\t; how many failed attempts cause hostname to be added to auto hostlist (default : %d)\n"
" --hostlist-auto-fail-time=<int>\t; all failed attemps must be within these seconds (default : %d)\n"
" --hostlist-auto-debug=<logfile>\t; debug auto hostlist positives\n"
"\nTAMPER:\n"
" --split-http-req=method|host\t\t; split at specified logical part of plain http request\n"
" --split-tls=sni|sniext\t\t\t; split at specified logical part of TLS ClientHello\n"
" --split-pos=<numeric_offset>\t\t; split at specified pos. split-http-req or split-tls take precedence for http.\n"
" --split-any-protocol\t\t\t; split not only http and https\n"
#if defined(BSD) && !defined(__APPLE__)
" --disorder[=http|tls]\t\t\t; when splitting simulate sending second fragment first (BSD sends entire message instead of first fragment, this is not good)\n"
#else
" --disorder[=http|tls]\t\t\t; when splitting simulate sending second fragment first\n"
#endif
" --oob[=http|tls]\t\t\t; when splitting send out of band byte. default is HEX 0x00.\n"
" --oob-data=<char>|0xHEX\t\t; override default 0x00 OOB byte.\n"
" --hostcase\t\t\t\t; change Host: => host:\n"
" --hostspell\t\t\t\t; exact spelling of \"Host\" header. must be 4 chars. default is \"host\"\n"
" --hostdot\t\t\t\t; add \".\" after Host: name\n"
" --hosttab\t\t\t\t; add tab after Host: name\n"
" --hostnospace\t\t\t\t; remove space after Host:\n"
" --hostpad=<bytes>\t\t\t; add dummy padding headers before Host:\n"
" --domcase\t\t\t\t; mix domain case : Host: TeSt.cOm\n"
" --methodspace\t\t\t\t; add extra space after method\n"
" --methodeol\t\t\t\t; add end-of-line before method\n"
" --unixeol\t\t\t\t; replace 0D0A to 0A\n"
" --tlsrec=sni|sniext\t\t\t; make 2 TLS records. split at specified logical part. don't split if SNI is not present\n"
" --tlsrec-pos=<pos>\t\t\t; make 2 TLS records. split at specified pos\n"
#ifdef __linux__
" --mss=<int>\t\t\t\t; set client MSS. forces server to split messages but significantly decreases speed !\n"
#endif
" --tamper-start=[n]<pos>\t\t; start tampering only from specified outbound stream position. default is 0. 'n' means data block number.\n"
" --tamper-cutoff=[n]<pos>\t\t; do not tamper anymore after specified outbound stream position. default is unlimited.\n",
#if defined(__linux__) || defined(__APPLE__)
DEFAULT_TCP_USER_TIMEOUT_LOCAL,DEFAULT_TCP_USER_TIMEOUT_REMOTE,
#endif
HOSTLIST_AUTO_FAIL_THRESHOLD_DEFAULT, HOSTLIST_AUTO_FAIL_TIME_DEFAULT
);
exit(1);
}
static void cleanup_params(void)
{
dp_list_destroy(&params.desync_profiles);
hostlist_files_destroy(&params.hostlists);
ipset_files_destroy(&params.ipsets);
}
static void exithelp_clean(void)
{
cleanup_params();
exithelp();
}
static void exit_clean(int code)
{
cleanup_params();
exit(code);
}
static void nextbind_clean(void)
{
params.binds_last++;
if (params.binds_last>=MAX_BINDS)
{
DLOG_ERR("maximum of %d binds are supported\n",MAX_BINDS);
exit_clean(1);
}
}
static void checkbind_clean(void)
{
if (params.binds_last<0)
{
DLOG_ERR("start new bind with --bind-addr,--bind-iface*\n");
exit_clean(1);
}
}
void save_default_ttl(void)
{
if (!params.ttl_default)
{
params.ttl_default = get_default_ttl();
if (!params.ttl_default)
{
DLOG_ERR("could not get default ttl\n");
exit_clean(1);
}
}
}
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;
}
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;
}
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,"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;
}
void parse_params(int argc, char *argv[])
{
int option_index = 0;
int v, i;
memset(&params, 0, sizeof(params));
params.maxconn = DEFAULT_MAX_CONN;
params.max_orphan_time = DEFAULT_MAX_ORPHAN_TIME;
params.binds_last = -1;
#if defined(__linux__) || defined(__APPLE__)
params.tcp_user_timeout_local = DEFAULT_TCP_USER_TIMEOUT_LOCAL;
params.tcp_user_timeout_remote = DEFAULT_TCP_USER_TIMEOUT_REMOTE;
#endif
#if defined(__OpenBSD__) || defined(__APPLE__)
params.pf_enable = true; // OpenBSD and MacOS have no other choice
#endif
LIST_INIT(&params.hostlists);
LIST_INIT(&params.ipsets);
if (can_drop_root())
{
params.uid = params.gid = 0x7FFFFFFF; // default uid:gid
params.droproot = true;
}
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;
const struct option long_options[] = {
{ "help",no_argument,0,0 },// optidx=0
{ "h",no_argument,0,0 },// optidx=1
{ "bind-addr",required_argument,0,0 },// optidx=2
{ "bind-iface4",required_argument,0,0 },// optidx=3
{ "bind-iface6",required_argument,0,0 },// optidx=4
{ "bind-linklocal",required_argument,0,0 },// optidx=5
{ "bind-wait-ifup",required_argument,0,0 },// optidx=6
{ "bind-wait-ip",required_argument,0,0 },// optidx=7
{ "bind-wait-ip-linklocal",required_argument,0,0 },// optidx=8
{ "bind-wait-only",no_argument,0,0 },// optidx=9
{ "port",required_argument,0,0 },// optidx=10
{ "daemon",no_argument,0,0 },// optidx=11
{ "user",required_argument,0,0 },// optidx=12
{ "uid",required_argument,0,0 },// optidx=13
{ "maxconn",required_argument,0,0 },// optidx=14
{ "maxfiles",required_argument,0,0 },// optidx=15
{ "max-orphan-time",required_argument,0,0 },// optidx=16
{ "hostcase",no_argument,0,0 },// optidx=17
{ "hostspell",required_argument,0,0 },// optidx=18
{ "hostdot",no_argument,0,0 },// optidx=19
{ "hostnospace",no_argument,0,0 },// optidx=20
{ "hostpad",required_argument,0,0 },// optidx=21
{ "domcase",no_argument,0,0 },// optidx=22
{ "split-http-req",required_argument,0,0 },// optidx=23
{ "split-tls",required_argument,0,0 },// optidx=24
{ "split-pos",required_argument,0,0 },// optidx=25
{ "split-any-protocol",optional_argument,0,0},// optidx=26
{ "disorder",optional_argument,0,0 },// optidx=27
{ "oob",optional_argument,0,0 },// optidx=28
{ "oob-data",required_argument,0,0 },// optidx=29
{ "methodspace",no_argument,0,0 },// optidx=30
{ "methodeol",no_argument,0,0 },// optidx=31
{ "hosttab",no_argument,0,0 },// optidx=32
{ "unixeol",no_argument,0,0 },// optidx=33
{ "tlsrec",required_argument,0,0 },// optidx=34
{ "tlsrec-pos",required_argument,0,0 },// optidx=35
{ "hostlist",required_argument,0,0 },// optidx=36
{ "hostlist-exclude",required_argument,0,0 },// optidx=37
{ "hostlist-auto",required_argument,0,0}, // optidx=38
{ "hostlist-auto-fail-threshold",required_argument,0,0}, // optidx=39
{ "hostlist-auto-fail-time",required_argument,0,0}, // optidx=40
{ "hostlist-auto-debug",required_argument,0,0}, // optidx=41
{ "pidfile",required_argument,0,0 },// optidx=42
{ "debug",optional_argument,0,0 },// optidx=43
{ "debug-level",required_argument,0,0 },// optidx=44
{ "local-rcvbuf",required_argument,0,0 },// optidx=45
{ "local-sndbuf",required_argument,0,0 },// optidx=46
{ "remote-rcvbuf",required_argument,0,0 },// optidx=47
{ "remote-sndbuf",required_argument,0,0 },// optidx=48
{ "socks",no_argument,0,0 },// optidx=40
{ "no-resolve",no_argument,0,0 },// optidx=50
{ "resolver-threads",required_argument,0,0 },// optidx=51
{ "skip-nodelay",no_argument,0,0 },// optidx=52
{ "tamper-start",required_argument,0,0 },// optidx=53
{ "tamper-cutoff",required_argument,0,0 },// optidx=54
{ "connect-bind-addr",required_argument,0,0 },// optidx=55
{ "new",no_argument,0,0 }, // optidx=56
{ "filter-l3",required_argument,0,0 }, // optidx=57
{ "filter-tcp",required_argument,0,0 }, // optidx=58
{ "filter-l7",required_argument,0,0 }, // optidx=59
{ "ipset",required_argument,0,0 }, // optidx=60
{ "ipset-exclude",required_argument,0,0 }, // optidx=61
#if defined(__FreeBSD__)
{ "enable-pf",no_argument,0,0 },// optidx=62
#elif defined(__APPLE__)
{ "local-tcp-user-timeout",required_argument,0,0 }, // optidx=62
{ "remote-tcp-user-timeout",required_argument,0,0 }, // optidx=63
#elif defined(__linux__)
{ "local-tcp-user-timeout",required_argument,0,0 }, // optidx=62
{ "remote-tcp-user-timeout",required_argument,0,0 }, // optidx=63
{ "mss",required_argument,0,0 }, // optidx=64
#ifdef SPLICE_PRESENT
{ "nosplice",no_argument,0,0 }, // optidx=65
#endif
#endif
{ "hostlist-auto-retrans-threshold",optional_argument,0,0}, // ignored. for nfqws command line compatibility
{ NULL,0,NULL,0 }
};
while ((v = getopt_long_only(argc, argv, "", long_options, &option_index)) != -1)
{
if (v) exithelp_clean();
switch (option_index)
{
case 0:
case 1:
exithelp_clean();
break;
case 2: /* bind-addr */
nextbind_clean();
{
char *p = strchr(optarg,'%');
if (p)
{
*p=0;
strncpy(params.binds[params.binds_last].bindiface, p+1, sizeof(params.binds[params.binds_last].bindiface));
}
strncpy(params.binds[params.binds_last].bindaddr, optarg, sizeof(params.binds[params.binds_last].bindaddr));
}
params.binds[params.binds_last].bindaddr[sizeof(params.binds[params.binds_last].bindaddr) - 1] = 0;
break;
case 3: /* bind-iface4 */
nextbind_clean();
params.binds[params.binds_last].bind_if6=false;
strncpy(params.binds[params.binds_last].bindiface, optarg, sizeof(params.binds[params.binds_last].bindiface));
params.binds[params.binds_last].bindiface[sizeof(params.binds[params.binds_last].bindiface) - 1] = 0;
break;
case 4: /* bind-iface6 */
nextbind_clean();
params.binds[params.binds_last].bind_if6=true;
strncpy(params.binds[params.binds_last].bindiface, optarg, sizeof(params.binds[params.binds_last].bindiface));
params.binds[params.binds_last].bindiface[sizeof(params.binds[params.binds_last].bindiface) - 1] = 0;
break;
case 5: /* bind-linklocal */
checkbind_clean();
params.binds[params.binds_last].bindll = true;
if (!strcmp(optarg, "no"))
params.binds[params.binds_last].bindll=no;
else if (!strcmp(optarg, "prefer"))
params.binds[params.binds_last].bindll=prefer;
else if (!strcmp(optarg, "force"))
params.binds[params.binds_last].bindll=force;
else if (!strcmp(optarg, "unwanted"))
params.binds[params.binds_last].bindll=unwanted;
else
{
DLOG_ERR("invalid parameter in bind-linklocal : %s\n",optarg);
exit_clean(1);
}
break;
case 6: /* bind-wait-ifup */
checkbind_clean();
params.binds[params.binds_last].bind_wait_ifup = atoi(optarg);
break;
case 7: /* bind-wait-ip */
checkbind_clean();
params.binds[params.binds_last].bind_wait_ip = atoi(optarg);
break;
case 8: /* bind-wait-ip-linklocal */
checkbind_clean();
params.binds[params.binds_last].bind_wait_ip_ll = atoi(optarg);
break;
case 9: /* bind-wait-only */
params.bind_wait_only = true;
break;
case 10: /* port */
i = atoi(optarg);
if (i <= 0 || i > 65535)
{
DLOG_ERR("bad port number\n");
exit_clean(1);
}
params.port = (uint16_t)i;
break;
case 11: /* daemon */
params.daemon = true;
break;
case 12: /* 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 13: /* uid */
params.gid=0x7FFFFFFF; // default git. 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;
case 14: /* maxconn */
params.maxconn = atoi(optarg);
if (params.maxconn <= 0 || params.maxconn > 10000)
{
DLOG_ERR("bad maxconn\n");
exit_clean(1);
}
break;
case 15: /* maxfiles */
params.maxfiles = atoi(optarg);
if (params.maxfiles < 0)
{
DLOG_ERR("bad maxfiles\n");
exit_clean(1);
}
break;
case 16: /* max-orphan-time */
params.max_orphan_time = atoi(optarg);
if (params.max_orphan_time < 0)
{
DLOG_ERR("bad max_orphan_time\n");
exit_clean(1);
}
break;
case 17: /* hostcase */
dp->hostcase = true;
params.tamper = true;
break;
case 18: /* 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);
params.tamper = true;
break;
case 19: /* hostdot */
dp->hostdot = true;
params.tamper = true;
break;
case 20: /* hostnospace */
dp->hostnospace = true;
params.tamper = true;
break;
case 21: /* hostpad */
dp->hostpad = atoi(optarg);
params.tamper = true;
break;
case 22: /* domcase */
dp->domcase = true;
params.tamper = true;
break;
case 23: /* split-http-req */
if (!parse_httpreqpos(optarg, &dp->split_http_req))
{
DLOG_ERR("Invalid argument for split-http-req\n");
exit_clean(1);
}
params.tamper = true;
break;
case 24: /* split-tls */
if (!parse_tlspos(optarg, &dp->split_tls))
{
DLOG_ERR("Invalid argument for split-tls\n");
exit_clean(1);
}
params.tamper = true;
break;
case 25: /* split-pos */
i = atoi(optarg);
if (i>0)
dp->split_pos = i;
else
{
DLOG_ERR("Invalid argument for split-pos\n");
exit_clean(1);
}
params.tamper = true;
break;
case 26: /* split-any-protocol */
dp->split_any_protocol = true;
break;
case 27: /* disorder */
if (optarg)
{
if (!strcmp(optarg,"http")) dp->disorder_http=true;
else if (!strcmp(optarg,"tls")) dp->disorder_tls=true;
else
{
DLOG_ERR("Invalid argument for disorder\n");
exit_clean(1);
}
}
else
dp->disorder = true;
save_default_ttl();
break;
case 28: /* oob */
if (optarg)
{
if (!strcmp(optarg,"http")) dp->oob_http=true;
else if (!strcmp(optarg,"tls")) dp->oob_tls=true;
else
{
DLOG_ERR("Invalid argument for oob\n");
exit_clean(1);
}
}
else
dp->oob = true;
break;
case 29: /* oob-data */
{
size_t l = strlen(optarg);
unsigned int bt;
if (l==1) dp->oob_byte = (uint8_t)*optarg;
else if (l!=4 || sscanf(optarg,"0x%02X",&bt)!=1)
{
DLOG_ERR("Invalid argument for oob-data\n");
exit_clean(1);
}
else dp->oob_byte = (uint8_t)bt;
}
break;
case 30: /* methodspace */
dp->methodspace = true;
params.tamper = true;
break;
case 31: /* methodeol */
dp->methodeol = true;
params.tamper = true;
break;
case 32: /* hosttab */
dp->hosttab = true;
params.tamper = true;
break;
case 33: /* unixeol */
dp->unixeol = true;
params.tamper = true;
break;
case 34: /* tlsrec */
if (!parse_tlspos(optarg, &dp->tlsrec))
{
DLOG_ERR("Invalid argument for tlsrec\n");
exit_clean(1);
}
params.tamper = true;
break;
case 35: /* tlsrec-pos */
if ((dp->tlsrec_pos = atoi(optarg))>0)
dp->tlsrec = tlspos_pos;
else
{
DLOG_ERR("Invalid argument for tlsrec-pos\n");
exit_clean(1);
}
params.tamper = true;
break;
case 36: /* hostlist */
if (!RegisterHostlist(dp, false, optarg))
{
DLOG_ERR("failed to register hostlist '%s'\n", optarg);
exit_clean(1);
}
params.tamper = true;
break;
case 37: /* hostlist-exclude */
if (!RegisterHostlist(dp, true, optarg))
{
DLOG_ERR("failed to register hostlist '%s'\n", optarg);
exit_clean(1);
}
params.tamper = true;
break;
case 38: /* 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);
}
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);
}
if (!(dp->hostlist_auto=RegisterHostlist(dp, false, optarg)))
{
DLOG_ERR("failed to register hostlist '%s'\n", optarg);
exit_clean(1);
}
params.tamper = true; // need to detect blocks and update autohostlist. cannot just slice.
break;
case 39: /* 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 40: /* 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 41: /* hostlist-auto-debug */
{
FILE *F = fopen(optarg,"a+t");
if (!F)
{
DLOG_ERR("cannot create %s\n", optarg);
exit_clean(1);
}
fclose(F);
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);
strncpy(params.hostlist_auto_debuglog, optarg, sizeof(params.hostlist_auto_debuglog));
params.hostlist_auto_debuglog[sizeof(params.hostlist_auto_debuglog) - 1] = '\0';
}
break;
case 42: /* pidfile */
strncpy(params.pidfile,optarg,sizeof(params.pidfile));
params.pidfile[sizeof(params.pidfile)-1]='\0';
break;
case 43: /* 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);
}
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);
if (!params.debug) params.debug = 1;
params.debug_target = LOG_TARGET_FILE;
}
else if (!strcmp(optarg,"syslog"))
{
if (!params.debug) params.debug = 1;
params.debug_target = LOG_TARGET_SYSLOG;
openlog("tpws",LOG_PID,LOG_USER);
}
else
{
params.debug = atoi(optarg);
params.debug_target = LOG_TARGET_CONSOLE;
}
}
else
{
params.debug = 1;
params.debug_target = LOG_TARGET_CONSOLE;
}
break;
case 44: /* debug-level */
params.debug = atoi(optarg);
break;
case 45: /* local-rcvbuf */
#ifdef __linux__
params.local_rcvbuf = atoi(optarg)/2;
#else
params.local_rcvbuf = atoi(optarg);
#endif
break;
case 46: /* local-sndbuf */
#ifdef __linux__
params.local_sndbuf = atoi(optarg)/2;
#else
params.local_sndbuf = atoi(optarg);
#endif
break;
case 47: /* remote-rcvbuf */
#ifdef __linux__
params.remote_rcvbuf = atoi(optarg)/2;
#else
params.remote_rcvbuf = atoi(optarg);
#endif
break;
case 48: /* remote-sndbuf */
#ifdef __linux__
params.remote_sndbuf = atoi(optarg)/2;
#else
params.remote_sndbuf = atoi(optarg);
#endif
break;
case 49: /* socks */
params.proxy_type = CONN_TYPE_SOCKS;
break;
case 50: /* no-resolve */
params.no_resolve = true;
break;
case 51: /* resolver-threads */
params.resolver_threads = atoi(optarg);
if (params.resolver_threads<1 || params.resolver_threads>300)
{
DLOG_ERR("resolver-threads must be within 1..300\n");
exit_clean(1);
}
break;
case 52: /* skip-nodelay */
params.skip_nodelay = true;
break;
case 53: /* tamper-start */
{
const char *p=optarg;
if (*p=='n')
{
dp->tamper_start_n=true;
p++;
}
else
dp->tamper_start_n=false;
dp->tamper_start = atoi(p);
}
params.tamper_lim = true;
break;
case 54: /* tamper-cutoff */
{
const char *p=optarg;
if (*p=='n')
{
dp->tamper_cutoff_n=true;
p++;
}
else
dp->tamper_cutoff_n=false;
dp->tamper_cutoff = atoi(p);
}
params.tamper_lim = true;
break;
case 55: /* connect-bind-addr */
{
char *p = strchr(optarg,'%');
if (p) *p++=0;
if (inet_pton(AF_INET, optarg, &params.connect_bind4.sin_addr))
{
params.connect_bind4.sin_family = AF_INET;
}
else if (inet_pton(AF_INET6, optarg, &params.connect_bind6.sin6_addr))
{
params.connect_bind6.sin6_family = AF_INET6;
if (p && *p)
{
// copy interface name for delayed resolution
strncpy(params.connect_bind6_ifname,p,sizeof(params.connect_bind6_ifname));
params.connect_bind6_ifname[sizeof(params.connect_bind6_ifname)-1]=0;
}
}
else
{
DLOG_ERR("bad bind addr : %s\n", optarg);
exit_clean(1);
}
}
break;
case 56: /* 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 57: /* 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 58: /* filter-tcp */
if (!parse_pf_list(optarg,&dp->pf_tcp))
{
DLOG_ERR("Invalid port filter : %s\n",optarg);
exit_clean(1);
}
break;
case 59: /* filter-l7 */
if (!parse_l7_list(optarg,&dp->filter_l7))
{
DLOG_ERR("Invalid l7 filter : %s\n",optarg);
exit_clean(1);
}
break;
case 60: /* ipset */
if (!RegisterIpset(dp, false, optarg))
{
DLOG_ERR("failed to register ipset '%s'\n", optarg);
exit_clean(1);
}
params.tamper = true;
break;
case 61: /* ipset-exclude */
if (!RegisterIpset(dp, true, optarg))
{
DLOG_ERR("failed to register ipset '%s'\n", optarg);
exit_clean(1);
}
params.tamper = true;
break;
#if defined(__FreeBSD__)
case 62: /* enable-pf */
params.pf_enable = true;
break;
#elif defined(__linux__) || defined(__APPLE__)
case 62: /* local-tcp-user-timeout */
params.tcp_user_timeout_local = atoi(optarg);
if (params.tcp_user_timeout_local<0 || params.tcp_user_timeout_local>86400)
{
DLOG_ERR("Invalid argument for tcp user timeout. must be 0..86400\n");
exit_clean(1);
}
break;
case 63: /* remote-tcp-user-timeout */
params.tcp_user_timeout_remote = atoi(optarg);
if (params.tcp_user_timeout_remote<0 || params.tcp_user_timeout_remote>86400)
{
DLOG_ERR("Invalid argument for tcp user timeout. must be 0..86400\n");
exit_clean(1);
}
break;
#endif
#if defined(__linux__)
case 64: /* mss */
// this option does not work in any BSD and MacOS. OS may accept but it changes nothing
dp->mss = atoi(optarg);
if (dp->mss<88 || dp->mss>32767)
{
DLOG_ERR("Invalid value for MSS. Linux accepts MSS 88-32767.\n");
exit_clean(1);
}
break;
#ifdef SPLICE_PRESENT
case 65: /* nosplice */
params.nosplice = true;
break;
#endif
#endif
}
}
if (!params.bind_wait_only && !params.port)
{
DLOG_ERR("Need port number\n");
exit_clean(1);
}
if (params.binds_last<=0)
{
params.binds_last=0; // default bind to all
}
if (!params.resolver_threads) params.resolver_threads = 5 + params.maxconn/50;
VPRINT("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;
if (dp->split_tls==tlspos_none && dp->split_pos) dp->split_tls=tlspos_pos;
if (dp->split_http_req==httpreqpos_none && dp->split_pos) dp->split_http_req=httpreqpos_pos;
if (params.skip_nodelay && (dp->split_tls || dp->split_http_req || dp->split_pos))
{
DLOG_ERR("Cannot split with --skip-nodelay\n");
exit_clean(1);
}
}
if (!LoadAllHostLists())
{
DLOG_ERR("hostlists load failed\n");
exit_clean(1);
}
if (!LoadAllIpsets())
{
DLOG_ERR("ipset load failed\n");
exit_clean(1);
}
VPRINT("\nlists summary:\n");
HostlistsDebug();
IpsetsDebug();
VPRINT("\n");
}
static bool find_listen_addr(struct sockaddr_storage *salisten, const char *bindiface, bool bind_if6, enum bindll bindll, int *if_index)
{
struct ifaddrs *addrs,*a;
bool found=false;
if (getifaddrs(&addrs)<0)
return false;
// for ipv6 preference order
// bind-linklocal-1 : link-local,any
// bind-linklocal=0 : private,global,link-local
for(int pass=0;pass<3;pass++)
{
a = addrs;
while (a)
{
if (a->ifa_addr)
{
if (a->ifa_addr->sa_family==AF_INET &&
*bindiface && !bind_if6 && !strcmp(a->ifa_name, bindiface))
{
salisten->ss_family = AF_INET;
memcpy(&((struct sockaddr_in*)salisten)->sin_addr, &((struct sockaddr_in*)a->ifa_addr)->sin_addr, sizeof(struct in_addr));
found=true;
goto ex;
}
// ipv6 links locals are fe80::/10
else if (a->ifa_addr->sa_family==AF_INET6
&&
((!*bindiface && (bindll==prefer || bindll==force)) ||
(*bindiface && bind_if6 && !strcmp(a->ifa_name, bindiface)))
&&
((bindll==force && is_linklocal((struct sockaddr_in6*)a->ifa_addr)) ||
(bindll==prefer && ((pass==0 && is_linklocal((struct sockaddr_in6*)a->ifa_addr)) || (pass==1 && is_private6((struct sockaddr_in6*)a->ifa_addr)) || pass==2)) ||
(bindll==no && ((pass==0 && is_private6((struct sockaddr_in6*)a->ifa_addr)) || (pass==1 && !is_linklocal((struct sockaddr_in6*)a->ifa_addr)))) ||
(bindll==unwanted && ((pass==0 && is_private6((struct sockaddr_in6*)a->ifa_addr)) || (pass==1 && !is_linklocal((struct sockaddr_in6*)a->ifa_addr)) || pass==2)))
)
{
salisten->ss_family = AF_INET6;
memcpy(&((struct sockaddr_in6*)salisten)->sin6_addr, &((struct sockaddr_in6*)a->ifa_addr)->sin6_addr, sizeof(struct in6_addr));
if (if_index) *if_index = if_nametoindex(a->ifa_name);
found=true;
goto ex;
}
}
a = a->ifa_next;
}
}
ex:
freeifaddrs(addrs);
return found;
}
static bool read_system_maxfiles(rlim_t *maxfile)
{
#ifdef __linux__
FILE *F;
int n;
uintmax_t um;
if (!(F=fopen("/proc/sys/fs/file-max","r")))
return false;
n=fscanf(F,"%ju",&um);
fclose(F);
if (n != 1) return false;
*maxfile = (rlim_t)um;
return true;
#elif defined(BSD)
int maxfiles,mib[2]={CTL_KERN, KERN_MAXFILES};
size_t len = sizeof(maxfiles);
if (sysctl(mib,2,&maxfiles,&len,NULL,0)==-1)
return false;
*maxfile = (rlim_t)maxfiles;
return true;
#else
return false;
#endif
}
static bool write_system_maxfiles(rlim_t maxfile)
{
#ifdef __linux__
FILE *F;
int n;
if (!(F=fopen("/proc/sys/fs/file-max","w")))
return false;
n=fprintf(F,"%ju",(uintmax_t)maxfile);
fclose(F);
return !!n;
#elif defined(BSD)
int maxfiles=(int)maxfile,mib[2]={CTL_KERN, KERN_MAXFILES};
if (sysctl(mib,2,NULL,0,&maxfiles,sizeof(maxfiles))==-1)
return false;
return true;
#else
return false;
#endif
}
static bool set_ulimit(void)
{
rlim_t fdmax,fdmin_system,cur_lim=0;
int n;
if (!params.maxfiles)
{
// 4 fds per tamper connection (2 pipe + 2 socket), 6 fds for tcp proxy connection (4 pipe + 2 socket), 2 fds (2 socket) for nosplice
// additional 1/2 for unpaired remote legs sending buffers
// 16 for listen_fd, epoll, hostlist, ...
#ifdef SPLICE_PRESENT
fdmax = (rlim_t)(params.nosplice ? 2 : (params.tamper && !params.tamper_lim ? 4 : 6)) * (rlim_t)params.maxconn;
#else
fdmax = 2 * params.maxconn;
#endif
fdmax += fdmax/2 + 16;
}
else
fdmax = params.maxfiles;
fdmin_system = fdmax + 4096;
DBGPRINT("set_ulimit : fdmax=%ju fdmin_system=%ju\n",(uintmax_t)fdmax,(uintmax_t)fdmin_system);
if (!read_system_maxfiles(&cur_lim))
return false;
DBGPRINT("set_ulimit : current system file-max=%ju\n",(uintmax_t)cur_lim);
if (cur_lim<fdmin_system)
{
DBGPRINT("set_ulimit : system fd limit is too low. trying to increase to %ju\n",(uintmax_t)fdmin_system);
if (!write_system_maxfiles(fdmin_system))
{
DLOG_ERR("could not set system-wide max file descriptors\n");
return false;
}
}
struct rlimit rlim = {fdmax,fdmax};
n=setrlimit(RLIMIT_NOFILE, &rlim);
if (n==-1) DLOG_PERROR("setrlimit");
return n!=-1;
}
struct salisten_s
{
struct sockaddr_storage salisten;
socklen_t salisten_len;
int ipv6_only;
int bind_wait_ip_left; // how much seconds left from bind_wait_ip
};
static const char *bindll_s[] = { "unwanted","no","prefer","force" };
int main(int argc, char *argv[])
{
int i, listen_fd[MAX_BINDS], yes = 1, retval = 0, if_index, exit_v=EXIT_FAILURE;
struct salisten_s list[MAX_BINDS];
char ip_port[48];
srand(time(NULL));
mask_from_preflen6_prepare();
parse_params(argc, argv);
if (params.daemon) daemonize();
if (*params.pidfile && !writepid(params.pidfile))
{
DLOG_ERR("could not write pidfile\n");
goto exiterr;
}
memset(&list, 0, sizeof(list));
for(i=0;i<=params.binds_last;i++) listen_fd[i]=-1;
for(i=0;i<=params.binds_last;i++)
{
VPRINT("Prepare bind %d : addr=%s iface=%s v6=%u link_local=%s wait_ifup=%d wait_ip=%d wait_ip_ll=%d\n",i,
params.binds[i].bindaddr,params.binds[i].bindiface,params.binds[i].bind_if6,bindll_s[params.binds[i].bindll],
params.binds[i].bind_wait_ifup,params.binds[i].bind_wait_ip,params.binds[i].bind_wait_ip_ll);
if_index=0;
if (*params.binds[i].bindiface)
{
if (params.binds[i].bind_wait_ifup > 0)
{
int sec=0;
if (!is_interface_online(params.binds[i].bindiface))
{
DLOG_CONDUP("waiting for ifup of %s for up to %d second(s)...\n",params.binds[i].bindiface,params.binds[i].bind_wait_ifup);
do
{
sleep(1);
sec++;
}
while (!is_interface_online(params.binds[i].bindiface) && sec<params.binds[i].bind_wait_ifup);
if (sec>=params.binds[i].bind_wait_ifup)
{
DLOG_CONDUP("wait timed out\n");
goto exiterr;
}
}
}
if (!(if_index = if_nametoindex(params.binds[i].bindiface)) && params.binds[i].bind_wait_ip<=0)
{
DLOG_CONDUP("bad iface %s\n",params.binds[i].bindiface);
goto exiterr;
}
}
list[i].bind_wait_ip_left = params.binds[i].bind_wait_ip;
if (*params.binds[i].bindaddr)
{
if (inet_pton(AF_INET, params.binds[i].bindaddr, &((struct sockaddr_in*)(&list[i].salisten))->sin_addr))
{
list[i].salisten.ss_family = AF_INET;
}
else if (inet_pton(AF_INET6, params.binds[i].bindaddr, &((struct sockaddr_in6*)(&list[i].salisten))->sin6_addr))
{
list[i].salisten.ss_family = AF_INET6;
list[i].ipv6_only = 1;
}
else
{
DLOG_CONDUP("bad bind addr : %s\n", params.binds[i].bindaddr);
goto exiterr;
}
}
else
{
if (*params.binds[i].bindiface || params.binds[i].bindll)
{
bool found;
enum bindll bindll_1;
int sec=0;
if (params.binds[i].bind_wait_ip > 0)
{
DLOG_CONDUP("waiting for ip on %s for up to %d second(s)...\n", *params.binds[i].bindiface ? params.binds[i].bindiface : "<any>", params.binds[i].bind_wait_ip);
if (params.binds[i].bind_wait_ip_ll>0)
{
if (params.binds[i].bindll==prefer)
DLOG_CONDUP("during the first %d second(s) accepting only link locals...\n", params.binds[i].bind_wait_ip_ll);
else if (params.binds[i].bindll==unwanted)
DLOG_CONDUP("during the first %d second(s) accepting only ipv6 globals...\n", params.binds[i].bind_wait_ip_ll);
}
}
for(;;)
{
// allow, no, prefer, force
bindll_1 = (params.binds[i].bindll==prefer && sec<params.binds[i].bind_wait_ip_ll) ? force :
(params.binds[i].bindll==unwanted && sec<params.binds[i].bind_wait_ip_ll) ? no :
params.binds[i].bindll;
if (sec && sec==params.binds[i].bind_wait_ip_ll)
{
if (params.binds[i].bindll==prefer)
DLOG_CONDUP("link local address wait timeout. now accepting globals\n");
else if (params.binds[i].bindll==unwanted)
DLOG_CONDUP("global ipv6 address wait timeout. now accepting link locals\n");
}
found = find_listen_addr(&list[i].salisten,params.binds[i].bindiface,params.binds[i].bind_if6,bindll_1,&if_index);
if (found) break;
if (sec>=params.binds[i].bind_wait_ip)
break;
sleep(1);
sec++;
}
if (!found)
{
DLOG_CONDUP("suitable ip address not found\n");
goto exiterr;
}
list[i].bind_wait_ip_left = params.binds[i].bind_wait_ip - sec;
list[i].ipv6_only=1;
}
else
{
list[i].salisten.ss_family = AF_INET6;
// leave sin6_addr zero
}
}
if (list[i].salisten.ss_family == AF_INET6)
{
list[i].salisten_len = sizeof(struct sockaddr_in6);
((struct sockaddr_in6*)(&list[i].salisten))->sin6_port = htons(params.port);
if (is_linklocal((struct sockaddr_in6*)(&list[i].salisten)))
((struct sockaddr_in6*)(&list[i].salisten))->sin6_scope_id = if_index;
}
else
{
list[i].salisten_len = sizeof(struct sockaddr_in);
((struct sockaddr_in*)(&list[i].salisten))->sin_port = htons(params.port);
}
}
if (params.bind_wait_only)
{
DLOG_CONDUP("bind wait condition satisfied\n");
exit_v = 0;
goto exiterr;
}
if (params.proxy_type==CONN_TYPE_TRANSPARENT && !redir_init())
{
DLOG_ERR("could not initialize redirector !!!\n");
goto exiterr;
}
for(i=0;i<=params.binds_last;i++)
{
if (params.debug)
{
ntop46_port((struct sockaddr *)&list[i].salisten, ip_port, sizeof(ip_port));
VPRINT("Binding %d to %s\n",i,ip_port);
}
if ((listen_fd[i] = socket(list[i].salisten.ss_family, SOCK_STREAM, 0)) == -1) {
DLOG_PERROR("socket");
goto exiterr;
}
#ifndef __OpenBSD__
// in OpenBSD always IPV6_ONLY for wildcard sockets
if ((list[i].salisten.ss_family == AF_INET6) && setsockopt(listen_fd[i], IPPROTO_IPV6, IPV6_V6ONLY, &list[i].ipv6_only, sizeof(int)) == -1)
{
DLOG_PERROR("setsockopt (IPV6_ONLY)");
goto exiterr;
}
#endif
if (setsockopt(listen_fd[i], SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1)
{
DLOG_PERROR("setsockopt (SO_REUSEADDR)");
goto exiterr;
}
//Mark that this socket can be used for transparent proxying
//This allows the socket to accept connections for non-local IPs
if (params.proxy_type==CONN_TYPE_TRANSPARENT)
{
#ifdef __linux__
if (setsockopt(listen_fd[i], SOL_IP, IP_TRANSPARENT, &yes, sizeof(yes)) == -1)
{
DLOG_PERROR("setsockopt (IP_TRANSPARENT)");
goto exiterr;
}
#elif defined(BSD) && defined(SO_BINDANY)
if (setsockopt(listen_fd[i], SOL_SOCKET, SO_BINDANY, &yes, sizeof(yes)) == -1)
{
DLOG_PERROR("setsockopt (SO_BINDANY)");
goto exiterr;
}
#endif
}
if (!set_socket_buffers(listen_fd[i], params.local_rcvbuf, params.local_sndbuf))
goto exiterr;
if (!params.local_rcvbuf)
{
// HACK : dont know why but if dont set RCVBUF explicitly RCVBUF of accept()-ed socket can be very large. may be linux bug ?
int v;
socklen_t sz=sizeof(int);
if (!getsockopt(listen_fd[i],SOL_SOCKET,SO_RCVBUF,&v,&sz))
{
v/=2;
setsockopt(listen_fd[i],SOL_SOCKET,SO_RCVBUF,&v,sizeof(int));
}
}
bool bBindBug=false;
for(;;)
{
if (bind(listen_fd[i], (struct sockaddr *)&list[i].salisten, list[i].salisten_len) == -1)
{
// in linux strange behaviour was observed
// just after ifup and address assignment there's short window when bind() can't bind to addresses got from getifaddrs()
// it does not happen to transparent sockets because they can bind to any non-existend ip
// also only ipv6 seem to be buggy this way
if (errno==EADDRNOTAVAIL && params.proxy_type!=CONN_TYPE_TRANSPARENT && list[i].bind_wait_ip_left)
{
if (!bBindBug)
{
ntop46_port((struct sockaddr *)&list[i].salisten, ip_port, sizeof(ip_port));
DLOG_CONDUP("address %s is not available. will retry for %d sec\n",ip_port,list[i].bind_wait_ip_left);
bBindBug=true;
}
sleep(1);
list[i].bind_wait_ip_left--;
continue;
}
DLOG_PERROR("bind");
goto exiterr;
}
break;
}
if (listen(listen_fd[i], BACKLOG) == -1)
{
DLOG_PERROR("listen");
goto exiterr;
}
}
set_ulimit();
sec_harden();
if (params.droproot && !droproot(params.uid,params.gid))
goto exiterr;
print_id();
//splice() causes the process to receive the SIGPIPE-signal if one part (for
//example a socket) is closed during splice(). I would rather have splice()
//fail and return -1, so blocking SIGPIPE.
if (block_sigpipe() == -1) {
DLOG_ERR("Could not block SIGPIPE signal\n");
goto exiterr;
}
DLOG_CONDUP(params.proxy_type==CONN_TYPE_SOCKS ? "socks mode\n" : "transparent proxy mode\n");
if (!params.tamper) DLOG_CONDUP("TCP proxy mode (no tampering)\n");
signal(SIGHUP, onhup);
signal(SIGUSR2, onusr2);
retval = event_loop(listen_fd,params.binds_last+1);
exit_v = retval < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
DLOG_CONDUP("Exiting\n");
exiterr:
redir_close();
for(i=0;i<=params.binds_last;i++) if (listen_fd[i]!=-1) close(listen_fd[i]);
cleanup_params();
return exit_v;
}
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