mirror of
https://github.com/bol-van/zapret.git
synced 2024-11-30 05:50:53 +03:00
930 lines
27 KiB
C
930 lines
27 KiB
C
#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 "tpws.h"
|
|
|
|
#ifdef BSD
|
|
#include <sys/sysctl.h>
|
|
#endif
|
|
|
|
#include "tpws_conn.h"
|
|
#include "hostlist.h"
|
|
#include "params.h"
|
|
#include "sec.h"
|
|
#include "redirect.h"
|
|
#include "helpers.h"
|
|
|
|
struct params_s params;
|
|
|
|
bool bHup = false;
|
|
static void onhup(int sig)
|
|
{
|
|
printf("HUP received !\n");
|
|
if (params.hostlist)
|
|
printf("Will reload hostlist on next request\n");
|
|
bHup = true;
|
|
}
|
|
// should be called in normal execution
|
|
void dohup()
|
|
{
|
|
if (bHup)
|
|
{
|
|
if (params.hostlist)
|
|
{
|
|
if (!LoadHostList(¶ms.hostlist, params.hostfile))
|
|
{
|
|
// what will we do without hostlist ?? sure, gonna die
|
|
exit(1);
|
|
}
|
|
}
|
|
bHup = false;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static int8_t block_sigpipe()
|
|
{
|
|
sigset_t sigset;
|
|
memset(&sigset, 0, sizeof(sigset));
|
|
|
|
//Get the old sigset, add SIGPIPE and update sigset
|
|
if (sigprocmask(SIG_BLOCK, NULL, &sigset) == -1) {
|
|
perror("sigprocmask (get)");
|
|
return -1;
|
|
}
|
|
|
|
if (sigaddset(&sigset, SIGPIPE) == -1) {
|
|
perror("sigaddset");
|
|
return -1;
|
|
}
|
|
|
|
if (sigprocmask(SIG_BLOCK, &sigset, NULL) == -1) {
|
|
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 void exithelp()
|
|
{
|
|
printf(
|
|
" --bind-addr=<v4_addr>|<v6_addr>; for v6 link locals append %%interface_name\n"
|
|
" --bind-iface4=<interface_name>\t; bind to the first ipv4 addr of interface\n"
|
|
" --bind-iface6=<interface_name>\t; bind to the first ipv6 addr of interface\n"
|
|
" --bind-linklocal=no|unwanted|prefer|force\n"
|
|
"\t\t\t\t; prohibit, accept, prefer or force ipv6 link local bind\n"
|
|
" --bind-wait-ifup=<sec>\t\t; wait for interface to appear and up\n"
|
|
" --bind-wait-ip=<sec>\t\t; after ifup wait for ip address to appear up to N seconds\n"
|
|
" --bind-wait-ip-linklocal=<sec>\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; 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"
|
|
" --port=<port>\t\t\t; only one port number for all binds is supported\n"
|
|
" --socks\t\t\t; implement socks4/5 proxy instead of transparent proxy\n"
|
|
" --no-resolve\t\t\t; disable socks5 remote dns ability (resolves are not async, they block all activity)\n"
|
|
" --local-rcvbuf=<bytes>\n"
|
|
" --local-sndbuf=<bytes>\n"
|
|
" --remote-rcvbuf=<bytes>\n"
|
|
" --remote-sndbuf=<bytes>\n"
|
|
" --skip-nodelay\t\t\t; do not set TCP_NODELAY option for outgoing connections (incompatible with split options)\n"
|
|
" --maxconn=<max_connections>\n"
|
|
#ifdef SPLICE_PRESENT
|
|
" --maxfiles=<max_open_files>\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; should be at least (connections*2+16)\n"
|
|
#endif
|
|
" --max-orphan-time=<sec>\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; daemonize\n"
|
|
" --pidfile=<filename>\t\t; write pid to file\n"
|
|
" --user=<username>\t\t; drop root privs\n"
|
|
" --uid=uid[:gid]\t\t; drop root privs\n"
|
|
" --debug=0|1|2\t\t\t; 0(default)=silent 1=verbose 2=debug\n"
|
|
"\nTAMPERING:\n"
|
|
" --hostlist=<filename>\t\t; only act on host in the list (one host per line, subdomains auto apply)\n"
|
|
" --split-http-req=method|host\n"
|
|
" --split-pos=<numeric_offset>\t; split at specified pos. split-http-req takes precedence for http.\n"
|
|
" --split-any-protocol\t\t; split not only http and https\n"
|
|
" --hostcase\t\t\t; change Host: => host:\n"
|
|
" --hostspell\t\t\t; exact spelling of \"Host\" header. must be 4 chars. default is \"host\"\n"
|
|
" --hostdot\t\t\t; add \".\" after Host: name\n"
|
|
" --hosttab\t\t\t; add tab after Host: name\n"
|
|
" --hostnospace\t\t\t; remove space after Host:\n"
|
|
" --hostpad=<bytes>\t\t; add dummy padding headers before Host:\n"
|
|
" --domcase\t\t\t; mix domain case : Host: TeSt.cOm\n"
|
|
" --methodspace\t\t\t; add extra space after method\n"
|
|
" --methodeol\t\t\t; add end-of-line before method\n"
|
|
" --unixeol\t\t\t; replace 0D0A to 0A\n"
|
|
);
|
|
exit(1);
|
|
}
|
|
static void cleanup_params()
|
|
{
|
|
if (params.hostlist)
|
|
{
|
|
StrPoolDestroy(¶ms.hostlist);
|
|
params.hostlist = NULL;
|
|
}
|
|
}
|
|
static void exithelp_clean()
|
|
{
|
|
cleanup_params();
|
|
exithelp();
|
|
}
|
|
static void exit_clean(int code)
|
|
{
|
|
cleanup_params();
|
|
exit(code);
|
|
}
|
|
static void nextbind_clean()
|
|
{
|
|
params.binds_last++;
|
|
if (params.binds_last>=MAX_BINDS)
|
|
{
|
|
fprintf(stderr,"maximum of %d binds are supported\n",MAX_BINDS);
|
|
exit_clean(1);
|
|
}
|
|
}
|
|
static void checkbind_clean()
|
|
{
|
|
if (params.binds_last<0)
|
|
{
|
|
fprintf(stderr,"start new bind with --bind-addr,--bind-iface*\n");
|
|
exit_clean(1);
|
|
}
|
|
}
|
|
|
|
|
|
void parse_params(int argc, char *argv[])
|
|
{
|
|
int option_index = 0;
|
|
int v, i;
|
|
|
|
memset(¶ms, 0, sizeof(params));
|
|
memcpy(params.hostspell, "host", 4); // default hostspell
|
|
params.maxconn = DEFAULT_MAX_CONN;
|
|
params.max_orphan_time = DEFAULT_MAX_ORPHAN_TIME;
|
|
params.binds_last = -1;
|
|
if (can_drop_root())
|
|
{
|
|
params.uid = params.gid = 0x7FFFFFFF; // default uid:gid
|
|
params.droproot = true;
|
|
}
|
|
|
|
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-pos",required_argument,0,0 },// optidx=24
|
|
{ "split-any-protocol",optional_argument,0,0},// optidx=25
|
|
{ "methodspace",no_argument,0,0 },// optidx=26
|
|
{ "methodeol",no_argument,0,0 },// optidx=27
|
|
{ "hosttab",no_argument,0,0 },// optidx=28
|
|
{ "unixeol",no_argument,0,0 },// optidx=29
|
|
{ "hostlist",required_argument,0,0 },// optidx=30
|
|
{ "pidfile",required_argument,0,0 },// optidx=31
|
|
{ "debug",optional_argument,0,0 },// optidx=32
|
|
{ "local-rcvbuf",required_argument,0,0 },// optidx=33
|
|
{ "local-sndbuf",required_argument,0,0 },// optidx=34
|
|
{ "remote-rcvbuf",required_argument,0,0 },// optidx=35
|
|
{ "remote-sndbuf",required_argument,0,0 },// optidx=36
|
|
{ "socks",no_argument,0,0 },// optidx=37
|
|
{ "no-resolve",no_argument,0,0 },// optidx=38
|
|
{ "skip-nodelay",no_argument,0,0 },// optidx=39
|
|
{ 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
|
|
{
|
|
fprintf(stderr, "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)
|
|
{
|
|
fprintf(stderr, "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)
|
|
{
|
|
fprintf(stderr, "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",¶ms.uid,¶ms.gid)<1)
|
|
{
|
|
fprintf(stderr, "--uid should be : uid[:gid]\n");
|
|
exit_clean(1);
|
|
}
|
|
break;
|
|
case 14: /* maxconn */
|
|
params.maxconn = atoi(optarg);
|
|
if (params.maxconn <= 0 || params.maxconn > 10000)
|
|
{
|
|
fprintf(stderr, "bad maxconn\n");
|
|
exit_clean(1);
|
|
}
|
|
break;
|
|
case 15: /* maxfiles */
|
|
params.maxfiles = atoi(optarg);
|
|
if (params.maxfiles < 0)
|
|
{
|
|
fprintf(stderr, "bad maxfiles\n");
|
|
exit_clean(1);
|
|
}
|
|
break;
|
|
case 16: /* max-orphan-time */
|
|
params.max_orphan_time = atoi(optarg);
|
|
if (params.max_orphan_time < 0)
|
|
{
|
|
fprintf(stderr, "bad max_orphan_time\n");
|
|
exit_clean(1);
|
|
}
|
|
break;
|
|
case 17: /* hostcase */
|
|
params.hostcase = true;
|
|
params.tamper = true;
|
|
break;
|
|
case 18: /* hostspell */
|
|
if (strlen(optarg) != 4)
|
|
{
|
|
fprintf(stderr, "hostspell must be exactly 4 chars long\n");
|
|
exit_clean(1);
|
|
}
|
|
params.hostcase = true;
|
|
memcpy(params.hostspell, optarg, 4);
|
|
params.tamper = true;
|
|
break;
|
|
case 19: /* hostdot */
|
|
params.hostdot = true;
|
|
params.tamper = true;
|
|
break;
|
|
case 20: /* hostnospace */
|
|
params.hostnospace = true;
|
|
params.tamper = true;
|
|
break;
|
|
case 21: /* hostpad */
|
|
params.hostpad = atoi(optarg);
|
|
params.tamper = true;
|
|
break;
|
|
case 22: /* domcase */
|
|
params.domcase = true;
|
|
params.tamper = true;
|
|
break;
|
|
case 23: /* split-http-req */
|
|
if (!strcmp(optarg, "method"))
|
|
params.split_http_req = split_method;
|
|
else if (!strcmp(optarg, "host"))
|
|
params.split_http_req = split_host;
|
|
else
|
|
{
|
|
fprintf(stderr, "Invalid argument for split-http-req\n");
|
|
exit_clean(1);
|
|
}
|
|
params.tamper = true;
|
|
break;
|
|
case 24: /* split-pos */
|
|
i = atoi(optarg);
|
|
if (i)
|
|
params.split_pos = i;
|
|
else
|
|
{
|
|
fprintf(stderr, "Invalid argument for split-pos\n");
|
|
exit_clean(1);
|
|
}
|
|
params.tamper = true;
|
|
break;
|
|
case 25: /* split-any-protocol */
|
|
params.split_any_protocol = true;
|
|
break;
|
|
case 26: /* methodspace */
|
|
params.methodspace = true;
|
|
params.tamper = true;
|
|
break;
|
|
case 27: /* methodeol */
|
|
params.methodeol = true;
|
|
params.tamper = true;
|
|
break;
|
|
case 28: /* hosttab */
|
|
params.hosttab = true;
|
|
params.tamper = true;
|
|
break;
|
|
case 29: /* unixeol */
|
|
params.unixeol = true;
|
|
params.tamper = true;
|
|
break;
|
|
case 30: /* hostlist */
|
|
if (!LoadHostList(¶ms.hostlist, optarg))
|
|
exit_clean(1);
|
|
strncpy(params.hostfile,optarg,sizeof(params.hostfile));
|
|
params.hostfile[sizeof(params.hostfile)-1]='\0';
|
|
params.tamper = true;
|
|
break;
|
|
case 31: /* pidfile */
|
|
strncpy(params.pidfile,optarg,sizeof(params.pidfile));
|
|
params.pidfile[sizeof(params.pidfile)-1]='\0';
|
|
break;
|
|
case 32:
|
|
params.debug = optarg ? atoi(optarg) : 1;
|
|
break;
|
|
case 33: /* local-rcvbuf */
|
|
params.local_rcvbuf = atoi(optarg)/2;
|
|
break;
|
|
case 34: /* local-sndbuf */
|
|
params.local_sndbuf = atoi(optarg)/2;
|
|
break;
|
|
case 35: /* remote-rcvbuf */
|
|
params.remote_rcvbuf = atoi(optarg)/2;
|
|
break;
|
|
case 36: /* remote-sndbuf */
|
|
params.remote_sndbuf = atoi(optarg)/2;
|
|
break;
|
|
case 37: /* socks */
|
|
params.proxy_type = CONN_TYPE_SOCKS;
|
|
break;
|
|
case 38: /* no-resolve */
|
|
params.no_resolve = true;
|
|
break;
|
|
case 39: /* skip-nodelay */
|
|
params.skip_nodelay = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!params.bind_wait_only && !params.port)
|
|
{
|
|
fprintf(stderr, "Need port number\n");
|
|
exit_clean(1);
|
|
}
|
|
if (params.binds_last<=0)
|
|
{
|
|
params.binds_last=0; // default bind to all
|
|
}
|
|
if (params.skip_nodelay && (params.split_http_req || params.split_pos))
|
|
{
|
|
fprintf(stderr, "Cannot split with --skip-nodelay\n");
|
|
exit_clean(1);
|
|
}
|
|
}
|
|
|
|
|
|
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;
|
|
bool bindll_want = bindll==prefer || bindll==force;
|
|
|
|
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) 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()
|
|
{
|
|
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)
|
|
// additional 1/2 for unpaired remote legs sending buffers
|
|
// 16 for listen_fd, epoll, hostlist, ...
|
|
#ifdef SPLICE_PRESENT
|
|
fdmax = (params.tamper ? 4 : 6) * 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",(uintmax_t)fdmax,(uintmax_t)fdmin_system)
|
|
|
|
if (!read_system_maxfiles(&cur_lim))
|
|
return false;
|
|
DBGPRINT("set_ulimit : current system file-max=%ju",(uintmax_t)cur_lim)
|
|
if (cur_lim<fdmin_system)
|
|
{
|
|
DBGPRINT("set_ulimit : system fd limit is too low. trying to increase to %ju",(uintmax_t)fdmin_system)
|
|
if (!write_system_maxfiles(fdmin_system))
|
|
{
|
|
fprintf(stderr,"could not set system-wide max file descriptors\n");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
struct rlimit rlim = {fdmax,fdmax};
|
|
n=setrlimit(RLIMIT_NOFILE, &rlim);
|
|
if (n==-1) 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));
|
|
parse_params(argc, argv);
|
|
|
|
if (params.daemon) daemonize();
|
|
|
|
if (*params.pidfile && !writepid(params.pidfile))
|
|
{
|
|
fprintf(stderr,"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",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))
|
|
{
|
|
printf("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)
|
|
{
|
|
printf("wait timed out\n");
|
|
goto exiterr;
|
|
}
|
|
}
|
|
}
|
|
if (!(if_index = if_nametoindex(params.binds[i].bindiface)) && params.binds[i].bind_wait_ip<=0)
|
|
{
|
|
printf("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
|
|
{
|
|
printf("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)
|
|
{
|
|
printf("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)
|
|
printf("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)
|
|
printf("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)
|
|
printf("link local address wait timeout. now accepting globals\n");
|
|
else if (params.binds[i].bindll==unwanted)
|
|
printf("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)
|
|
{
|
|
printf("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)
|
|
{
|
|
printf("bind wait condition satisfied\n");
|
|
exit_v = 0;
|
|
goto exiterr;
|
|
}
|
|
|
|
if (params.proxy_type==CONN_TYPE_TRANSPARENT && !redir_init())
|
|
{
|
|
fprintf(stderr,"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",i,ip_port);
|
|
}
|
|
|
|
if ((listen_fd[i] = socket(list[i].salisten.ss_family, SOCK_STREAM, 0)) == -1) {
|
|
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)
|
|
{
|
|
perror("setsockopt (IPV6_ONLY)");
|
|
goto exiterr;
|
|
}
|
|
#endif
|
|
|
|
if (setsockopt(listen_fd[i], SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1)
|
|
{
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
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));
|
|
printf("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;
|
|
}
|
|
perror("bind");
|
|
goto exiterr;
|
|
}
|
|
break;
|
|
}
|
|
if (listen(listen_fd[i], BACKLOG) == -1)
|
|
{
|
|
perror("listen");
|
|
goto exiterr;
|
|
}
|
|
}
|
|
|
|
set_ulimit();
|
|
|
|
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) {
|
|
fprintf(stderr, "Could not block SIGPIPE signal\n");
|
|
goto exiterr;
|
|
}
|
|
|
|
printf(params.proxy_type==CONN_TYPE_SOCKS ? "socks mode\n" : "transparent proxy mode\n");
|
|
if (!params.tamper) printf("TCP proxy mode (no tampering)\n");
|
|
|
|
signal(SIGHUP, onhup);
|
|
|
|
retval = event_loop(listen_fd,params.binds_last+1);
|
|
exit_v = retval < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
|
|
printf("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;
|
|
}
|