static int xioopen_socks4_connect(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xxfd,
unsigned groups, int socks4a, int dummy2,
int dummy3) {
/* we expect the form: host:host:port */
struct single *xfd = &xxfd->stream;
struct opt *opts0 = NULL;
const char *sockdname;
char *socksport;
const char *targetname, *targetport;
int pf = PF_UNSPEC;
int ipproto = IPPROTO_TCP;
bool dofork = false;
union sockaddr_union us_sa, *us = &us_sa;
union sockaddr_union them_sa, *them = &them_sa;
socklen_t uslen = sizeof(us_sa);
socklen_t themlen = sizeof(them_sa);
bool needbind = false;
bool lowport = false;
unsigned char buff[BUFF_LEN];
struct socks4 *sockhead = (struct socks4 *)buff;
size_t buflen = sizeof(buff);
int socktype = SOCK_STREAM;
int level;
int result;
if (argc != 4) {
Error1("%s: 3 parameters required", argv[0]);
return STAT_NORETRY;
}
sockdname = argv[1];
targetname = argv[2];
targetport = argv[3];
xfd->howtoend = END_SHUTDOWN;
if (applyopts_single(xfd, opts, PH_INIT) < 0) return -1;
applyopts(-1, opts, PH_INIT);
retropt_int(opts, OPT_SO_TYPE, &socktype);
retropt_bool(opts, OPT_FORK, &dofork);
result = _xioopen_socks4_prepare(targetport, opts, &socksport, sockhead, &buflen);
if (result != STAT_OK) return result;
result =
_xioopen_ipapp_prepare(opts, &opts0, sockdname, socksport,
&pf, ipproto,
xfd->para.socket.ip.res_opts[1],
xfd->para.socket.ip.res_opts[0],
them, &themlen, us, &uslen,
&needbind, &lowport, socktype);
Notice5("opening connection to %s:%u via socks4 server %s:%s as user \"%s\"",
targetname,
ntohs(sockhead->port),
sockdname, socksport, sockhead->userid);
do { /* loop over failed connect and socks-request attempts */
#if WITH_RETRY
if (xfd->forever || xfd->retry) {
level = E_INFO;
}
else
#endif /* WITH_RETRY */
level = E_ERROR;
/* we try to resolve the target address _before_ connecting to the socks
server: this avoids unnecessary socks connects and timeouts */
result =
_xioopen_socks4_connect0(xfd, targetname, socks4a, sockhead,
(ssize_t *)&buflen, level);
switch (result) {
case STAT_OK:
break;
#if WITH_RETRY
case STAT_RETRYLATER:
case STAT_RETRYNOW:
if (xfd->forever || xfd->retry--) {
if (result == STAT_RETRYLATER) Nanosleep(&xfd->intervall, NULL);
continue;
}
#endif /* WITH_RETRY */
default:
return result;
}
/* this cannot fork because we retrieved fork option above */
result =
_xioopen_connect (xfd,
needbind?(struct sockaddr *)us:NULL, sizeof(*us),
(struct sockaddr *)them, themlen,
opts, pf, socktype, IPPROTO_TCP, lowport, level);
switch (result) {
case STAT_OK:
break;
#if WITH_RETRY
case STAT_RETRYLATER:
case STAT_RETRYNOW:
if (xfd->forever || xfd->retry--) {
if (result == STAT_RETRYLATER) Nanosleep(&xfd->intervall, NULL);
continue;
}
#endif /* WITH_RETRY */
default:
return result;
}
applyopts(xfd->fd, opts, PH_ALL);
if ((result = _xio_openlate(xfd, opts)) < 0)
return result;
result = _xioopen_socks4_connect(xfd, sockhead, buflen, level);
switch (result) {
case STAT_OK:
break;
#if WITH_RETRY
case STAT_RETRYLATER:
case STAT_RETRYNOW:
if (xfd->forever || xfd->retry--) {
if (result == STAT_RETRYLATER) Nanosleep(&xfd->intervall, NULL);
continue;
}
#endif /* WITH_RETRY */
default:
return result;
}
if (dofork) {
xiosetchilddied(); /* set SIGCHLD handler */
}
#if WITH_RETRY
if (dofork) {
pid_t pid;
int level = E_ERROR;
if (xfd->forever || xfd->retry) {
level = E_WARN; /* most users won't expect a problem here,
so Notice is too weak */
}
while ((pid = xio_fork(false, level)) < 0) {
if (xfd->forever || --xfd->retry) {
Nanosleep(&xfd->intervall, NULL);
continue;
}
return STAT_RETRYLATER;
}
if (pid == 0) { /* child process */
xfd->forever = false;
xfd->retry = 0;
break;
}
/* parent process */
Close(xfd->fd);
Nanosleep(&xfd->intervall, NULL);
dropopts(opts, PH_ALL);
opts = copyopts(opts0, GROUP_ALL);
continue;
} else
#endif /* WITH_RETRY */
{
break;
}
} while (true); /* end of complete open loop - drop out on success */
return 0;
}
/* we expect the form "host:port" */
int xioopen_ipapp_connect(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xxfd,
unsigned groups, int socktype, int ipproto,
int pf) {
struct single *xfd = &xxfd->stream;
struct opt *opts0 = NULL;
const char *hostname = argv[1], *portname = argv[2];
bool dofork = false;
union sockaddr_union us_sa, *us = &us_sa;
union sockaddr_union them_sa, *them = &them_sa;
socklen_t uslen = sizeof(us_sa);
socklen_t themlen = sizeof(them_sa);
bool needbind = false;
bool lowport = false;
int level;
int result;
if (argc != 3) {
Error2("%s: wrong number of parameters (%d instead of 2)", argv[0], argc-1);
}
xfd->howtoend = END_SHUTDOWN;
if (applyopts_single(xfd, opts, PH_INIT) < 0) return -1;
applyopts(-1, opts, PH_INIT);
retropt_bool(opts, OPT_FORK, &dofork);
if (_xioopen_ipapp_prepare(opts, &opts0, hostname, portname, &pf, ipproto,
xfd->para.socket.ip.res_opts[1],
xfd->para.socket.ip.res_opts[0],
them, &themlen, us, &uslen, &needbind, &lowport,
socktype) != STAT_OK) {
return STAT_NORETRY;
}
if (dofork) {
xiosetchilddied(); /* set SIGCHLD handler */
}
if (xioopts.logopt == 'm') {
Info("starting connect loop, switching to syslog");
diag_set('y', xioopts.syslogfac); xioopts.logopt = 'y';
} else {
Info("starting connect loop");
}
do { /* loop over retries and forks */
#if WITH_RETRY
if (xfd->forever || xfd->retry) {
level = E_INFO;
} else
#endif /* WITH_RETRY */
level = E_ERROR;
result =
_xioopen_connect(xfd,
needbind?(struct sockaddr *)us:NULL, uslen,
(struct sockaddr *)them, themlen,
opts, pf, socktype, ipproto, lowport, level);
switch (result) {
case STAT_OK: break;
#if WITH_RETRY
case STAT_RETRYLATER:
case STAT_RETRYNOW:
if (xfd->forever || xfd->retry) {
--xfd->retry;
if (result == STAT_RETRYLATER) {
Nanosleep(&xfd->intervall, NULL);
}
dropopts(opts, PH_ALL); free(opts); opts = copyopts(opts0, GROUP_ALL);
continue;
}
return STAT_NORETRY;
#endif /* WITH_RETRY */
default:
free(opts0);free(opts);
return result;
}
#if WITH_RETRY
if (dofork) {
pid_t pid;
int level = E_ERROR;
if (xfd->forever || xfd->retry) {
level = E_WARN; /* most users won't expect a problem here,
so Notice is too weak */
}
while ((pid = xio_fork(false, level)) < 0) {
if (xfd->forever || --xfd->retry) {
Nanosleep(&xfd->intervall, NULL); continue;
}
free(opts0);
return STAT_RETRYLATER;
}
if (pid == 0) { /* child process */
xfd->forever = false; xfd->retry = 0;
break;
}
/* parent process */
Close(xfd->fd);
/* with and without retry */
Nanosleep(&xfd->intervall, NULL);
dropopts(opts, PH_ALL); free(opts); opts = copyopts(opts0, GROUP_ALL);
continue; /* with next socket() bind() connect() */
} else
#endif /* WITH_RETRY */
{
break;
}
} while (true);
/* only "active" process breaks (master without fork, or child) */
if ((result = _xio_openlate(xfd, opts)) < 0) {
free(opts0);free(opts);
return result;
}
free(opts0);free(opts);
return 0;
}
static int xioopen_proxy_connect3(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xxfd,
unsigned groups, int dummy1, int dummy2,
int dummy3) {
/* we expect the form: host:host:port */
struct single *xfd = &xxfd->stream;
int rw = (xioflags & XIO_ACCMODE);
struct proxyvars struct_proxyvars = { 0 }, *proxyvars = &struct_proxyvars;
const char *proxyname;
char *proxyport = NULL;
const char *targetname, *targetport;
/* variables to be filled with address option values */
bool dofork = false;
int socktype = SOCK_STREAM;
struct opt *opts0 = NULL;
/* */
int pf = PF_UNSPEC;
union sockaddr_union us_sa, *us = &us_sa;
union sockaddr_union them_sa, *them = &them_sa;
socklen_t uslen = sizeof(us_sa);
socklen_t themlen = sizeof(them_sa);
int ipproto = IPPROTO_TCP;
bool needbind = false;
bool lowport = false;
int level;
int result;
if (xfd->rfd >= 0) {
Error("xioopen_proxy_connect(): proxyname not allowed here");
return STAT_NORETRY;
}
proxyname = argv[1];
targetname = argv[2];
targetport = argv[3];
xfd->howtoshut = XIOSHUT_DOWN;
xfd->howtoclose = XIOCLOSE_CLOSE;
if (applyopts_single(xfd, opts, PH_INIT) < 0) return -1;
applyopts(-1, opts, PH_INIT);
retropt_int(opts, OPT_SO_TYPE, &socktype);
retropt_bool(opts, OPT_FORK, &dofork);
if (dofork && !(xioflags & XIO_MAYFORK)) {
Error("fork option not allowed by application");
}
if (retropt_string(opts, OPT_PROXYPORT, &proxyport) < 0) {
if ((proxyport = strdup(PROXYPORT)) == NULL) {
errno = ENOMEM; return -1;
}
}
result = _xioopen_proxy_prepare(proxyvars, opts, targetname, targetport);
if (result != STAT_OK) return result;
result =
_xioopen_ipapp_prepare(opts, &opts0, proxyname, proxyport,
&pf, ipproto,
xfd->para.socket.ip.res_opts[1],
xfd->para.socket.ip.res_opts[0],
them, &themlen, us, &uslen,
&needbind, &lowport, socktype);
if (result != STAT_OK) return result;
Notice4("opening connection to %s:%u via proxy %s:%s",
proxyvars->targetaddr, proxyvars->targetport, proxyname, proxyport);
do { /* loop over failed connect and proxy connect attempts */
#if WITH_RETRY
if (xfd->forever || xfd->retry) {
level = E_INFO;
} else
#endif /* WITH_RETRY */
level = E_ERROR;
result =
_xioopen_connect(xfd,
needbind?(struct sockaddr *)us:NULL, sizeof(*us),
(struct sockaddr *)them, themlen,
opts, pf, socktype, IPPROTO_TCP, lowport, level);
switch (result) {
case STAT_OK: break;
#if WITH_RETRY
case STAT_RETRYLATER:
case STAT_RETRYNOW:
if (xfd->forever || xfd->retry--) {
if (result == STAT_RETRYLATER) Nanosleep(&xfd->intervall, NULL);
continue;
}
#endif /* WITH_RETRY */
default:
return result;
}
if (XIOWITHWR(rw)) xfd->wfd = xfd->rfd;
if (!XIOWITHRD(rw)) xfd->rfd = -1;
applyopts(xfd->rfd, opts, PH_ALL);
/*!*/
if ((result = _xio_openlate(xfd, opts)) < 0)
return result;
result = _xioopen_proxy_connect(xfd, proxyvars, level);
switch (result) {
case STAT_OK: break;
#if WITH_RETRY
case STAT_RETRYLATER:
case STAT_RETRYNOW:
if (xfd->forever || xfd->retry--) {
if (result == STAT_RETRYLATER) Nanosleep(&xfd->intervall, NULL);
continue;
}
#endif /* WITH_RETRY */
default:
return result;
}
if (dofork) {
xiosetchilddied(); /* set SIGCHLD handler */
}
#if WITH_RETRY
if (dofork) {
pid_t pid;
int level = E_ERROR;
if (xfd->forever || xfd->retry) {
level = E_WARN;
}
while ((pid = xio_fork(false, level)) < 0) {
if (xfd->forever || --xfd->retry) {
Nanosleep(&xfd->intervall, NULL); continue;
}
return STAT_RETRYLATER;
}
if (pid == 0) { /* child process */
xfd->forever = false; xfd->retry = 0;
break;
}
/* parent process */
Notice1("forked off child process "F_pid, pid);
Close(xfd->rfd);
Close(xfd->wfd);
Nanosleep(&xfd->intervall, NULL);
dropopts(opts, PH_ALL); opts = copyopts(opts0, GROUP_ALL);
continue;
} else
#endif /* WITH_RETRY */
{
break;
}
} while (true); /* end of complete open loop - drop out on success */
Notice2("successfully connected to %s:%u via proxy",
proxyvars->targetaddr, proxyvars->targetport);
return 0;
}