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/* Rbind.c */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#if defined(ISC)
#include <net/errno.h>
#endif /* #if defined(ISC) */
#include <stdio.h>
#include <netdb.h>
#include <sys/time.h>
#include <syslog.h>
#if (defined(sun) && !defined(SOLARIS)) || defined(sgi)
#include <strings.h>
#else
#include <string.h>
#endif
#include "socks.h"
extern int socksC_proto();
extern int socks_check_result();
extern int socks_connect_sockd();
extern int SOCKSinit();
extern int socks_ckcf();
extern struct sockshost_s socks_srcsh, socks_dstsh;
#define socks_cmd socks_dstsh.user
#define dst_name socks_dstsh.dmname[0]
#define dst_serv socks_dstsh.portname
#define src_user socks_srcsh.user
#define real_user socks_srcsh.ruser
#define src_name socks_srcsh.dmname[0]
extern int socks_init_done;
extern u_int32 socks_last_conn_host;
extern unsigned short socks_last_conn_port;
extern struct sockaddr_in socks_nsin;
extern struct sockaddr_in socks_cursin;
extern int socks_no_conf;
extern struct config *scfAddr;
extern int Nscf;
extern int socks_useSyslog;
extern char *socks_server;
static int socks_direct;
Rbind(sock, sin, size)
int sock;
struct sockaddr_in *sin;
int size;
{
Socks_t dst;
struct sockaddr_in psin;
int i;
int con_ret;
struct timeval tmo;
fd_set fds;
int s;
if (socks_init_done == 0)
SOCKSinit("SOCKSclient");
bzero((char *)&psin, sizeof(psin));
strcpy(socks_cmd, "bind");
psin.sin_addr.s_addr = socks_last_conn_host;
psin.sin_port = socks_last_conn_port;
if (socks_no_conf)
socks_direct = SOCKS_DIRECT;
else
socks_direct = socks_ckcf(&socks_srcsh, &socks_dstsh, scfAddr, Nscf, socks_useSyslog);
if (socks_direct == SOCKS_DENY) {
syslog(LOG_LOW, "Refused -- bind() from %s(%s) for %s (%s)",
src_user, real_user, dst_name, dst_serv);
errno = ECONNREFUSED;
return -1;
}
if (socks_direct == SOCKS_DIRECT) {
syslog(LOG_LOW, "bind() directly from %s(%s) for %s (%s)",
src_user, real_user, dst_name, dst_serv);
return (bind(sock, (struct sockaddr *)sin, size));
}
con_ret = socks_connect_sockd(sock);
if (con_ret == 0) {
;
#ifdef SVR4
} else if ((errno == EINPROGRESS) || (errno == EAGAIN)) {
#else
} else if (errno == EINPROGRESS) {
#endif
while (1) {
tmo.tv_sec = 0;
tmo.tv_usec = 100000;
FD_ZERO(&fds);
FD_SET(sock, &fds);
s = select(sock+1, NULL, &fds, NULL, &tmo);
if ((s == 0) || ((s == -1) && (errno == EINTR)))
continue;
if (s < 0) {
syslog(LOG_LOW, "select() in Rbind(): %m");
errno = ECONNREFUSED;
return -1;
}
con_ret = connect(sock, (struct sockaddr *)&socks_nsin, sizeof(struct sockaddr_in));
if ((con_ret < 0) && (errno == EISCONN)) {
con_ret = 0;
break;
#if defined(SVR4)
} else if ((con_ret < 0) && ((errno == EALREADY) ||
(errno == EAGAIN))) {
#else /* !defined(SVR4) */
} else if ((con_ret < 0) && (errno == EALREADY)) {
#endif /* #if defined(SVR4) */
continue;
} else
break;
}
}
if (con_ret < 0) {
syslog(LOG_LOW, "Failed -- bind() from %s(%s) for %s (%s)",
src_user, real_user, dst_name, dst_serv);
errno = ECONNREFUSED;
return -1;
}
syslog(LOG_LOW, "bind() from %s(%s) for %s (%s) using sockd at %s",
src_user, real_user, dst_name, dst_serv, socks_server);
dst.version = SOCKS_VERSION;
dst.cmd = SOCKS_BIND;
dst.port = socks_last_conn_port;
dst.host = socks_last_conn_host;
if (socksC_proto(sock, &dst) < 0)
return(-1);
socks_cursin.sin_family = AF_INET;
socks_cursin.sin_port = dst.port;
if (ntohl(dst.host) == INADDR_ANY)
socks_cursin.sin_addr.s_addr = socks_nsin.sin_addr.s_addr;
else
socks_cursin.sin_addr.s_addr = dst.host;
return (socks_check_result(dst.cmd));
}
/*
** Stub routine since the listen will have alread succeded on the
** server.
*/
Rlisten(s, n)
int s, n;
{
if (socks_direct)
return (listen(s, n));
return 0;
}
/*
** Well we know where we got a connection from.
*/
Rgetsockname(sock, sin, size)
int sock;
struct sockaddr_in *sin;
int *size;
{
if (socks_direct)
return (getsockname(sock, (struct sockaddr *)sin, size));
*size = sizeof(struct sockaddr_in);
*sin = socks_cursin;
return 0;
}
/*
** Do an accept, which is really a select for some data on
** the present socket.
*/
Raccept(sock, sin, size)
int sock;
struct sockaddr_in *sin;
int *size;
{
fd_set fds;
Socks_t dst;
int fdsbits = sock + 1;
if (socks_direct)
return(accept(sock, (struct sockaddr *)sin, size));
FD_ZERO(&fds);
FD_SET(sock, &fds);
if (select(fdsbits, &fds, NULL, NULL, NULL) > 0) {
if (FD_ISSET(sock, &fds) && (socks_GetDst(sock, &dst) >= 0)) {
sin->sin_family = AF_INET;
sin->sin_port = dst.port;
sin->sin_addr.s_addr = dst.host;
return(dup(sock));
}
}
if (socks_useSyslog)
syslog(LOG_LOW, "Connection refused by SOCKS server %s\n", socks_server);
else
fprintf(stderr, "Connection refused by SOCKS server %s\n", socks_server);
return -1;
}
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