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--- bounce.c.orig 2009-03-08 23:05:57.000000000 +0900
+++ bounce.c 2009-03-08 23:07:09.000000000 +0900
@@ -1,5 +1,7 @@
/* socket bouncer, by orabidoo 12 Feb '95
using code from mark@cairo.anu.edu.au's general purpose telnet server.
+ Hacked by scot@poptart.org (April 1999) to allow a local bind address
+ and syslog logging.
*/
#include <stdio.h>
@@ -20,13 +22,16 @@
#include <sys/ioctl.h>
#include <signal.h>
#include <sys/wait.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <stdlib.h>
+#include <string.h>
#define QLEN 5
#define DEFAULT_PORT 1523
char sbuf[16384], cbuf[16384];
-extern int errno;
-extern char *sys_errlist[];
+int t=0;
void sigchld() {
signal(SIGCHLD, sigchld);
@@ -42,12 +47,15 @@
struct itimerval itime;
+ if (t)
+ {
itime.it_interval.tv_sec=0;
itime.it_interval.tv_usec=0;
- itime.it_value.tv_sec=21600;
+ itime.it_value.tv_sec=t;
itime.it_value.tv_usec=0;
setitimer(ITIMER_REAL,&itime,NULL);
/* arbitrary connection time limit: 6 hours (in case the client hangs) */
+ }
chead=ctail=cbuf;
cpos=0;
@@ -134,31 +142,66 @@
}
int main(int argc,char *argv[]) {
- int srv_fd, rem_fd, len, cl_fd, on=1;
+ int srv_fd, rem_fd, len, cl_fd, on=1, b=0, d=0, q=0;
int myport=DEFAULT_PORT, remoteport;
- struct sockaddr_in rem_addr, srv_addr, cl_addr;
+ struct sockaddr_in rem_addr, srv_addr, cl_addr, src_addr;
char *myname;
- struct hostent *hp;
+ struct hostent *hp, *hpLocal;
+
+ extern char *optarg;
+ extern int optind;
+ char *hostname = NULL;
+ char *sourcename = NULL;
+ char ch;
myname=argv[0];
- if (argc==5) {
- if (strcmp(argv[1],"-p")==0) {
- if ((myport=atoi(argv[2]))==0) {
- fprintf(stderr,"Bad port number.\n");
- exit(-1);
- }
- argv+=2;
- argc-=2;
- } else {
- fprintf(stderr,"Use: %s [-p localport] machine port \n",myname);
- exit(-1);
+
+ /* Process arguments */
+
+ while( (ch = getopt(argc, argv, "p:a:b:dqt:")) != -1 ) {
+ switch(ch) {
+ case 'b': b = 1;
+ sourcename = malloc( strlen(optarg) + 1);
+ if( !sourcename ) {
+ fprintf( stderr, "Can't allocate memory!\n" );
+ exit(-1);
}
+ strcpy( sourcename, optarg );
+ break;
+ case 'a':
+ hostname = malloc( strlen(optarg) + 1);
+ if( !hostname ) {
+ fprintf( stderr, "Can't allocate memory!\n" );
+ exit(-1);
+ }
+ strcpy( hostname, optarg );
+ break;
+
+ case 'd': d = 1; break;
+ case 'q': q = 1; break;
+ case 'p':
+ if ((myport=atoi(optarg))==0) {
+ fprintf(stderr,"Bad port number.\n");
+ exit(-1);
+ }
+ break;
+ case 't':
+ if ((t=atoi(optarg)) == 0) {
+ fprintf(stderr, "Bad timer value.\n");
+ exit(-1);
+ }
+ break;
+ }
}
- if (argc!=3) {
- fprintf(stderr,"Use: %s [-p localport] machine port \n",myname);
+
+ argc -= optind;
+ argv += optind;
+
+ if (argc!=2) {
+ fprintf(stderr,"Use: %s [-a localaddr | -b localaddr] [-d] [-q] [-p localport] [-t timer] machine port \n",myname);
exit(-1);
}
- if ((remoteport=atoi(argv[2]))<=0) {
+ if ((remoteport=atoi(argv[1]))<=0) {
fprintf(stderr, "Bad remote port number.\n");
exit(-1);
}
@@ -166,11 +209,12 @@
memset((char *) &rem_addr, 0, sizeof(rem_addr));
memset((char *) &srv_addr, 0, sizeof(srv_addr));
memset((char *) &cl_addr, 0, sizeof(cl_addr));
+ memset((char *) &src_addr, 0, sizeof(src_addr));
cl_addr.sin_family=AF_INET;
cl_addr.sin_port=htons(remoteport);
- if ((hp=gethostbyname(argv[1]))==NULL) {
- cl_addr.sin_addr.s_addr=inet_addr(argv[1]);
+ if ((hp=gethostbyname(argv[0]))==NULL) {
+ cl_addr.sin_addr.s_addr=inet_addr(argv[0]);
if (cl_addr.sin_addr.s_addr==-1) {
fprintf(stderr, "Unknown host.\n");
exit(-1);
@@ -178,19 +222,43 @@
} else
cl_addr.sin_addr=*(struct in_addr *)(hp->h_addr_list[0]);
+ if( hostname ) {
+ if ((hpLocal=gethostbyname(hostname))==NULL) {
+ srv_addr.sin_addr.s_addr=inet_addr(hostname);
+ if (srv_addr.sin_addr.s_addr==-1) {
+ fprintf(stderr, "Unknown host: %s\n", hostname);
+ exit(-1);
+ }
+ } else
+ srv_addr.sin_addr=*(struct in_addr *)(hp->h_addr_list[0]);
+ }
+
+ if( sourcename ) {
+ if ((hpLocal=gethostbyname(sourcename))==NULL) {
+ src_addr.sin_addr.s_addr=inet_addr(sourcename);
+ if (src_addr.sin_addr.s_addr==-1) {
+ fprintf(stderr, "Unknown host: %s\n", sourcename);
+ exit(-1);
+ }
+ } else
+ src_addr.sin_addr=*(struct in_addr *)(hp->h_addr_list[0]);
+ }
+ src_addr.sin_family=AF_INET;
+
srv_addr.sin_family=AF_INET;
- srv_addr.sin_addr.s_addr=htonl(INADDR_ANY);
+ /* srv_addr.sin_addr.s_addr=htonl(INADDR_ANY); */
srv_addr.sin_port=htons(myport);
srv_fd=socket(PF_INET,SOCK_STREAM,0);
- if (bind(srv_fd,&srv_addr,sizeof(srv_addr))==-1) {
+ if (bind(srv_fd,(struct sockaddr *)&srv_addr,sizeof(srv_addr))==-1) {
perror("bind");
exit(-1);
}
listen(srv_fd,QLEN);
+ srv_addr.sin_port=0;
signal(SIGCHLD, sigchld);
printf("Ready to bounce connections from port %i to %s on port %i\n",
- myport, argv[1], remoteport);
+ myport, argv[0], remoteport);
close(0); close(1); close(2);
chdir("/");
#ifdef TIOCNOTTY
@@ -202,11 +270,15 @@
if (fork()) exit(0);
while (1) {
len=sizeof(rem_addr);
- rem_fd=accept(srv_fd,&rem_addr,&len);
+ rem_fd=accept(srv_fd,(struct sockaddr *)&rem_addr,&len);
if (rem_fd<0) {
if (errno==EINTR) continue;
exit(-1);
}
+ if (!q) {
+ syslog( LOG_NOTICE, "connection from %s to local port %i. Bouncing to %s, %i",
+ inet_ntoa(rem_addr.sin_addr), myport, argv[0], remoteport );
+ }
switch(fork()) {
case -1:
/* we're in the background.. no-one to complain to */
@@ -220,6 +292,17 @@
close(rem_fd);
exit(-1);
}
+ if (b) { src_addr.sin_port=0;
+ if (bind(cl_fd,(struct sockaddr *)&src_addr,sizeof(src_addr))<0) {
+ close(rem_fd);
+ exit(-1);
+ }
+ }
+ if (d) {
+ if ((hp=gethostbyname(argv[0]))!=NULL) {
+ cl_addr.sin_addr=*(struct in_addr *)(hp->h_addr_list[0]);
+ }
+ }
if (connect(cl_fd, (struct sockaddr *)&cl_addr,
sizeof(cl_addr))<0) {
close(rem_fd);
|
