3e96d793e3
which I've found to be handy when doing things like bouncing SMTP or POP connections on a machine that already has an MTA or POP daemon running... Submitted by: Scot Elliott <scot@tech.boo.com>
149 lines
4 KiB
Text
149 lines
4 KiB
Text
--- bounce.c.orig Fri Jan 14 20:47:39 2000
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+++ bounce.c Fri Jan 14 20:48:56 2000
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@@ -1,5 +1,7 @@
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/* socket bouncer, by orabidoo 12 Feb '95
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using code from mark@cairo.anu.edu.au's general purpose telnet server.
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+ Hacked by scot@poptart.org (April 1999) to allow a local bind address
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+ and syslog logging.
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*/
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#include <stdio.h>
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@@ -20,13 +22,15 @@
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#include <sys/ioctl.h>
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#include <signal.h>
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#include <sys/wait.h>
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+#include <unistd.h>
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+#include <syslog.h>
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+#include <stdlib.h>
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+#include <string.h>
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#define QLEN 5
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#define DEFAULT_PORT 1523
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char sbuf[16384], cbuf[16384];
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-extern int errno;
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-extern char *sys_errlist[];
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void sigchld() {
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signal(SIGCHLD, sigchld);
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@@ -138,27 +142,45 @@
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int myport=DEFAULT_PORT, remoteport;
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struct sockaddr_in rem_addr, srv_addr, cl_addr;
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char *myname;
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- struct hostent *hp;
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+ struct hostent *hp, *hpLocal;
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+
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+ extern char *optarg;
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+ extern int optind;
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+ char *hostname = NULL;
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+ char ch;
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myname=argv[0];
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- if (argc==5) {
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- if (strcmp(argv[1],"-p")==0) {
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- if ((myport=atoi(argv[2]))==0) {
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- fprintf(stderr,"Bad port number.\n");
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- exit(-1);
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- }
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- argv+=2;
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- argc-=2;
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- } else {
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- fprintf(stderr,"Use: %s [-p localport] machine port \n",myname);
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- exit(-1);
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+
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+ /* Process arguments */
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+
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+ while( (ch = getopt(argc, argv, "p:a:")) != -1 ) {
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+ switch(ch) {
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+ case 'a':
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+ hostname = malloc( strlen(optarg) + 1);
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+ if( !hostname ) {
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+ fprintf( stderr, "Can't allocate memory!\n" );
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+ exit(-1);
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+ }
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+ strcpy( hostname, optarg );
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+ break;
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+
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+ case 'p':
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+ if ((myport=atoi(optarg))==0) {
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+ fprintf(stderr,"Bad port number.\n");
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+ exit(-1);
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}
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+ break;
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+ }
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}
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- if (argc!=3) {
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- fprintf(stderr,"Use: %s [-p localport] machine port \n",myname);
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+
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+ argc -= optind;
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+ argv += optind;
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+
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+ if (argc!=2) {
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+ fprintf(stderr,"Use: %s [-a localaddr] [-p localport] machine port \n",myname);
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exit(-1);
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}
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- if ((remoteport=atoi(argv[2]))<=0) {
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+ if ((remoteport=atoi(argv[1]))<=0) {
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fprintf(stderr, "Bad remote port number.\n");
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exit(-1);
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}
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@@ -169,8 +191,8 @@
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cl_addr.sin_family=AF_INET;
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cl_addr.sin_port=htons(remoteport);
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- if ((hp=gethostbyname(argv[1]))==NULL) {
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- cl_addr.sin_addr.s_addr=inet_addr(argv[1]);
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+ if ((hp=gethostbyname(argv[0]))==NULL) {
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+ cl_addr.sin_addr.s_addr=inet_addr(argv[0]);
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if (cl_addr.sin_addr.s_addr==-1) {
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fprintf(stderr, "Unknown host.\n");
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exit(-1);
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@@ -178,11 +200,22 @@
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} else
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cl_addr.sin_addr=*(struct in_addr *)(hp->h_addr_list[0]);
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+ if( hostname ) {
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+ if ((hpLocal=gethostbyname(hostname))==NULL) {
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+ srv_addr.sin_addr.s_addr=inet_addr(hostname);
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+ if (srv_addr.sin_addr.s_addr==-1) {
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+ fprintf(stderr, "Unknown host: %s\n", hostname);
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+ exit(-1);
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+ }
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+ } else
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+ srv_addr.sin_addr=*(struct in_addr *)(hp->h_addr_list[0]);
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+ }
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+
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srv_addr.sin_family=AF_INET;
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- srv_addr.sin_addr.s_addr=htonl(INADDR_ANY);
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+ /* srv_addr.sin_addr.s_addr=htonl(INADDR_ANY); */
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srv_addr.sin_port=htons(myport);
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srv_fd=socket(PF_INET,SOCK_STREAM,0);
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- if (bind(srv_fd,&srv_addr,sizeof(srv_addr))==-1) {
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+ if (bind(srv_fd,(struct sockaddr *)&srv_addr,sizeof(srv_addr))==-1) {
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perror("bind");
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exit(-1);
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}
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@@ -190,7 +223,7 @@
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signal(SIGCHLD, sigchld);
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printf("Ready to bounce connections from port %i to %s on port %i\n",
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- myport, argv[1], remoteport);
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+ myport, argv[0], remoteport);
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close(0); close(1); close(2);
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chdir("/");
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#ifdef TIOCNOTTY
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@@ -202,11 +235,13 @@
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if (fork()) exit(0);
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while (1) {
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len=sizeof(rem_addr);
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- rem_fd=accept(srv_fd,&rem_addr,&len);
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+ rem_fd=accept(srv_fd,(struct sockaddr *)&rem_addr,&len);
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if (rem_fd<0) {
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if (errno==EINTR) continue;
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exit(-1);
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}
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+ syslog( LOG_NOTICE, "connection from %s to local port %i. Bouncing to %s, %i",
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+ inet_ntoa(rem_addr.sin_addr), myport, argv[0], remoteport );
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switch(fork()) {
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case -1:
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/* we're in the background.. no-one to complain to */
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