Fancier tunslip with keepalives, address detection, route management,
route cleanup.
This commit is contained in:
bg-
parent
17431ba16c
commit
1429faa22e
1 changed files with 61 additions and 26 deletions
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@ -28,7 +28,7 @@
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*
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* This file is part of the uIP TCP/IP stack.
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*
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* $Id: tunslip.c,v 1.3 2006/09/07 17:05:21 bg- Exp $
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* $Id: tunslip.c,v 1.4 2006/09/26 15:45:09 bg- Exp $
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*
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*/
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@ -153,6 +153,8 @@ in_addr_t giaddr;
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in_addr_t netaddr;
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in_addr_t circuit_addr;
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char tundev[32] = { "tun0" };
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struct sockaddr_in dhaddr;
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int dhsock = -1;
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@ -479,7 +481,23 @@ serial_to_tun(FILE *inslip, int outfd)
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#define DEBUG_LINE_MARKER '\r'
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int ecode;
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ecode = check_ip(&uip.iphdr, inbufptr);
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if(ecode < 0) {
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if(ecode < 0 && inbufptr == 8 && strncmp(uip.inbuf, "=IPA", 4) == 0) {
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static struct in_addr ipa;
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inbufptr = 0;
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if(memcmp(&ipa, &uip.inbuf[4], sizeof(ipa)) == 0)
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break;
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memcpy(&ipa, &uip.inbuf[4], sizeof(ipa));
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#ifdef linux
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ssystem("route add -net %s netmask %s dev %s",
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inet_ntoa(ipa), "255.255.255.255", tundev);
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#else
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ssystem("route add -net %s -netmask %s -interface %s",
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inet_ntoa(ipa), "255.255.255.255", tundev);
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#endif
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break;
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} else if(ecode < 0) {
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/*
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* If sensible ASCII string, print it as debug info!
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*/
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@ -737,38 +755,46 @@ tun_alloc(char *dev)
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}
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#endif
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char tundev[32] = { "tun0" };
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const char *ipaddr;
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const char *netmask;
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void
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cleanup(int signo)
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cleanup(void)
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{
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ssystem("ifconfig %s down", tundev);
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#ifndef linux
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ssystem("sysctl net.inet.ip.forwarding=0");
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#endif
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/* ssystem("arp -d %s", ipaddr); */
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ssystem("netstat -nr"
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" | awk '{ if ($2 == \"%s\") print \"route delete -net \"$1; }'"
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" | sh",
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tundev);
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}
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void
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sigcleanup(int signo)
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{
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fprintf(stderr, "signal %d\n", signo);
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#ifdef linux
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#else
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ssystem("sysctl net.inet.ip.forwarding=0");
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/* ssystem("arp -d %s", ipaddr); */
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ssystem("ifconfig %s delete", tundev);
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#endif
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exit(0);
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exit(0); /* exit(0) will call cleanup() */
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}
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void
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ifconf(const char *tundev, const char *ipaddr, const char *netmask)
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{
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#ifdef linux
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struct in_addr netname;
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netname.s_addr = inet_addr(ipaddr) & inet_addr(netmask);
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#ifdef linux
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ssystem("ifconfig %s inet `hostname` up", tundev);
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ssystem("route add -net %s netmask %s dev %s",
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inet_ntoa(netname), netmask, tundev);
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if (strcmp(ipaddr, "0.0.0.0") != 0)
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ssystem("route add -net %s netmask %s dev %s",
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inet_ntoa(netname), netmask, tundev);
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#else
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ssystem("ifconfig %s inet `hostname` %s netmask %s up",
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tundev, ipaddr, netmask);
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ssystem("route add -net %s -netmask %s -interface %s",
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ipaddr, netmask, tundev);
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/* ssystem("arp -s %s auto pub only", ipaddr); */
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ssystem("ifconfig %s inet up", tundev);
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if (strcmp(ipaddr, "0.0.0.0") != 0)
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ssystem("route add -net %s -netmask %s -interface %s",
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inet_ntoa(netname), netmask, tundev);
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ssystem("sysctl net.inet.ip.forwarding=1");
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#endif /* !linux */
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@ -782,6 +808,8 @@ main(int argc, char **argv)
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int tunfd, slipfd, maxfd;
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int ret;
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fd_set rset, wset;
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struct timeval timeout;
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const char helo[6] = { SLIP_END, '?', 'I', 'P', 'A', SLIP_END };
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FILE *inslip;
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const char *siodev = NULL;
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const char *dhcp_server = NULL;
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@ -812,7 +840,7 @@ main(int argc, char **argv)
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case '?':
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case 'h':
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default:
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err(1, "usage: tunslip [-s siodev] [-t tundev] [-d dhcp-server] ipaddress netmask [dhcp-server]");
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err(1, "usage: tunslip [-s siodev] [-t tundev] [-D dhcp-server] ipaddress netmask [dhcp-server]");
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break;
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}
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}
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@ -820,7 +848,7 @@ main(int argc, char **argv)
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argv += (optind - 1);
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if (argc != 3 && argc != 4)
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err(1, "usage: tunslip ipaddress netmask [dhcp-server]");
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err(1, "usage: tunslip [-s siodev] [-t tundev] [-D dhcp-server] ipaddress netmask [dhcp-server]");
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ipaddr = argv[1];
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netmask = argv[2];
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circuit_addr = inet_addr(ipaddr);
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@ -916,9 +944,10 @@ main(int argc, char **argv)
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if(tunfd == -1) err(1, "main: open");
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fprintf(stderr, "opened device ``/dev/%s''\n", tundev);
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signal(SIGHUP, cleanup);
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signal(SIGTERM, cleanup);
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signal(SIGINT, cleanup);
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atexit(cleanup);
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signal(SIGHUP, sigcleanup);
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signal(SIGTERM, sigcleanup);
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signal(SIGINT, sigcleanup);
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ifconf(tundev, ipaddr, netmask);
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while(1) {
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@ -942,10 +971,16 @@ main(int argc, char **argv)
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}
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}
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ret = select(maxfd + 1, &rset, &wset, NULL, NULL);
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timeout.tv_sec = 1;
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timeout.tv_usec = 450*1000;
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ret = select(maxfd + 1, &rset, &wset, NULL, &timeout);
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if(ret == -1)
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err(1, "select");
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else if(ret > 0) {
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else if(ret == 0 && slip_empty()) {
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ret = write(slipfd, helo, sizeof(helo));
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if(ret != sizeof(helo))
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err(1, "write helo");
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} else if(ret > 0) {
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if(FD_ISSET(slipfd, &rset))
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serial_to_tun(inslip, tunfd);
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