From f8d9d05cfb1ea783457a14d3cf7fdf4d8fa450f2 Mon Sep 17 00:00:00 2001 From: Lorry Tar Creator Date: Tue, 8 Apr 1997 00:29:19 +0000 Subject: Imported from /home/lorry/working-area/delta_tcp-wrappers/tcp_wrappers_7.6.tar.gz. --- ncr.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) create mode 100644 ncr.c (limited to 'ncr.c') diff --git a/ncr.c b/ncr.c new file mode 100644 index 0000000..b903fb8 --- /dev/null +++ b/ncr.c @@ -0,0 +1,81 @@ + /* + * This part for NCR UNIX with is from Andrew Maffei (arm@aqua.whoi.edu). It + * assumes TLI throughout. In order to look up endpoint address information + * we must talk to the "timod" streams module. For some reason "timod" wants + * to sit directly on top of the device driver. Therefore we pop off all + * streams modules except the driver, install the "timod" module so that we + * can figure out network addresses, and then restore the original state. + */ + +#ifndef lint +static char sccsid[] = "@(#) ncr.c 1.1 94/12/28 17:42:34"; +#endif + +#include +#include +#include +#include +#include +#include + +#include "tcpd.h" + +#define MAX_MODULE_COUNT 10 /* XXX */ + +/* fromhost - tear down the streams stack then rebuild it */ + +void fromhost(request) +struct request_info *request; +{ + int i; + int num_mod; + struct str_list str_list; + struct str_mlist mod_buffer[MAX_MODULE_COUNT]; + int fd = request->fd; + + str_list.sl_nmods = MAX_MODULE_COUNT; + str_list.sl_modlist = &mod_buffer[0]; + + /* + * On systems with WIN streams support we have to be careful about what + * is on the stream we are passed. This code POPs off all modules above + * the pseudo driver, pushes timod, gets the host address information, + * pops timod and then pushes all modules back on the stream. + * + * Some state may be lost in this process. /usr/etc/tlid seems to do special + * things to the stream depending on the TCP port being serviced. (not a + * very nice thing to do!). It is unclear what to do if this code breaks + * - the stream may be left in an unknown condition. + */ + if ((num_mod = ioctl(fd, I_LIST, NULL)) < 0) + tcpd_warn("fromhost: LIST failed: %m"); + if (ioctl(fd, I_LIST, &str_list) < 0) + tcpd_warn("fromhost: LIST failed: %m"); + + /* + * POP stream modules except for the driver. + */ + for (i = 0; i < num_mod - 1; i++) + if (ioctl(fd, I_POP, 0) < 0) + tcpd_warn("fromhost: POP %s: %m", mod_buffer[i].l_name); + + /* + * PUSH timod so that host address ioctls can be executed. + */ + if (ioctl(fd, I_PUSH, "timod") < 0) + tcpd_warn("fromhost: PUSH timod: %m"); + tli_host(request); + + /* + * POP timod, we're done with it now. + */ + if (ioctl(fd, I_POP, 0) < 0) + tcpd_warn("fromhost: POP timod: %m"); + + /* + * Restore stream modules. + */ + for (i = num_mod - 2; i >= 0; i--) + if (ioctl(fd, I_PUSH, mod_buffer[i].l_name) < 0) + tcpd_warn("fromhost: PUSH %s: %m", mod_buffer[i].l_name); +} -- cgit v1.2.1