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82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/*
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* This part for NCR UNIX with is from Andrew Maffei (arm@aqua.whoi.edu). It
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* assumes TLI throughout. In order to look up endpoint address information
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* we must talk to the "timod" streams module. For some reason "timod" wants
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* to sit directly on top of the device driver. Therefore we pop off all
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* streams modules except the driver, install the "timod" module so that we
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* can figure out network addresses, and then restore the original state.
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*/
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#ifndef lint
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static char sccsid[] = "@(#) ncr.c 1.1 94/12/28 17:42:34";
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#endif
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#include <sys/types.h>
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#include <stdio.h>
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#include <syslog.h>
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#include <sys/tiuser.h>
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#include <stropts.h>
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#include <sys/conf.h>
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#include "tcpd.h"
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#define MAX_MODULE_COUNT 10 /* XXX */
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/* fromhost - tear down the streams stack then rebuild it */
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void fromhost(request)
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struct request_info *request;
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{
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int i;
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int num_mod;
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struct str_list str_list;
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struct str_mlist mod_buffer[MAX_MODULE_COUNT];
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int fd = request->fd;
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str_list.sl_nmods = MAX_MODULE_COUNT;
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str_list.sl_modlist = &mod_buffer[0];
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/*
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* On systems with WIN streams support we have to be careful about what
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* is on the stream we are passed. This code POPs off all modules above
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* the pseudo driver, pushes timod, gets the host address information,
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* pops timod and then pushes all modules back on the stream.
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*
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* Some state may be lost in this process. /usr/etc/tlid seems to do special
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* things to the stream depending on the TCP port being serviced. (not a
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* very nice thing to do!). It is unclear what to do if this code breaks
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* - the stream may be left in an unknown condition.
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*/
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if ((num_mod = ioctl(fd, I_LIST, NULL)) < 0)
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tcpd_warn("fromhost: LIST failed: %m");
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if (ioctl(fd, I_LIST, &str_list) < 0)
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tcpd_warn("fromhost: LIST failed: %m");
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/*
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* POP stream modules except for the driver.
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*/
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for (i = 0; i < num_mod - 1; i++)
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if (ioctl(fd, I_POP, 0) < 0)
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tcpd_warn("fromhost: POP %s: %m", mod_buffer[i].l_name);
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/*
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* PUSH timod so that host address ioctls can be executed.
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*/
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if (ioctl(fd, I_PUSH, "timod") < 0)
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tcpd_warn("fromhost: PUSH timod: %m");
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tli_host(request);
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/*
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* POP timod, we're done with it now.
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*/
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if (ioctl(fd, I_POP, 0) < 0)
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tcpd_warn("fromhost: POP timod: %m");
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/*
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* Restore stream modules.
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*/
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for (i = num_mod - 2; i >= 0; i--)
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if (ioctl(fd, I_PUSH, mod_buffer[i].l_name) < 0)
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tcpd_warn("fromhost: PUSH %s: %m", mod_buffer[i].l_name);
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}
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