731 lines
17 KiB
C
731 lines
17 KiB
C
/*
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* sys-str.c - System-dependent procedures for setting up
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* PPP interfaces on systems which use the STREAMS ppp interface.
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/*
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* TODO:
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <syslog.h>
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#include <fcntl.h>
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#include <string.h>
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#include <time.h>
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#include <utmp.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/stream.h>
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#include <sys/stropts.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/if_arp.h>
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#include <netinet/in.h>
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#include "pppd.h"
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#include "ppp.h"
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#include <net/ppp_str.h>
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#ifndef ifr_mtu
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#define ifr_mtu ifr_metric
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#endif
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#define MAXMODULES 10 /* max number of module names to save */
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static struct modlist {
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char modname[FMNAMESZ+1];
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} str_modules[MAXMODULES];
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static int str_module_count = 0;
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static int pushed_ppp;
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extern int hungup; /* has the physical layer been disconnected? */
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extern int kdebugflag;
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#define PAI_FLAGS_B7_0 0x100
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#define PAI_FLAGS_B7_1 0x200
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#define PAI_FLAGS_PAR_EVEN 0x400
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#define PAI_FLAGS_PAR_ODD 0x800
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#define PAI_FLAGS_HIBITS 0xF00
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/*
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* ppp_available - check if this kernel supports PPP.
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*/
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int
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ppp_available()
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{
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int fd, ret;
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fd = open("/dev/tty", O_RDONLY, 0);
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if (fd < 0)
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return 1; /* can't find out - assume we have ppp */
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ret = ioctl(fd, I_FIND, "pppasync") >= 0;
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close(fd);
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return ret;
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}
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/*
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* establish_ppp - Turn the serial port into a ppp interface.
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*/
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void
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establish_ppp()
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{
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/* go through and save the name of all the modules, then pop em */
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for (;;) {
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if (ioctl(fd, I_LOOK, str_modules[str_module_count].modname) < 0 ||
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ioctl(fd, I_POP, 0) < 0)
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break;
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MAINDEBUG((LOG_DEBUG, "popped stream module : %s",
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str_modules[str_module_count].modname));
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str_module_count++;
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}
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/* now push the async/fcs module */
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if (ioctl(fd, I_PUSH, "pppasync") < 0) {
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syslog(LOG_ERR, "ioctl(I_PUSH, ppp_async): %m");
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die(1);
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}
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/* finally, push the ppp_if module that actually handles the */
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/* network interface */
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if (ioctl(fd, I_PUSH, "pppif") < 0) {
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syslog(LOG_ERR, "ioctl(I_PUSH, ppp_if): %m");
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die(1);
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}
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pushed_ppp = 1;
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if (ioctl(fd, I_SETSIG, S_INPUT) < 0) {
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syslog(LOG_ERR, "ioctl(I_SETSIG, S_INPUT): %m");
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die(1);
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}
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/* read mode, message non-discard mode */
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if (ioctl(fd, I_SRDOPT, RMSGN) < 0) {
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syslog(LOG_ERR, "ioctl(I_SRDOPT, RMSGN): %m");
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die(1);
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}
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/* Flush any waiting messages, or we'll never get SIGPOLL */
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if (ioctl(fd, I_FLUSH, FLUSHRW) < 0) {
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syslog(LOG_ERR, "ioctl(I_FLUSH, FLUSHRW): %m");
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die(1);
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}
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/*
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* Find out which interface we were given.
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* (ppp_if handles this ioctl)
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*/
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if (ioctl(fd, SIOCGETU, &ifunit) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCGETU): %m");
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die(1);
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}
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/* Set debug flags in driver */
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if (ioctl(fd, SIOCSIFDEBUG, &kdebugflag) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFDEBUG): %m");
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}
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}
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/*
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* disestablish_ppp - Restore the serial port to normal operation.
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* It attempts to reconstruct the stream with the previously popped
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* modules. This shouldn't call die() because it's called from die().
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*/
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void
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disestablish_ppp()
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{
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int flags;
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char *s;
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if (hungup) {
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/* we can't push or pop modules after the stream has hung up */
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str_module_count = 0;
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return;
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}
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if (pushed_ppp) {
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/*
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* Check whether the link seems not to be 8-bit clean.
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*/
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if (ioctl(fd, SIOCGIFDEBUG, (caddr_t) &flags) == 0) {
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s = NULL;
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switch (~flags & PAI_FLAGS_HIBITS) {
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case PAI_FLAGS_B7_0:
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s = "bit 7 set to 1";
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break;
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case PAI_FLAGS_B7_1:
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s = "bit 7 set to 0";
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break;
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case PAI_FLAGS_PAR_EVEN:
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s = "odd parity";
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break;
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case PAI_FLAGS_PAR_ODD:
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s = "even parity";
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break;
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}
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if (s != NULL) {
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syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
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syslog(LOG_WARNING, "All received characters had %s", s);
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}
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}
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}
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while (ioctl(fd, I_POP, 0) == 0) /* pop any we pushed */
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;
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pushed_ppp = 0;
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for (; str_module_count > 0; str_module_count--) {
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if (ioctl(fd, I_PUSH, str_modules[str_module_count-1].modname)) {
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syslog(LOG_WARNING, "str_restore: couldn't push module %s: %m",
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str_modules[str_module_count-1].modname);
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} else {
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MAINDEBUG((LOG_INFO, "str_restore: pushed module %s",
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str_modules[str_module_count-1].modname));
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}
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}
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}
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/*
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* output - Output PPP packet.
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*/
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void
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output(unit, p, len)
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int unit;
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u_char *p;
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int len;
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{
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struct strbuf str;
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if (unit != 0)
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MAINDEBUG((LOG_WARNING, "output: unit != 0!"));
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if (debug)
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log_packet(p, len, "sent ");
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str.len = len;
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str.buf = (caddr_t) p;
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if(putmsg(fd, NULL, &str, 0) < 0) {
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syslog(LOG_ERR, "putmsg: %m");
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die(1);
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}
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}
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/*
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* read_packet - get a PPP packet from the serial device.
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*/
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int
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read_packet(buf)
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u_char *buf;
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{
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struct strbuf str;
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int len, i;
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str.maxlen = MTU+DLLHEADERLEN;
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str.buf = (caddr_t) buf;
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i = 0;
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len = getmsg(fd, NULL, &str, &i);
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if (len < 0) {
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if (errno == EAGAIN || errno == EWOULDBLOCK) {
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return -1;
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}
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syslog(LOG_ERR, "getmsg(fd) %m");
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die(1);
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}
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if (len)
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MAINDEBUG((LOG_DEBUG, "getmsg returned 0x%x",len));
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if (str.len < 0) {
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MAINDEBUG((LOG_DEBUG, "getmsg short return length %d", str.len));
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return -1;
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}
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return str.len;
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}
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/*
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* ppp_send_config - configure the transmit characteristics of
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* the ppp interface.
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*/
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void
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ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
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int unit, mtu;
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u_long asyncmap;
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int pcomp, accomp;
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{
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char c;
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struct ifreq ifr;
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strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
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ifr.ifr_mtu = mtu;
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if (ioctl(s, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
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quit();
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}
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if(ioctl(fd, SIOCSIFASYNCMAP, (caddr_t) &asyncmap) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFASYNCMAP): %m");
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quit();
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}
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c = (pcomp? 1: 0);
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if(ioctl(fd, SIOCSIFCOMPPROT, &c) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFCOMPPROT): %m");
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quit();
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}
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c = (accomp? 1: 0);
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if(ioctl(fd, SIOCSIFCOMPAC, &c) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFCOMPAC): %m");
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quit();
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}
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}
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/*
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* ppp_set_xaccm - set the extended transmit ACCM for the interface.
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*/
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void
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ppp_set_xaccm(unit, accm)
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int unit;
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ext_accm accm;
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{
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if (ioctl(fd, SIOCSIFXASYNCMAP, accm) < 0 && errno != ENOTTY)
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syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
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}
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/*
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* ppp_recv_config - configure the receive-side characteristics of
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* the ppp interface.
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*/
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void
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ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
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int unit, mru;
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u_long asyncmap;
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int pcomp, accomp;
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{
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char c;
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if (ioctl(fd, SIOCSIFMRU, &mru) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFMRU): %m");
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}
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if (ioctl(fd, SIOCSIFRASYNCMAP, (caddr_t) &asyncmap) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFRASYNCMAP): %m");
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}
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c = 2 + (pcomp? 1: 0);
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if(ioctl(fd, SIOCSIFCOMPPROT, &c) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFCOMPPROT): %m");
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}
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c = 2 + (accomp? 1: 0);
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if (ioctl(fd, SIOCSIFCOMPAC, &c) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFCOMPAC): %m");
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}
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}
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/*
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* sifvjcomp - config tcp header compression
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*/
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int
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sifvjcomp(u, vjcomp, cidcomp, maxcid)
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int u, vjcomp, cidcomp, maxcid;
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{
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char x;
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x = (vjcomp? 1: 0) + (cidcomp? 0: 2) + (maxcid << 4);
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if (ioctl(fd, SIOCSIFVJCOMP, (caddr_t) &x) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFVJCOMP): %m");
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return 0;
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}
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return 1;
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}
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/*
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* sifup - Config the interface up.
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*/
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int
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sifup(u)
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int u;
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{
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struct ifreq ifr;
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strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
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if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
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syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
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return 0;
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}
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ifr.ifr_flags |= IFF_UP;
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if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
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return 0;
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}
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return 1;
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}
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/*
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* sifdown - Config the interface down.
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*/
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int
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sifdown(u)
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int u;
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{
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struct ifreq ifr;
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strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
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if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
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syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
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return 0;
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}
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ifr.ifr_flags &= ~IFF_UP;
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if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
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return 0;
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}
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return 1;
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}
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/*
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* SET_SA_FAMILY - initialize a struct sockaddr, setting the sa_family field.
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*/
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#define SET_SA_FAMILY(addr, family) \
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BZERO((char *) &(addr), sizeof(addr)); \
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addr.sa_family = (family);
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/*
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* sifaddr - Config the interface IP addresses and netmask.
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*/
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int
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sifaddr(u, o, h, m)
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int u;
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u_long o, h, m;
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{
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int ret;
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struct ifreq ifr;
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ret = 1;
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strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
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SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
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((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = o;
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if (ioctl(s, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFADDR): %m");
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ret = 0;
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}
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((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = h;
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if (ioctl(s, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFDSTADDR): %m");
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ret = 0;
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}
|
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if (m != 0) {
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((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = m;
|
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syslog(LOG_INFO, "Setting interface mask to %s\n", ip_ntoa(m));
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if (ioctl(s, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFNETMASK): %m");
|
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ret = 0;
|
|
}
|
|
}
|
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return ret;
|
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}
|
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|
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/*
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* cifaddr - Clear the interface IP addresses, and delete routes
|
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* through the interface if possible.
|
|
*/
|
|
int
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cifaddr(u, o, h)
|
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int u;
|
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u_long o, h;
|
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{
|
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struct rtentry rt;
|
|
|
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SET_SA_FAMILY(rt.rt_dst, AF_INET);
|
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((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = h;
|
|
SET_SA_FAMILY(rt.rt_gateway, AF_INET);
|
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((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = o;
|
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rt.rt_flags = RTF_HOST;
|
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if (ioctl(s, SIOCDELRT, (caddr_t) &rt) < 0) {
|
|
syslog(LOG_ERR, "ioctl(SIOCDELRT): %m");
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* sifdefaultroute - assign a default route through the address given.
|
|
*/
|
|
int
|
|
sifdefaultroute(u, g)
|
|
int u;
|
|
u_long g;
|
|
{
|
|
struct rtentry rt;
|
|
|
|
SET_SA_FAMILY(rt.rt_dst, AF_INET);
|
|
SET_SA_FAMILY(rt.rt_gateway, AF_INET);
|
|
((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g;
|
|
rt.rt_flags = RTF_GATEWAY;
|
|
if (ioctl(s, SIOCADDRT, &rt) < 0) {
|
|
syslog(LOG_ERR, "default route ioctl(SIOCADDRT): %m");
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* cifdefaultroute - delete a default route through the address given.
|
|
*/
|
|
int
|
|
cifdefaultroute(u, g)
|
|
int u;
|
|
u_long g;
|
|
{
|
|
struct rtentry rt;
|
|
|
|
SET_SA_FAMILY(rt.rt_dst, AF_INET);
|
|
SET_SA_FAMILY(rt.rt_gateway, AF_INET);
|
|
((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g;
|
|
rt.rt_flags = RTF_GATEWAY;
|
|
if (ioctl(s, SIOCDELRT, &rt) < 0) {
|
|
syslog(LOG_ERR, "default route ioctl(SIOCDELRT): %m");
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* sifproxyarp - Make a proxy ARP entry for the peer.
|
|
*/
|
|
int
|
|
sifproxyarp(unit, hisaddr)
|
|
int unit;
|
|
u_long hisaddr;
|
|
{
|
|
struct arpreq arpreq;
|
|
|
|
BZERO(&arpreq, sizeof(arpreq));
|
|
|
|
/*
|
|
* Get the hardware address of an interface on the same subnet
|
|
* as our local address.
|
|
*/
|
|
if (!get_ether_addr(hisaddr, &arpreq.arp_ha)) {
|
|
syslog(LOG_WARNING, "Cannot determine ethernet address for proxy ARP");
|
|
return 0;
|
|
}
|
|
|
|
SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
|
|
((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
|
|
arpreq.arp_flags = ATF_PERM | ATF_PUBL;
|
|
if (ioctl(s, SIOCSARP, (caddr_t)&arpreq) < 0) {
|
|
syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* cifproxyarp - Delete the proxy ARP entry for the peer.
|
|
*/
|
|
int
|
|
cifproxyarp(unit, hisaddr)
|
|
int unit;
|
|
u_long hisaddr;
|
|
{
|
|
struct arpreq arpreq;
|
|
|
|
BZERO(&arpreq, sizeof(arpreq));
|
|
SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
|
|
((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
|
|
if (ioctl(s, SIOCDARP, (caddr_t)&arpreq) < 0) {
|
|
syslog(LOG_ERR, "ioctl(SIOCDARP): %m");
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* get_ether_addr - get the hardware address of an interface on the
|
|
* the same subnet as ipaddr. Code borrowed from myetheraddr.c
|
|
* in the cslip-2.6 distribution, which is subject to the following
|
|
* copyright notice (which also applies to logwtmp below):
|
|
*
|
|
* Copyright (c) 1990, 1992 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that: (1) source code distributions
|
|
* retain the above copyright notice and this paragraph in its entirety, (2)
|
|
* distributions including binary code include the above copyright notice and
|
|
* this paragraph in its entirety in the documentation or other materials
|
|
* provided with the distribution, and (3) all advertising materials mentioning
|
|
* features or use of this software display the following acknowledgement:
|
|
* ``This product includes software developed by the University of California,
|
|
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
|
|
* the University nor the names of its contributors may be used to endorse
|
|
* or promote products derived from this software without specific prior
|
|
* written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*/
|
|
|
|
#include <fcntl.h>
|
|
#include <nlist.h>
|
|
#include <kvm.h>
|
|
#include <arpa/inet.h>
|
|
|
|
/* XXX SunOS 4.1 defines this and 3.5 doesn't... */
|
|
#ifdef _nlist_h
|
|
#define SUNOS4
|
|
#endif
|
|
|
|
#ifdef SUNOS4
|
|
#include <netinet/in_var.h>
|
|
#endif
|
|
#include <netinet/if_ether.h>
|
|
|
|
/* Cast a struct sockaddr to a structaddr_in */
|
|
#define SATOSIN(sa) ((struct sockaddr_in *)(sa))
|
|
|
|
/* Determine if "bits" is set in "flag" */
|
|
#define ALLSET(flag, bits) (((flag) & (bits)) == (bits))
|
|
|
|
static struct nlist nl[] = {
|
|
#define N_IFNET 0
|
|
{ "_ifnet" },
|
|
{ 0 }
|
|
};
|
|
|
|
static void kread();
|
|
|
|
int
|
|
get_ether_addr(ipaddr, hwaddr)
|
|
u_long ipaddr;
|
|
struct sockaddr *hwaddr;
|
|
{
|
|
register kvm_t *kd;
|
|
register struct ifnet *ifp;
|
|
register struct arpcom *ac;
|
|
struct arpcom arpcom;
|
|
struct in_addr *inp;
|
|
#ifdef SUNOS4
|
|
register struct ifaddr *ifa;
|
|
register struct in_ifaddr *in;
|
|
union {
|
|
struct ifaddr ifa;
|
|
struct in_ifaddr in;
|
|
} ifaddr;
|
|
#endif
|
|
u_long addr, mask;
|
|
|
|
/* Open kernel memory for reading */
|
|
kd = kvm_open(0, 0, 0, O_RDONLY, NULL);
|
|
if (kd == 0) {
|
|
syslog(LOG_ERR, "kvm_open: %m");
|
|
return 0;
|
|
}
|
|
|
|
/* Fetch namelist */
|
|
if (kvm_nlist(kd, nl) != 0) {
|
|
syslog(LOG_ERR, "kvm_nlist failed");
|
|
return 0;
|
|
}
|
|
|
|
ac = &arpcom;
|
|
ifp = &arpcom.ac_if;
|
|
#ifdef SUNOS4
|
|
ifa = &ifaddr.ifa;
|
|
in = &ifaddr.in;
|
|
#endif
|
|
|
|
if (kvm_read(kd, nl[N_IFNET].n_value, (char *)&addr, sizeof(addr))
|
|
!= sizeof(addr)) {
|
|
syslog(LOG_ERR, "error reading ifnet addr");
|
|
return 0;
|
|
}
|
|
for ( ; addr; addr = (u_long)ifp->if_next) {
|
|
if (kvm_read(kd, addr, (char *)ac, sizeof(*ac)) != sizeof(*ac)) {
|
|
syslog(LOG_ERR, "error reading ifnet");
|
|
return 0;
|
|
}
|
|
|
|
/* Only look at configured, broadcast interfaces */
|
|
if (!ALLSET(ifp->if_flags, IFF_UP | IFF_BROADCAST))
|
|
continue;
|
|
#ifdef SUNOS4
|
|
/* This probably can't happen... */
|
|
if (ifp->if_addrlist == 0)
|
|
continue;
|
|
#endif
|
|
|
|
/* Get interface ip address */
|
|
#ifdef SUNOS4
|
|
if (kvm_read(kd, (u_long)ifp->if_addrlist, (char *)&ifaddr,
|
|
sizeof(ifaddr)) != sizeof(ifaddr)) {
|
|
syslog(LOG_ERR, "error reading ifaddr");
|
|
return 0;
|
|
}
|
|
inp = &SATOSIN(&ifa->ifa_addr)->sin_addr;
|
|
#else
|
|
inp = &SATOSIN(&ifp->if_addr)->sin_addr;
|
|
#endif
|
|
|
|
/* Check if this interface on the right subnet */
|
|
#ifdef SUNOS4
|
|
mask = in->ia_subnetmask;
|
|
#else
|
|
mask = ifp->if_subnetmask;
|
|
#endif
|
|
if ((ipaddr & mask) != (inp->s_addr & mask))
|
|
continue;
|
|
|
|
/* Copy out the local ethernet address */
|
|
hwaddr->sa_family = AF_UNSPEC;
|
|
BCOPY((caddr_t) &arpcom.ac_enaddr, hwaddr->sa_data,
|
|
sizeof(arpcom.ac_enaddr));
|
|
return 1; /* success! */
|
|
}
|
|
|
|
/* couldn't find one */
|
|
return 0;
|
|
}
|
|
|
|
#define WTMPFILE "/usr/adm/wtmp"
|
|
|
|
int
|
|
logwtmp(line, name, host)
|
|
char *line, *name, *host;
|
|
{
|
|
int fd;
|
|
struct stat buf;
|
|
struct utmp ut;
|
|
|
|
if ((fd = open(WTMPFILE, O_WRONLY|O_APPEND, 0)) < 0)
|
|
return;
|
|
if (!fstat(fd, &buf)) {
|
|
(void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
|
|
(void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
|
|
(void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
|
|
(void)time(&ut.ut_time);
|
|
if (write(fd, (char *)&ut, sizeof(struct utmp)) != sizeof(struct utmp))
|
|
(void)ftruncate(fd, buf.st_size);
|
|
}
|
|
close(fd);
|
|
}
|