Re: Auto Login at Boot?
Setup diald, then you don't have to worry about starting up ppp. It
will do it anytime you try to access the net.
Chris
Lance Hoffmeyer wrote:
>
> IN trying to find out if there was a way to automatically login during
> boot or to login to different terminals at boot I ran across this
> program. Not being a C programmer I don't really understand what is
> happening in this program. It looks as if a password can be accepted as
> an argument but in the example there is no password mentioned
>
> dboot tty userid command
>
> Can this be used to auto login under numerous terminal under different
> user id's and passwords.
> i.e.
>
> dboot tty userid password command
>
> I usually keep three terminal open. One as root, one as user under a
> command shell and one as user under an X terminal. I use root because I
> haven't found out which files I need to give user rights to in order to
> PPP.
>
> /* dboot.c - program for inittab to execute and start processes.
> Arguments are:
> tty to use for console
> program to run (most likely login)
> [any program args]
>
> example:
>
> c1:respawn:/usr/local/bin/dboot tty1 login -f sysadmin
>
> will startup user 'sysadmin' on console 1
>
> By Dave Bennet, from Linux Journal Issue 33 January 1997
>
> o Modified by Jeremy Impson, to take one more argument, a uid that will
> be changed to. It is optional, assuming that the userid doesn't
> start with
> a '/', and assuming that the command does. July 10, 1997
>
> usage is now
> /* dboot.c - program for inittab to execute and start processes.
> Arguments are:
> tty to use for console
> program to run (most likely login)
> [any program args]
>
> example:
>
> c1:respawn:/usr/local/bin/dboot tty1 login -f sysadmin
>
> will startup user 'sysadmin' on console 1
>
> By Dave Bennet, from Linux Journal Issue 33 January 1997
>
> o Modified by Jeremy Impson, to take one more argument, a uid that will
> be changed to. It is optional, assuming that the userid doesn't
> start with
> a '/', and assuming that the command does. July 10, 1997
>
> usage is now
> dboot tty userid command
> -or-
> dboot tty command
>
> Also, added syslogging facility. Jul 10, 1997
>
> */
>
> #include <stdlib.h>
> #include <string.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <fcntl.h>
> #include <errno.h>
> #include <unistd.h>
> #include <pwd.h>
> #include <syslog.h>
>
> int main(int argc, char **argv)
> {
> char cdev[50];
> char buf[50];
> int fd, whicharg;
> pid_t pid;
> struct passwd *pw_ptr;
>
> openlog("dboot", LOG_PID, LOG_USER);
>
> if ( argv[2][0] == '/') {
> whicharg = 2;
> } else {
> whicharg = 3;
> }
>
> strcpy(cdev,"/dev/");
> strcat(cdev,argv[1]); /* console device */
> if (-1 == (fd = open(cdev, O_RDWR))) {
> syslog(LOG_ERR,"open failure\n");
> /* perror("open failure"); */
> exit(0);
> }
>
> close(0);
>
> if (-1 == (dup(fd))) {
> syslog(LOG_ERR,"dup 0 failure\n");
> /* perror("dup 0 failure"); */
> exit(0);
> }
>
> close(1);
>
> if (-1 == (dup(fd))) {
> syslog(LOG_ERR,"dup 1 failure\n");
> /* perror("dup 1 failure"); */
> exit(0);
> }
>
> close(2);
>
> if (-1 == (dup(fd))) {
> syslog(LOG_ERR,"dup 2 failure\n");
> /* perror("dup 2 failure"); */
> exit(0);
> }
>
> if (3 == whicharg) {
> if (NULL == (pw_ptr = getpwnam(argv[2]))) {
> syslog(LOG_ERR,"no pwent for %s\n",argv[2]);
> /* sprintf(buf,"no pwent for %s",argv[2]);
> perror(buf); */
> exit(0);
> }
>
> if (-1 == setuid(pw_ptr->pw_uid)) {
> syslog(LOG_ERR,"setuid failure\n");
> perror("setuid failure");
> exit(0);
> }
> }
>
> closelog();
>
> if (-1 == execvp(argv[whicharg], &argv[whicharg])) {
> syslog(LOG_ERR,"execvp failure\n");
> /* perror("execvp failure"); */
> exit(0);
> }
>
> } /* end of main */
>
> --
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