BSD 4 release

[unix-history] / usr / src / cmd / newgrp.c

static char *sccsid = "@(#)newgrp.c     4.1 (Berkeley) 10/1/80";
#include <stdio.h>
#include <grp.h>
#include <pwd.h>

struct  group   *getgrnam(), *grp;
struct  passwd  *getpwuid(), *pwd;
char    *getpass(), *crypt();

main(argc,argv)
int     argc;
char    **argv;
{
       register i;
       if(argc != 2) {
               printf("usage: newgrp groupname\n");
               exit(13);
       }
       if((grp=getgrnam(argv[1])) == NULL) {
               printf("%s: no such group\n", argv[1]);
               exit(13);
       }
       if((pwd=getpwuid(getuid())) == NULL) {
               printf("You do not exist!\n");
               exit(13);
       }
       for(i=0;grp->gr_mem[i];i++) 
               if(strcmp(grp->gr_mem[i], pwd->pw_name) == 0)
                       break;
       if(grp->gr_mem[i] == 0 && strcmp(grp->gr_name,"other")) {
               printf("Sorry\n");
               exit(13);
       }

       if(grp->gr_passwd[0] != '\0' && pwd->pw_passwd[0] == '\0') {
               if(strcmp(grp->gr_passwd, crypt(getpass("Password:"),grp->gr_passwd)) != 0) {
                       printf("Sorry\n");
                       exit(13);
               }
       }
       if(setgid(grp->gr_gid) < 0) {
               perror("setgid");
               exit(13);
       }
       setuid(getuid());
       for (i=3; i<15; i++)
               close(i);
       execl((pwd->pw_shell[0]?pwd->pw_shell:"/bin/sh"), "-i", 0);
       printf("No shell!\n");
       exit(0);
}