BSD 4_2 release

[unix-history] / usr / src / ucb / chsh.c

diff --git a/usr/src/ucb/chsh.c b/usr/src/ucb/chsh.c
index 88e44f5..6bc38a1 100644 (file)
--- a/usr/src/ucb/chsh.c
+++ b/usr/src/ucb/chsh.c
@@ -1,12 +1,16 @@
-static char *sccsid = "@(#)chsh.c      4.4 (Berkeley) 2/9/83";
+#ifndef lint
+static char *sccsid = "@(#)chsh.c      4.7 (Berkeley) 7/10/83";
+#endif
+

 /*
  * chsh
  */
 #include <stdio.h>
 /*
  * chsh
  */
 #include <stdio.h>

-#include <sys/types.h>
-#include <stat.h>

 #include <signal.h>
 #include <pwd.h>
 #include <signal.h>
 #include <pwd.h>

+#include <sys/file.h>
+#include <sys/time.h>
+#include <sys/resource.h>

 
 char   passwd[] = "/etc/passwd";
 char   temp[]   = "/etc/ptmp";
 
 char   passwd[] = "/etc/passwd";
 char   temp[]   = "/etc/ptmp";


@@ -15,111 +19,109 @@ struct    passwd *getpwent();
 int    endpwent();
 char   *crypt();
 char   *getpass();
 int    endpwent();
 char   *crypt();
 char   *getpass();

-char   *pw;
-char   pwbuf[10];
+char   *strcat();

 char   buf[BUFSIZ];
 
 main(argc, argv)
 char   buf[BUFSIZ];
 
 main(argc, argv)

-char *argv[];
+register char *argv[];

 {
 {

-       char *p;
-       int i;
-       char saltc[2];
-       long salt;
-       int u,fi,fo;
-       int insist;
-       int ok, flags;
-       int c;
-       int pwlen;
-       FILE *tf;
-       struct stat sbuf;
+       register int u, fd;
+       register FILE *tf;

 
 

-       insist = 0;
-       if(argc < 2 || argc > 3) {
+       if (argc < 2 || argc > 3) {

                printf("Usage: chsh user [ /bin/csh ]\n");
                printf("Usage: chsh user [ /bin/csh ]\n");

-               goto bex;
+               exit(1);

        }
        if (argc == 2)
                argv[2] = "";
        }
        if (argc == 2)
                argv[2] = "";

-       else if (strcmp(argv[2], "/bin/csh") != 0 &&
-                strcmp(argv[2], "/usr/new/csh") != 0 && getuid()) {
-               printf("Only /bin/csh or /usr/new/csh may be specified\n");
-               exit(1);
-       }
-       if (argc == 3)
-               if (stat(argv[2],&sbuf) < 0)
-               {
-                       printf("%s is unavailable\n",argv[2]);
+       else {
+               if (argv[2][0] != '/')
+                       argv[2] = strcat(
+                           "/bin/\0 12345678901234567890123456789", argv[2]);
+               if (strcmp(argv[2], "/bin/csh") &&
+                   strcmp(argv[2], "/bin/oldcsh") &&
+                   strcmp(argv[2], "/bin/newcsh") &&
+                   strcmp(argv[2], "/usr/new/csh") &&
+                       /* and, for cretins who can't read the manual */
+                   strcmp(argv[2], "/bin/sh") &&
+                   getuid()) {
+                       printf(
+                           "Only /bin/csh may be specified\n"
+                       );

                        exit(1);
                }
                        exit(1);
                }

-       while((pwd=getpwent()) != NULL){
-               if(strcmp(pwd->pw_name,argv[1]) == 0){
+               if (access(argv[2], 1) < 0) {
+                       printf("%s is not available\n", argv[2]);
+                       exit(1);
+               }
+       }
+       unlimit(RLIMIT_CPU);
+       unlimit(RLIMIT_FSIZE);
+       while ((pwd=getpwent()) != NULL) {
+               if (strcmp(pwd->pw_name, argv[1]) == 0) {

                        u = getuid();
                        u = getuid();

-                       if(u!=0 && u != pwd->pw_uid){
+                       if (u!=0 && u != pwd->pw_uid) {

                                printf("Permission denied.\n");
                                printf("Permission denied.\n");

-                               goto bex;
-                               }
-                       break;
+                               exit(1);

                        }
                        }

+                       break;

                }
                }

+       }

        endpwent();
        endpwent();

-       signal(SIGHUP, 1);
-       signal(SIGINT, 1);
-       signal(SIGQUIT, 1);
-       signal(SIGTSTP, 1);

 
 

-       if(access(temp, 0) >= 0) {
+       signal(SIGHUP, SIG_IGN);
+       signal(SIGINT, SIG_IGN);
+       signal(SIGQUIT, SIG_IGN);
+       signal(SIGTSTP, SIG_IGN);
+       (void) umask(0);
+       if ((fd = open(temp, O_CREAT|O_EXCL|O_RDWR, 0644)) < 0) {

                printf("Temporary file busy -- try again\n");
                printf("Temporary file busy -- try again\n");

-               goto bex;
+               exit(1);

        }
        }

-       if((tf=fopen(temp,"w")) == NULL) {
-               printf("Cannot create temporary file\n");
-               goto bex;
+       if ((tf=fdopen(fd, "w")) == NULL) {
+               printf("Absurd fdopen failure - seek help\n");
+               goto out;

        }
        }

-
-/*
- *     copy passwd to temp, replacing matching lines
- *     with new shell.
- */
-
-       while((pwd=getpwent()) != NULL) {
-               if(strcmp(pwd->pw_name,argv[1]) == 0) {
+       /*
+        * Copy passwd to temp, replacing matching lines
+        * with new shell.
+        */
+       while ((pwd=getpwent()) != NULL) {
+               if (strcmp(pwd->pw_name, argv[1]) == 0) {

                        u = getuid();
                        u = getuid();

-                       if(u != 0 && u != pwd->pw_uid) {
+                       if (u != 0 && u != pwd->pw_uid) {

                                printf("Permission denied.\n");
                                goto out;
                        }
                        pwd->pw_shell = argv[2];
                }
                                printf("Permission denied.\n");
                                goto out;
                        }
                        pwd->pw_shell = argv[2];
                }

-               fprintf(tf,"%s:%s:%d:%d:%s:%s:%s\n",
-                       pwd->pw_name,
-                       pwd->pw_passwd,
-                       pwd->pw_uid,
-                       pwd->pw_gid,
-                       pwd->pw_gecos,
-                       pwd->pw_dir,
-                       pwd->pw_shell);
+               if (strcmp(pwd->pw_shell, "/bin/sh") == 0)
+                       pwd->pw_shell = "";
+               fprintf(tf, "%s:%s:%d:%d:%s:%s:%s\n"
+                       , pwd->pw_name
+                       , pwd->pw_passwd
+                       , pwd->pw_uid
+                       , pwd->pw_gid
+                       , pwd->pw_gecos
+                       , pwd->pw_dir
+                       , pwd->pw_shell
+               );

        }
        endpwent();
        }
        endpwent();

-       fclose(tf);
-
-/*
- *     copy temp back to passwd file
- */
-
-       if((fi=open(temp,0)) < 0) {
-               printf("Temp file disappeared!\n");
-               goto out;
-       }
-       if((fo=creat(passwd, 0644)) < 0) {
-               printf("Cannot recreat passwd file.\n");
-               goto out;
+       if (rename(temp, passwd) < 0) {
+               fprintf(stderr, "chsh: "); perror("rename");
+  out:
+               unlink(temp);
+               exit(1);

        }
        }

-       while((u=read(fi,buf,sizeof(buf))) > 0) write(fo,buf,u);
+       fclose(tf);
+       exit(0);
+}

 
 

-out:
-       unlink(temp);
+unlimit(lim)
+{
+       struct rlimit rlim;

 
 

-bex:
-       exit(1);
+       rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
+       setrlimit(lim, &rlim);

 }
 }