BSD 3 development

Work on file usr/src/cmd/chsh.c

Synthesized-from: 3bsd

diff --git a/usr/src/cmd/chsh.c b/usr/src/cmd/chsh.c
new file mode 100644 (file)
index 0000000..de66b48
--- /dev/null
+++ b/usr/src/cmd/chsh.c
@@ -0,0 +1,113 @@
+/*
+ * chsh
+ */
+#include <stdio.h>
+#include <signal.h>
+#include <pwd.h>
+
+char   passwd[] = "/etc/passwd";
+char   temp[]   = "/etc/ptmp";
+struct passwd *pwd;
+struct passwd *getpwent();
+int    endpwent();
+char   *crypt();
+char   *getpass();
+char   *pw;
+char   pwbuf[10];
+char   buf[BUFSIZ];
+
+main(argc, argv)
+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;
+
+       insist = 0;
+       if(argc < 2 || argc > 3) {
+               printf("Usage: chsh user [ /bin/csh ]\n");
+               goto bex;
+       }
+       if (argc == 2)
+               argv[2] = "";
+       else if (strcmp(argv[2], "/bin/csh") && getuid()) {
+               printf("Only /bin/csh may be specified\n");
+               exit(1);
+       }
+       while((pwd=getpwent()) != NULL){
+               if(strcmp(pwd->pw_name,argv[1]) == 0){
+                       u = getuid();
+                       if(u!=0 && u != pwd->pw_uid){
+                               printf("Permission denied.\n");
+                               goto bex;
+                               }
+                       break;
+                       }
+               }
+       endpwent();
+       signal(SIGHUP, 1);
+       signal(SIGINT, 1);
+       signal(SIGQUIT, 1);
+
+       if(access(temp, 0) >= 0) {
+               printf("Temporary file busy -- try again\n");
+               goto bex;
+       }
+       if((tf=fopen(temp,"w")) == NULL) {
+               printf("Cannot create temporary file\n");
+               goto bex;
+       }
+
+/*
+ *     copy passwd to temp, replacing matching lines
+ *     with new shell.
+ */
+
+       while((pwd=getpwent()) != NULL) {
+               if(strcmp(pwd->pw_name,argv[1]) == 0) {
+                       u = getuid();
+                       if(u != 0 && u != pwd->pw_uid) {
+                               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);
+       }
+       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;
+       }
+       while((u=read(fi,buf,sizeof(buf))) > 0) write(fo,buf,u);
+
+out:
+       unlink(temp);
+
+bex:
+       exit(1);
+}