Patch from Shaun Jackman to save a few bytes.

[oweals/busybox.git] / coreutils / id.c

diff --git a/coreutils/id.c b/coreutils/id.c
index c7f61532d00a0d015362a7b76c8bdeda37a7dca7..6360491688e46d7d90a84d5b511ff1c7cc55ed1d 100644 (file)
--- a/coreutils/id.c
+++ b/coreutils/id.c
@@ -20,77 +20,121 @@
  *
  */
 
+/* BB_AUDIT SUSv3 _NOT_ compliant -- option -G is not currently supported. */
+/* Hacked by Tito Ragusa (C) 2004 to handle usernames of whatever length and to
+ * be more similar to GNU id. 
+ */
+
 #include "busybox.h"
+#include "pwd_.h"
 #include <stdio.h>
 #include <unistd.h>
-#include <getopt.h>
-#include <string.h>
 #include <sys/types.h>
 
+#ifdef CONFIG_SELINUX
+#include <selinux/selinux.h>          /* for is_selinux_enabled() */
+#endif
+
+#define PRINT_REAL        1
+#define NAME_NOT_NUMBER   2
+#define JUST_USER         4
+#define JUST_GROUP        8
+
+static short printf_full(unsigned int id, const char *arg, const char prefix)
+{      
+       const char *fmt = "%cid=%u";
+       short status=EXIT_FAILURE;
+       
+       if(arg) {
+               fmt = "%cid=%u(%s)";
+               status=EXIT_SUCCESS;
+       }
+       bb_printf(fmt, prefix, id, arg);
+       return status;
+}
+
 extern int id_main(int argc, char **argv)
 {
-       int no_user = 0, no_group = 0, print_real = 0;
-       int name_not_number = 0;
-       char user[9], group[9];
-       long gid;
-       long pwnam, grnam;
-       int opt;
-       
-       gid = 0;
+       struct passwd *p;
+       uid_t uid;
+       gid_t gid;
+       unsigned long flags;
+       short status;
 
-       while ((opt = getopt(argc, argv, "ugrn")) > 0) {
-               switch (opt) {
-                       case 'u':
-                               no_group++;
-                               break;
-                       case 'g':
-                               no_user++;
-                               break;
-                       case 'r':
-                               print_real++;
-                               break;
-                       case 'n':
-                               name_not_number++;
-                               break;
-                       default:
-                               show_usage();
-               }
-       }
+       bb_opt_complementaly = "u~g:g~u";
+       flags = bb_getopt_ulflags(argc, argv, "rnug");
 
-       if (no_user && no_group) show_usage();
+       if ((flags & BB_GETOPT_ERROR)
+       /* Don't allow -n -r -nr */
+       || (flags <= 3 && flags > 0) 
+       /* Don't allow more than one username */
+       || (argc > optind + 1))
+               bb_show_usage();
+       
+       /* This values could be overwritten later */
+       uid = geteuid();
+       gid = getegid();
+       if (flags & PRINT_REAL) {
+               uid = getuid();
+               gid = getgid();
+       }
+       
+       if(argv[optind]) {
+               p=getpwnam(argv[optind]);
+               /* my_getpwnam is needed because it exits on failure */
+               uid = my_getpwnam(argv[optind]);
+               gid = p->pw_gid;
+               /* in this case PRINT_REAL is the same */ 
+       }
 
-       if (argv[optind] == NULL) {
-               if (print_real) {
-                       my_getpwuid(user, getuid());
-                       my_getgrgid(group, getgid());
+       if(flags & (JUST_GROUP | JUST_USER)) {
+               /* JUST_GROUP and JUST_USER are mutually exclusive */
+               if(flags & NAME_NOT_NUMBER) {
+                       /* my_getpwuid and my_getgrgid exit on failure so puts cannot segfault */
+                       puts((flags & JUST_USER) ? my_getpwuid(NULL, uid, -1 ) : my_getgrgid(NULL, gid, -1 ));
                } else {
-                       my_getpwuid(user, geteuid());
-                       my_getgrgid(group, getegid());
+                       bb_printf("%u\n",(flags & JUST_USER) ? uid : gid);
                }
-       } else {
-               safe_strncpy(user, argv[optind], sizeof(user));
-           gid = my_getpwnamegid(user);
-               my_getgrgid(group, gid);
+               /* exit */ 
+               bb_fflush_stdout_and_exit(EXIT_SUCCESS);
        }
 
-       pwnam=my_getpwnam(user);
-       grnam=my_getgrnam(group);
+       /* Print full info like GNU id */
+       /* my_getpwuid doesn't exit on failure here */
+       status=printf_full(uid, my_getpwuid(NULL, uid, 0), 'u');
+       putchar(' ');
+       /* my_getgrgid doesn't exit on failure here */
+       status|=printf_full(gid, my_getgrgid(NULL, gid, 0), 'g');
 
-       if (no_group) {
-               if(name_not_number)
-                       puts(user);
-               else
-                       printf("%ld\n", pwnam);
-       } else if (no_user) {
-               if(name_not_number)
-                       puts(group);
-               else
-                       printf("%ld\n", grnam);
-       } else {
-               printf("uid=%ld(%s) gid=%ld(%s)\n", pwnam, user, grnam, group);
+#ifdef CONFIG_SELINUX
+       if ( is_selinux_enabled() ) {
+                       security_context_t mysid;
+                       char context[80];
+                       int len = sizeof(context);
+
+                       getcon(&mysid);
+                       context[0] = '\0';
+                       if (mysid) {
+                                       len = strlen(mysid)+1;
+                                       safe_strncpy(context, mysid, len);
+                                       freecon(mysid);
+                       }else{
+                                       safe_strncpy(context, "unknown",8);
+                       }
+               bb_printf(" context=%s", context);
        }
-       return(0);
-}
+#endif
 
+       putchar('\n');
+       bb_fflush_stdout_and_exit(status);
+}
 
 /* END CODE */
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/
+