Tito writes:

Hi Erik,
Hi to all,
This is part five of the my_get*id story.
I've tweaked a bit this two functions to make them more flexible,
but this changes will not affect existing code.
Now they work so:
1) my_getpwuid( char *user, uid_t uid, int bufsize)

   if bufsize is > 0 char *user cannot be set to NULL
                     on success username is written on static allocated buffer
                     on failure uid as string is written to buffer and NULL is returned
   if bufsize is = 0 char *user can be set to NULL
                     on success username is returned
                     on failure NULL is returned
   if bufsize is < 0 char *user can be set to NULL
                     on success username is returned
                     on failure an error message is printed and the program exits

  2) 1) my_getgrgid( char *group, uid_t uid, int bufsize)

   if bufsize is > 0 char *group cannot be set to NULL
                     on success groupname is written on static allocated buffer
                     on failure gid as string is written to buffer and NULL is returned
   if bufsize is = 0 char *group can be set to NULL
                     on success groupname is returned
                     on failure NULL is returned
   if bufsize is < 0 char *group can be set to nULL
                     on success groupname is returned
                     on failure an error message is printed and the program exits

This changes were needed mainly for my new id applet.
It is somewhat bigger then the previous but matches the behaviour of GNU id
and is capable to handle usernames of whatever length.
BTW: at a first look it seems to me that it will integrate well (with just a few changes)
with the pending patch  in patches/id_groups_alias.patch.
The increase in size is balanced by the removal of my_getpwnamegid.c
from libbb as this was used only in previous id applet and by size optimizations
made possible in whoami.c and in passwd.c.
I know that we are in feature freeze but I think that i've tested it enough
(at least I hope so.......).


git-svn-id: svn://busybox.net/trunk/busybox@9194 69ca8d6d-28ef-0310-b511-8ec308f3f277

1 files changed, 87 insertions, 56 deletions

diff --git a/coreutils/id.c b/coreutils/id.c
index db8afc585..76331e48f 100644
--- a/coreutils/id.c
+++ b/coreutils/id.c
@@ -21,90 +21,121 @@
  */
 
 /* 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 "grp_.h"
+#include "pwd_.h"
 #include <stdio.h>
 #include <unistd.h>
 #include <getopt.h>
 #include <string.h>
 #include <sys/types.h>
+
 #ifdef CONFIG_SELINUX
 #include <proc_secure.h>
 #include <flask_util.h>
 #endif
 
-#define JUST_USER         1
-#define JUST_GROUP        2
-#define PRINT_REAL        4
-#define NAME_NOT_NUMBER   8
+#define PRINT_REAL        1
+#define NAME_NOT_NUMBER   2
+#define JUST_USER         4
+#define JUST_GROUP        8
+
+void printf_full(unsigned int id, char *arg, char prefix)
+{       
+        printf("%cid=%u",prefix, id);
+        if(arg)
+                printf("(%s) ", arg);
+}
 
 extern int id_main(int argc, char **argv)
 {
-        char user[32], group[32];
-        long pwnam, grnam;
-        int uid, gid;
+        struct passwd *p;
+        char *user;
+        char *group;
+        uid_t uid;
+        gid_t gid;
         int flags;
 #ifdef CONFIG_SELINUX
         int is_flask_enabled_flag = is_flask_enabled();
 #endif
 
-        flags = bb_getopt_ulflags(argc, argv, "ugrn");
+        bb_opt_complementaly = "u~g:g~u";
+        flags = bb_getopt_ulflags(argc, argv, "rnug");
 
-        if (((flags & (JUST_USER | JUST_GROUP)) == (JUST_USER | JUST_GROUP))
-                || (argc > optind + 1)
-        ) {
+        if ((flags & 0x80000000UL)
+         /* Don't allow -n -r -nr */
+        || (flags <= 3 && flags > 0) 
+        || (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])
+        {
 
-        if (argv[optind] == NULL) {
-                if (flags & PRINT_REAL) {
-                        uid = getuid();
-                        gid = getgid();
-                } else {
-                        uid = geteuid();
-                        gid = getegid();
-                }
-                my_getpwuid(user, uid, sizeof(user));
-        } else {
-                safe_strncpy(user, argv[optind], sizeof(user));
-            gid = my_getpwnamegid(user);
+                p=getpwnam(argv[optind]);
+                /* this is needed because it exits on failure */
+                uid = my_getpwnam(argv[optind]);
+                gid = p->pw_gid;
+                /* in this case PRINT_REAL is the same */ 
         }
-        my_getgrgid(group, gid, sizeof(group));
+        
+        user=my_getpwuid(NULL, uid, (flags & JUST_USER) ? -1 : 0);
 
-        pwnam=my_getpwnam(user);
-        grnam=my_getgrnam(group);
+        if(flags & JUST_USER)
+        {
+                gid=uid;
+                group=user;
+                goto PRINT; 
+        }
+        
+        group=my_getgrgid(NULL, gid, (flags & JUST_GROUP) ? -1 : 0);
 
-        if (flags & (JUST_GROUP | JUST_USER)) {
-                char *s = group;
-                if (flags & JUST_USER) {
-                        s = user;
-                        grnam = pwnam;
-                }
-                if (flags & NAME_NOT_NUMBER) {
-                        puts(s);
-                } else {
-                        printf("%ld\n", grnam);
-                }
-        } else {
-#ifdef CONFIG_SELINUX
-                printf("uid=%ld(%s) gid=%ld(%s)", pwnam, user, grnam, group);
-                if(is_flask_enabled_flag)
-                {
-                        security_id_t mysid = getsecsid();
-                        char context[80];
-                        int len = sizeof(context);
-                        context[0] = '\0';
-                        if(security_sid_to_context(mysid, context, &len))
-                                strcpy(context, "unknown");
-                        printf(" context=%s\n", context);
-                }
+        if(flags & JUST_GROUP) 
+        {
+PRINT:          
+                if(flags & NAME_NOT_NUMBER)
+                        puts(group);
                 else
-                        printf("\n");
-#else
-                printf("uid=%ld(%s) gid=%ld(%s)\n", pwnam, user, grnam, group);
+                        printf ("%u\n", gid);
+                bb_fflush_stdout_and_exit(EXIT_SUCCESS);
+        }
+        
+        /* Print full info like GNU id */
+        printf_full(uid, user, 'u');
+        printf_full(gid, group, 'g');
+#ifdef CONFIG_SELINUX
+        if(is_flask_enabled_flag)
+        {
+                security_id_t mysid = getsecsid();
+                char context[80];
+                int len = sizeof(context);
+                context[0] = '\0';
+                if(security_sid_to_context(mysid, context, &len))
+                        strcpy(context, "unknown");
+                printf("context=%s", context);
+        }
 #endif
+        puts("");
+        bb_fflush_stdout_and_exit((user && group) ? EXIT_SUCCESS : EXIT_FAILURE);
+}
 
-        }
+/* END CODE */
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/
 
-        bb_fflush_stdout_and_exit(0);
-}