migrate to gitlab

1 files changed, 147 insertions, 0 deletions

diff --git a/id.c b/id.c
new file mode 100644
index 0000000..7c91726
--- /dev/null
+++ b/id.c
@@ -0,0 +1,147 @@
+/*
+ * UNG's Not GNU
+ * 
+ * Copyright (c) 2011-2014, Jakob Kaivo <jakob@kaivo.net>
+ * 
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include <stdio.h>
+#include <pwd.h>
+#include <grp.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+const char *id_desc = "return user identity";
+const char *id_inv  = "id [user]\nid -G [-n] [user]\nid -g [-nr] user\nid -u [-nr] [user]";
+
+#define FULL	0
+#define NAMES	1
+#define NUMS	2
+
+void id_printgids (char *user, int mode)
+{
+  struct group *gr = NULL;
+  struct group *current = NULL;
+  int num_groups = 0;
+  char sep = ' ';
+  int i = 0;
+
+  setgrent();
+  while ((current = getgrent()) != NULL) {
+    for (i = 0; current->gr_mem[i] != NULL; i++) {
+      if (!strcmp (user, current->gr_mem[i])) {
+        num_groups++;
+        gr = realloc (gr, num_groups * sizeof(struct group));
+	gr[num_groups-1].gr_gid = current->gr_gid;
+        gr[num_groups-1].gr_name = strdup (current->gr_name);
+      } 
+    }
+  }
+  endgrent();
+
+  if (mode == FULL && num_groups > 0) {
+    printf (" groups=");
+    sep = ',';
+  }
+
+  while (i < num_groups) {
+    if (i > 0)
+      putchar (sep);
+    switch (mode) {
+      case NAMES:
+        printf ("%s", gr[i].gr_name);
+        break;
+      case NUMS:
+        printf ("%u", gr[i].gr_gid);
+        break;
+      default:
+        printf ("%u(%s)", gr[i].gr_gid, gr[i].gr_name);
+        break;
+    }
+    free (gr[i].gr_name);
+    i++;
+  }
+  free (gr);
+}
+
+int
+main (int argc, char **argv)
+{
+  int n = 0, r = 0;
+  char mode = 0;
+  int c;
+  struct passwd pw;
+  struct group gr;
+
+  while ((c = getopt (argc, argv, ":Ggunr")) != -1) {
+    switch (c) {
+      case 'G':
+      case 'g':
+      case 'u':
+        if (mode)
+          return 1;
+        mode = c;
+        break;
+      case 'n':
+        n = 1;
+        break;
+      case 'r':
+        r = 1;
+        break;
+      default:
+        return 1;
+    }
+  }
+
+  if ((mode == 0 && (n == 1 || r == 1)) || (mode == 'G' && r == 1))
+    return 1;
+  
+  if (optind >= argc)
+    pw = *getpwuid (mode == 'u' && r == 0 ? geteuid() : getuid());
+  else if (optind == argc -1)
+    pw = *getpwnam (argv[optind]);
+  else
+    return 1;
+
+  switch (mode) {
+    case 'G':
+      id_printgids (pw.pw_name, n ? NAMES : NUMS);
+      break;
+    case 'g':
+      gr = *getgrgid (r ? getgid() : getegid());
+      if (n) printf ("%s", gr.gr_name);
+      else printf ("%u", gr.gr_gid);
+      break;
+    case 'u':
+      if (n) printf ("%s", pw.pw_name);
+      else printf ("%u", pw.pw_uid);
+      break;
+    default:
+      gr = *getgrgid (pw.pw_uid == getuid() ? getgid() : pw.pw_gid);
+      printf ("uid=%u(%s) gid=%u(%s)", pw.pw_uid, pw.pw_name, gr.gr_gid, gr.gr_name);
+      if (pw.pw_uid != geteuid()) {
+        pw = *getpwuid (geteuid());
+        printf (" euid=%u(%s)", pw.pw_uid, pw.pw_name);
+      }
+      if (gr.gr_gid != getegid()) {
+        gr = *getgrgid (getegid());
+        printf (" egid=%u(%s)", gr.gr_gid, gr.gr_name);
+      }
+      id_printgids (pw.pw_name, FULL); 
+  }
+  printf ("\n");
+  return 0;
+}