From e171c3bfa8c2ab0fe28c90f94b51cc75679863bc Mon Sep 17 00:00:00 2001
From: mdw <mdw>
Date: Mon, 8 Jun 1998 11:21:22 +0000
Subject: [PATCH] Fixed bug in password and group file reading: strtok doesn't
 handle double colons nicely.

---
 src/userdb.c | 129 ++++++++++++++++++++++++++++++++++-------------------------
 1 file changed, 74 insertions(+), 55 deletions(-)

diff --git a/src/userdb.c b/src/userdb.c
index 05ace82..9151b70 100644
--- a/src/userdb.c
+++ b/src/userdb.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: userdb.c,v 1.7 1998/04/23 13:27:46 mdw Exp $
+ * $Id: userdb.c,v 1.8 1998/06/08 11:21:22 mdw Exp $
  *
  * User database management
  *
@@ -29,6 +29,10 @@
 /*----- Revision history --------------------------------------------------*
  *
  * $Log: userdb.c,v $
+ * Revision 1.8  1998/06/08 11:21:22  mdw
+ * Fixed bug in password and group file reading: strtok doesn't handle
+ * double colons nicely.
+ *
  * Revision 1.7  1998/04/23 13:27:46  mdw
  * Switch to using the ypstuff interface to YP server.
  *
@@ -248,6 +252,39 @@ static void userdb__dumpUser(const struct passwd *pw)
 
 #endif
 
+/* --- @userdb__split@ --- *
+ *
+ * Arguments:	@char *p@ = pointer to string
+ *		@char **v@ = pointer to vector to fill in
+ *		@int sz@ = maximum number of fields to split
+ *
+ * Returns:	Number of fields extracted.
+ *
+ * Use:		Splits a string into fields at colon characters.
+ */
+
+static int userdb__split(char *p, char **v, int sz)
+{
+  int count = 0;
+
+  *v++ = p; sz--; count++;
+  if (!sz)
+    goto done;
+  while (*p) {
+    if (*p++ == ':') {
+      p[-1] = 0;
+      *v++ = p; sz--; count++;
+      if (!sz)
+	goto done;
+    }
+  }
+  while (sz--)
+    *v++ = 0;
+
+done:
+  return (count);
+}
+
 /* --- @userdb_copyUser@ --- *
  *
  * Arguments:	@struct passwd *pw@ = pointer to block to copy
@@ -293,30 +330,21 @@ struct passwd *userdb_copyUser(struct passwd *pw)
 static struct passwd *userdb__buildUser(char *s)
 {
   struct passwd *pw = xmalloc(sizeof(*pw));
+  char *v[7];
 
-  s = strtok(s, ":"); if (!s) goto tidy_0; pw->pw_name = xstrdup(s);
-  s = strtok(0, ":"); if (!s) goto tidy_1; pw->pw_passwd = xstrdup(s);
-  s = strtok(0, ":"); if (!s) goto tidy_2; pw->pw_uid = (uid_t)atol(s);
-  s = strtok(0, ":"); if (!s) goto tidy_2; pw->pw_gid = (gid_t)atol(s);
-  s = strtok(0, ":"); if (!s) goto tidy_2; pw->pw_gecos = xstrdup(s);
-  s = strtok(0, ":"); if (!s) goto tidy_3; pw->pw_dir = xstrdup(s);
-  s = strtok(0, ":"); if (!s) goto tidy_4; pw->pw_shell = xstrdup(s);
-  return (pw);
-
-  /* --- Error handling --- */
-
-tidy_4:
-  free(pw->pw_dir);
-tidy_3:
-  free(pw->pw_gecos);
-tidy_2:
-  free(pw->pw_passwd);
-tidy_1:
-  free(pw->pw_name);
-tidy_0:
-  free(pw);
+  if (userdb__split(s, v, 7) < 7) {
+    free(pw);
+    return (0);
+  }
 
-  return (0);
+  pw->pw_name = xstrdup(v[0]);
+  pw->pw_passwd = xstrdup(v[1]);
+  pw->pw_uid = (uid_t)atol(v[2]);
+  pw->pw_gid = (gid_t)atol(v[3]);
+  pw->pw_gecos = xstrdup(v[4]);
+  pw->pw_dir = xstrdup(v[5]);
+  pw->pw_shell = xstrdup(v[6]);
+  return (pw);
 }
 
 /* --- @userdb_freeUser@ --- *
@@ -417,55 +445,46 @@ struct group *userdb_copyGroup(struct group *gr)
 static struct group *userdb__buildGroup(char *s)
 {
   struct group *gr = xmalloc(sizeof(*gr));
-  char *p;
+  char *v[4];
   int i;
 
   /* --- Do the easy bits --- */
 
-  s = strtok(s, ":"); if (!s) goto tidy_0; gr->gr_name = xstrdup(s);
-  s = strtok(0, ":"); if (!s) goto tidy_1; gr->gr_passwd = xstrdup(s);
-  s = strtok(0, ":"); if (!s) goto tidy_2; gr->gr_gid = (gid_t)atol(s);
-
-  /* --- Find the start of the member list --- */
-
-  s = strtok(0, "");
-  if (!s)
-    goto tidy_2;
+  if (userdb__split(s, v, 4) < 3) {
+    free(gr);
+    return (0);
+  }
+  gr->gr_name = xstrdup(v[0]);
+  gr->gr_passwd = xstrdup(v[1]);
+  gr->gr_gid = (gid_t)atol(v[2]);
 
   /* --- Count the number of members --- */
 
-  p = s;
+  s = v[3];
   i = 0;
-  for (;;) {
-    i++;
-    if ((p = strpbrk(p, ",")) == 0)
-      break;
-    p++;
+  if (s && s[0]) {
+    for (;;) {
+      i++;
+      if ((s = strpbrk(s, ",")) == 0)
+	break;
+      s++;
+    }
   }
 
   /* --- Allocate the block and fill it --- */
 
   gr->gr_mem = xmalloc((i + 1) * sizeof(char *));
   i = 0;
-  s = strtok(s, ",");
-  do {
-    gr->gr_mem[i++] = xstrdup(s);
-    s = strtok(0, ",");
-  } while (s);
+  if (v[3]) {
+    s = strtok(v[3], ",");
+    while (s) {
+      gr->gr_mem[i++] = xstrdup(s);
+      s = strtok(0, ",");
+    }
+  }
   gr->gr_mem[i] = 0;
 
   return (gr);
-
-  /* --- Various tidying-up things --- */
-
-tidy_2:
-  free(gr->gr_passwd);
-tidy_1:
-  free(gr->gr_name);
-tidy_0:
-  free(gr);
-
-  return (0);
 }
 
 /* --- @userdb_freeGroup@ --- *
-- 
2.11.0