* src/include/krb5/krb5.hin: Add prototype for krb5_copy_context

	* src/lib/krb5/krb/init_ctx.c (krb5_copy_context): New function to
	copy/clone an existing krb5 context.
	(copy_ktypes): Local helper function.

ticket: 2856
tags: pullup

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@18228 dc483132-0cff-0310-8789-dd5450dbe970

2 files changed, 83 insertions, 0 deletions

diff --git a/src/include/krb5/krb5.hin b/src/include/krb5/krb5.hin
index d786e6770c..9c8399847d 100644
--- a/src/include/krb5/krb5.hin
+++ b/src/include/krb5/krb5.hin
@@ -1343,6 +1343,8 @@ krb5_error_code KRB5_CALLCONV krb5_init_secure_context
 	(krb5_context *);
 void KRB5_CALLCONV krb5_free_context
 	(krb5_context);
+krb5_error_code KRB5_CALLCONV krb5_copy_context
+	(krb5_context, krb5_context *);
 
 #if KRB5_PRIVATE
 krb5_error_code krb5_set_default_in_tkt_ktypes
diff --git a/src/lib/krb5/krb/init_ctx.c b/src/lib/krb5/krb/init_ctx.c
index e1e1e755e7..85a3d144a0 100644
--- a/src/lib/krb5/krb/init_ctx.c
+++ b/src/lib/krb5/krb/init_ctx.c
@@ -485,3 +485,84 @@ krb5_is_permitted_enctype(krb5_context context, krb5_enctype etype)
 
     return(ret);
 }
+
+static krb5_error_code
+copy_ktypes(krb5_context ctx,
+	    unsigned int nktypes,
+	    krb5_enctype *oldktypes,
+	    krb5_enctype **newktypes)
+{
+    unsigned int i;
+
+    *newktypes = NULL;
+    if (!nktypes)
+	return 0;
+
+    *newktypes = malloc(nktypes * sizeof(krb5_enctype));
+    if (*newktypes == NULL)
+	return ENOMEM;
+    for (i = 0; i < nktypes; i++)
+	(*newktypes)[i] = oldktypes[i];
+    return 0;
+}
+
+krb5_error_code KRB5_CALLCONV
+krb5_copy_context(krb5_context ctx, krb5_context *nctx_out)
+{
+    krb5_error_code ret;
+    krb5_context nctx;
+
+    *nctx_out = NULL;
+    if (ctx == NULL)
+	return EINVAL;		/* XXX */
+
+    nctx = malloc(sizeof(krb5_context*));
+    *nctx = *ctx;
+
+    nctx->in_tkt_ktypes = NULL;
+    nctx->in_tkt_ktype_count = 0;
+    nctx->tgs_ktypes = NULL;
+    nctx->tgs_ktype_count = 0;
+    nctx->default_realm = NULL;
+    nctx->profile = NULL;
+    nctx->db_context = NULL;
+    nctx->ser_ctx_count = 0;
+    nctx->ser_ctx = NULL;
+    nctx->prompt_types = NULL;
+    nctx->os_context->default_ccname = NULL;
+
+    memset(&nctx->libkrb5_plugins, 0, sizeof(nctx->libkrb5_plugins));
+    nctx->vtbl = NULL;
+    nctx->locate_fptrs = NULL;
+
+    memset(&nctx->err, 0, sizeof(nctx->err));
+
+    ret = copy_ktypes(nctx, ctx->in_tkt_ktype_count,
+		      ctx->in_tkt_ktypes, &nctx->in_tkt_ktypes);
+    if (ret)
+	goto errout;
+    nctx->in_tkt_ktype_count = ctx->in_tkt_ktype_count;
+
+    ret = copy_ktypes(nctx, ctx->tgs_ktype_count,
+		      ctx->tgs_ktypes, &nctx->in_tkt_ktypes);
+    if (ret)
+	goto errout;
+    nctx->tgs_ktype_count = ctx->tgs_ktype_count;
+
+    nctx->os_context->default_ccname = strdup(ctx->os_context->default_ccname);
+    if (nctx->os_context->default_ccname == NULL) {
+	ret = ENOMEM;
+	goto errout;
+    }
+    ret = krb5_get_profile(ctx, &nctx->profile);
+    if (ret)
+	goto errout;
+
+errout:
+    if (ret) {
+	krb5_free_context(nctx);
+    } else {
+	*nctx_out = nctx;
+    }
+    return ret;
+}