/*

 * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

/*

 * DTLS code by Eric Rescorla <ekr@rtfm.com>

 *

 * Copyright (C) 2006, Network Resonance, Inc. Copyright (C) 2011, RTFM, Inc.

 */

#include <stdio.h>

#include <openssl/objects.h>

#include "ssl_local.h"

#ifndef OPENSSL_NO_SRTP

static SRTP_PROTECTION_PROFILE srtp_known_profiles[] = {

    {

     "SRTP_AES128_CM_SHA1_80",

     SRTP_AES128_CM_SHA1_80,

     },

    {

     "SRTP_AES128_CM_SHA1_32",

     SRTP_AES128_CM_SHA1_32,

     },

    {

     "SRTP_AEAD_AES_128_GCM",

     SRTP_AEAD_AES_128_GCM,

     },

    {

     "SRTP_AEAD_AES_256_GCM",

     SRTP_AEAD_AES_256_GCM,

     },

    {0}

};

static int find_profile_by_name(char *profile_name,

                                SRTP_PROTECTION_PROFILE **pptr, size_t len)

{

    SRTP_PROTECTION_PROFILE *p;

    p = srtp_known_profiles;

    while (p->name) {

        if ((len == strlen(p->name))

            && strncmp(p->name, profile_name, len) == 0) {

            *pptr = p;

            return 0;

        }

        p++;

    }

    return 1;

}

static int ssl_ctx_make_profiles(const char *profiles_string,

                                 STACK_OF(SRTP_PROTECTION_PROFILE) **out)

{

    STACK_OF(SRTP_PROTECTION_PROFILE) *profiles;

    char *col;

    char *ptr = (char *)profiles_string;

    SRTP_PROTECTION_PROFILE *p;

    if ((profiles = sk_SRTP_PROTECTION_PROFILE_new_null()) == NULL) {

        SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,

               SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);

        return 1;

    }

    do {

        col = strchr(ptr, ':');

        if (!find_profile_by_name(ptr, &p, col ? (size_t)(col - ptr)

                                               : strlen(ptr))) {

            if (sk_SRTP_PROTECTION_PROFILE_find(profiles, p) >= 0) {

                SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,

                       SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);

                goto err;

            }

            if (!sk_SRTP_PROTECTION_PROFILE_push(profiles, p)) {

                SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,

                       SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);

                goto err;

            }

        } else {

            SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,

                   SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE);

            goto err;

        }

        if (col)

            ptr = col + 1;

    } while (col);

    sk_SRTP_PROTECTION_PROFILE_free(*out);

    *out = profiles;

    return 0;

 err:

    sk_SRTP_PROTECTION_PROFILE_free(profiles);

    return 1;

}

int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles)

{

    return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles);

}

int SSL_set_tlsext_use_srtp(SSL *s, const char *profiles)

{

    return ssl_ctx_make_profiles(profiles, &s->srtp_profiles);

}

STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s)

{

    if (s != NULL) {

        if (s->srtp_profiles != NULL) {

            return s->srtp_profiles;

        } else if ((s->ctx != NULL) && (s->ctx->srtp_profiles != NULL)) {

            return s->ctx->srtp_profiles;

        }

    }

    return NULL;

}

SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s)

{

    return s->srtp_profile;

}

#endif