Annotation of embedaddon/strongswan/src/conftest/hooks/set_length.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 2010 Martin Willi
! 3: * Copyright (C) 2010 revosec AG
! 4: *
! 5: * This program is free software; you can redistribute it and/or modify it
! 6: * under the terms of the GNU General Public License as published by the
! 7: * Free Software Foundation; either version 2 of the License, or (at your
! 8: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
! 9: *
! 10: * This program is distributed in the hope that it will be useful, but
! 11: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! 12: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
! 13: * for more details.
! 14: */
! 15:
! 16: #include "hook.h"
! 17:
! 18: typedef struct private_set_length_t private_set_length_t;
! 19:
! 20: /**
! 21: * Private data of an set_length_t object.
! 22: */
! 23: struct private_set_length_t {
! 24:
! 25: /**
! 26: * Implements the hook_t interface.
! 27: */
! 28: hook_t hook;
! 29:
! 30: /**
! 31: * Alter requests or responses?
! 32: */
! 33: bool req;
! 34:
! 35: /**
! 36: * ID of message to alter.
! 37: */
! 38: int id;
! 39:
! 40: /**
! 41: * Payload type
! 42: */
! 43: char *type;
! 44:
! 45: /**
! 46: * Difference to correct length
! 47: */
! 48: int diff;
! 49: };
! 50:
! 51: METHOD(listener_t, message, bool,
! 52: private_set_length_t *this, ike_sa_t *ike_sa, message_t *message,
! 53: bool incoming, bool plain)
! 54: {
! 55: if (!incoming && plain &&
! 56: message->get_request(message) == this->req &&
! 57: message->get_message_id(message) == this->id)
! 58: {
! 59: payload_t *payload;
! 60: enumerator_t *enumerator;
! 61: payload_type_t type;
! 62:
! 63: type = atoi(this->type);
! 64: if (!type)
! 65: {
! 66: if (!enum_from_name(payload_type_short_names, this->type, &type))
! 67: {
! 68: DBG1(DBG_CFG, "unknown payload: '%s', skipped", this->type);
! 69: return TRUE;
! 70: }
! 71: }
! 72: enumerator = message->create_payload_enumerator(message);
! 73: while (enumerator->enumerate(enumerator, &payload))
! 74: {
! 75: if (type == payload->get_type(payload))
! 76: {
! 77: encoding_rule_t *rules;
! 78: uint16_t *len;
! 79: int i, count;
! 80:
! 81: count = payload->get_encoding_rules(payload, &rules);
! 82: for (i = 0; i < count; i++)
! 83: {
! 84: if (rules[i].type == PAYLOAD_LENGTH)
! 85: {
! 86: len = (uint16_t*)(((void*)payload) + rules[i].offset);
! 87: DBG1(DBG_CFG, "adjusting length of %N payload "
! 88: "from %d to %d", payload_type_short_names, type,
! 89: *len, *len + this->diff);
! 90: *len = *len + this->diff;
! 91: }
! 92: }
! 93: }
! 94: }
! 95: enumerator->destroy(enumerator);
! 96: }
! 97: return TRUE;
! 98: }
! 99:
! 100: METHOD(hook_t, destroy, void,
! 101: private_set_length_t *this)
! 102: {
! 103: free(this);
! 104: }
! 105:
! 106: /**
! 107: * Create the IKE_AUTH fill hook
! 108: */
! 109: hook_t *set_length_hook_create(char *name)
! 110: {
! 111: private_set_length_t *this;
! 112:
! 113: INIT(this,
! 114: .hook = {
! 115: .listener = {
! 116: .message = _message,
! 117: },
! 118: .destroy = _destroy,
! 119: },
! 120: .req = conftest->test->get_bool(conftest->test,
! 121: "hooks.%s.request", TRUE, name),
! 122: .id = conftest->test->get_int(conftest->test,
! 123: "hooks.%s.id", 0, name),
! 124: .type = conftest->test->get_str(conftest->test,
! 125: "hooks.%s.type", "", name),
! 126: .diff = conftest->test->get_int(conftest->test,
! 127: "hooks.%s.diff", 0, name),
! 128: );
! 129:
! 130: return &this->hook;
! 131: }
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