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Diffstat (limited to 'lib/dns/include/dns/tcpmsg.h')
| -rw-r--r-- | lib/dns/include/dns/tcpmsg.h | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/lib/dns/include/dns/tcpmsg.h b/lib/dns/include/dns/tcpmsg.h new file mode 100644 index 0000000..df98cd7 --- /dev/null +++ b/lib/dns/include/dns/tcpmsg.h @@ -0,0 +1,143 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * SPDX-License-Identifier: MPL-2.0 + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, you can obtain one at https://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + +#ifndef DNS_TCPMSG_H +#define DNS_TCPMSG_H 1 + +/*! \file dns/tcpmsg.h */ + +#include <inttypes.h> + +#include <isc/buffer.h> +#include <isc/lang.h> +#include <isc/socket.h> + +typedef struct dns_tcpmsg { + /* private (don't touch!) */ + unsigned int magic; + uint16_t size; + isc_buffer_t buffer; + unsigned int maxsize; + isc_mem_t *mctx; + isc_socket_t *sock; + isc_task_t *task; + isc_taskaction_t action; + void *arg; + isc_event_t event; + /* public (read-only) */ + isc_result_t result; + isc_sockaddr_t address; +} dns_tcpmsg_t; + +ISC_LANG_BEGINDECLS + +void +dns_tcpmsg_init(isc_mem_t *mctx, isc_socket_t *sock, dns_tcpmsg_t *tcpmsg); +/*%< + * Associate a tcp message state with a given memory context and + * TCP socket. + * + * Requires: + * + *\li "mctx" and "sock" be non-NULL and valid types. + * + *\li "sock" be a read/write TCP socket. + * + *\li "tcpmsg" be non-NULL and an uninitialized or invalidated structure. + * + * Ensures: + * + *\li "tcpmsg" is a valid structure. + */ + +void +dns_tcpmsg_setmaxsize(dns_tcpmsg_t *tcpmsg, unsigned int maxsize); +/*%< + * Set the maximum packet size to "maxsize" + * + * Requires: + * + *\li "tcpmsg" be valid. + * + *\li 512 <= "maxsize" <= 65536 + */ + +isc_result_t +dns_tcpmsg_readmessage(dns_tcpmsg_t *tcpmsg, isc_task_t *task, + isc_taskaction_t action, void *arg); +/*%< + * Schedule an event to be delivered when a DNS message is readable, or + * when an error occurs on the socket. + * + * Requires: + * + *\li "tcpmsg" be valid. + * + *\li "task", "taskaction", and "arg" be valid. + * + * Returns: + * + *\li ISC_R_SUCCESS -- no error + *\li Anything that the isc_socket_recv() call can return. XXXMLG + * + * Notes: + * + *\li The event delivered is a fully generic event. It will contain no + * actual data. The sender will be a pointer to the dns_tcpmsg_t. + * The result code inside that structure should be checked to see + * what the final result was. + */ + +void +dns_tcpmsg_cancelread(dns_tcpmsg_t *tcpmsg); +/*%< + * Cancel a readmessage() call. The event will still be posted with a + * CANCELED result code. + * + * Requires: + * + *\li "tcpmsg" be valid. + */ + +void +dns_tcpmsg_keepbuffer(dns_tcpmsg_t *tcpmsg, isc_buffer_t *buffer); +/*%< + * If a dns buffer is to be kept between calls, this function marks the + * internal state-machine buffer as invalid, and copies all the contents + * of the state into "buffer". + * + * Requires: + * + *\li "tcpmsg" be valid. + * + *\li "buffer" be non-NULL. + */ + +void +dns_tcpmsg_invalidate(dns_tcpmsg_t *tcpmsg); +/*%< + * Clean up all allocated state, and invalidate the structure. + * + * Requires: + * + *\li "tcpmsg" be valid. + * + * Ensures: + * + *\li "tcpmsg" is invalidated and disassociated with all memory contexts, + * sockets, etc. + */ + +ISC_LANG_ENDDECLS + +#endif /* DNS_TCPMSG_H */ |