149 lines
6.3 KiB
C
149 lines
6.3 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#ifndef foosdresolvehfoo
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#define foosdresolvehfoo
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/***
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This file is part of systemd.
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Copyright 2005-2014 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include "_sd-common.h"
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_SD_BEGIN_DECLARATIONS;
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/** An opaque sd-resolve session structure */
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typedef struct sd_resolve sd_resolve;
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/** An opaque sd-resolve query structure */
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typedef struct sd_resolve_query sd_resolve_query;
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/** Allocate a new sd-resolve session */
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int sd_resolve_new(sd_resolve **ret);
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/** Free a sd-resolve session. This destroys all attached
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* sd_resolve_query objects automatically */
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sd_resolve* sd_resolve_unref(sd_resolve *resolve);
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/** Return the UNIX file descriptor to poll() for events on. Use this
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* function to integrate sd-resolve with your custom main loop. */
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int sd_resolve_get_fd(sd_resolve *resolve);
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/** Return the poll() events (a combination of flags like POLLIN,
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* POLLOUT, ...) to check for. */
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int sd_resolve_get_events(sd_resolve *resolve);
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/** Return the poll() timeout to pass. Returns (uint64_t) -1 as time
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* out if no time out is needed */
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int sd_resolve_get_timeout(sd_resolve *resolve, uint64_t *timeout_usec);
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/** Process pending responses. After this function is called you can
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* get the next completed query object(s) using
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* sd_resolve_get_next(). */
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int sd_resolve_process(sd_resolve *resolve);
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/** Wait for a resolve event to complete */
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int sd_resolve_wait(sd_resolve *resolve, uint64_t timeout_usec);
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/** Issue a name to address query on the specified session. The
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* arguments are compatible with the ones of libc's
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* getaddrinfo(3). The function returns a new query object. When the
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* query is completed you may retrieve the results using
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* sd_resolve_getaddrinfo_done(). */
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int sd_resolve_getaddrinfo(sd_resolve *resolve, const char *node, const char *service, const struct addrinfo *hints, sd_resolve_query **q);
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/** Retrieve the results of a preceding sd_resolve_getaddrinfo()
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* call. Returns a addrinfo structure and a return value compatible
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* with libc's getaddrinfo(3). The query object q is destroyed by this
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* call and may not be used any further. Make sure to free the
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* returned addrinfo structure with sd_resolve_freeaddrinfo() and not
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* libc's freeaddrinfo(3)! If the query is not completed yet EAI_AGAIN
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* is returned. */
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int sd_resolve_getaddrinfo_done(sd_resolve_query* q, struct addrinfo **ret_ai);
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/** Free the addrinfo structure as returned by
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* sd_resolve_getaddrinfo_done(). Make sure to use this functions instead
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* of the libc's freeaddrinfo()! */
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void sd_resolve_freeaddrinfo(struct addrinfo *ai);
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/** Issue an address to name query on the specified session. The
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* arguments are compatible with the ones of libc's
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* getnameinfo(3). The function returns a new query object. When the
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* query is completed you may retrieve the results using
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* sd_resolve_getnameinfo_done(). Set gethost (resp. getserv) to non-zero
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* if you want to query the hostname (resp. the service name). */
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int sd_resolve_getnameinfo(sd_resolve *resolve, const struct sockaddr *sa, socklen_t salen, int flags, int gethost, int getserv, sd_resolve_query **q);
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/** Retrieve the results of a preceding sd_resolve_getnameinfo()
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* call. Returns the hostname and the service name in ret_host and
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* ret_serv. The query object q is destroyed by this call and may not
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* be used any further. If the query is not completed yet EAI_AGAIN is
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* returned. */
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int sd_resolve_getnameinfo_done(sd_resolve_query* q, char **ret_host, char **ret_serv);
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/** Issue a resolver query on the specified session. The arguments are
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* compatible with the ones of libc's res_query(3). The function returns a new
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* query object. When the query is completed you may retrieve the results using
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* sd_resolve_res_done(). */
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int sd_resolve_res_query(sd_resolve *resolve, const char *dname, int class, int type, sd_resolve_query **q);
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/** Issue an resolver query on the specified session. The arguments are
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* compatible with the ones of libc's res_search(3). The function returns a new
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* query object. When the query is completed you may retrieve the results using
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* sd_resolve_res_done(). */
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int sd_resolve_res_search(sd_resolve *resolve, const char *dname, int class, int type, sd_resolve_query **q);
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/** Retrieve the results of a preceding sd_resolve_res_query() or
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* resolve_res_search call. The query object q is destroyed by this
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* call and may not be used any further. Returns a pointer to the
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* answer of the res_query call. If the query is not completed yet
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* -EAGAIN is returned, on failure -errno is returned, otherwise the
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* length of answer is returned. */
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int sd_resolve_res_done(sd_resolve_query* q, unsigned char **answer);
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/** Return the next completed query object. If no query has been
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* completed yet, return NULL. Please note that you need to run
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* sd_resolve_wait() before this function will return sensible data. */
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int sd_resolve_get_next(sd_resolve *resolve, sd_resolve_query **q);
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/** Return the number of query objects (completed or not) attached to
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* this session */
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int sd_resolve_get_n_queries(sd_resolve *resolve);
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/** Cancel a currently running query. q is is destroyed by this call
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* and may not be used any futher. */
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int sd_resolve_cancel(sd_resolve_query* q);
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/** Returns non-zero when the query operation specified by q has been completed */
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int sd_resolve_is_done(sd_resolve_query*q);
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/** Assign some opaque userdata with a query object */
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void* sd_resolve_set_userdata(sd_resolve_query *q, void *userdata);
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/** Return userdata assigned to a query object. Use
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* sd_resolve_setuserdata() to set this data. If no data has been set
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* prior to this call it returns NULL. */
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void* sd_resolve_get_userdata(sd_resolve_query *q);
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_SD_END_DECLARATIONS;
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#endif
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