+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2005-2008 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <assert.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <unistd.h>
-#include <sys/select.h>
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <sys/wait.h>
-#include <sys/types.h>
-#include <pwd.h>
-#include <netinet/in.h>
-#include <arpa/nameser.h>
-#include <resolv.h>
-#include <dirent.h>
-#include <sys/time.h>
-#include <sys/resource.h>
-#include <stdint.h>
-#include <pthread.h>
-#include <sys/prctl.h>
-
-#include "sd-dns.h"
-#include "util.h"
-
-#define MAX_WORKERS 16
-#define MAX_QUERIES 256
-#define BUFSIZE (10240)
-
-typedef enum {
- REQUEST_ADDRINFO,
- RESPONSE_ADDRINFO,
- REQUEST_NAMEINFO,
- RESPONSE_NAMEINFO,
- REQUEST_RES_QUERY,
- REQUEST_RES_SEARCH,
- RESPONSE_RES,
- REQUEST_TERMINATE,
- RESPONSE_DIED
-} query_type_t;
-
-enum {
- REQUEST_RECV_FD = 0,
- REQUEST_SEND_FD = 1,
- RESPONSE_RECV_FD = 2,
- RESPONSE_SEND_FD = 3,
- MESSAGE_FD_MAX = 4
-};
-
-struct asyncns {
- int fds[MESSAGE_FD_MAX];
-
- pthread_t workers[MAX_WORKERS];
- unsigned valid_workers;
-
- unsigned current_id, current_index;
- asyncns_query_t* queries[MAX_QUERIES];
-
- asyncns_query_t *done_head, *done_tail;
-
- int n_queries;
- int dead;
-};
-
-struct asyncns_query {
- asyncns_t *asyncns;
- int done;
- unsigned id;
- query_type_t type;
- asyncns_query_t *done_next, *done_prev;
- int ret;
- int _errno;
- int _h_errno;
- struct addrinfo *addrinfo;
- char *serv, *host;
- void *userdata;
-};
-
-typedef struct rheader {
- query_type_t type;
- unsigned id;
- size_t length;
-} rheader_t;
-
-typedef struct addrinfo_request {
- struct rheader header;
- int hints_is_null;
- int ai_flags;
- int ai_family;
- int ai_socktype;
- int ai_protocol;
- size_t node_len, service_len;
-} addrinfo_request_t;
-
-typedef struct addrinfo_response {
- struct rheader header;
- int ret;
- int _errno;
- int _h_errno;
- /* followed by addrinfo_serialization[] */
-} addrinfo_response_t;
-
-typedef struct addrinfo_serialization {
- int ai_flags;
- int ai_family;
- int ai_socktype;
- int ai_protocol;
- size_t ai_addrlen;
- size_t canonname_len;
- /* Followed by ai_addr amd ai_canonname with variable lengths */
-} addrinfo_serialization_t;
-
-typedef struct nameinfo_request {
- struct rheader header;
- int flags;
- socklen_t sockaddr_len;
- int gethost, getserv;
-} nameinfo_request_t;
-
-typedef struct nameinfo_response {
- struct rheader header;
- size_t hostlen, servlen;
- int ret;
- int _errno;
- int _h_errno;
-} nameinfo_response_t;
-
-typedef struct res_request {
- struct rheader header;
- int class;
- int type;
- size_t dname_len;
-} res_request_t;
-
-typedef struct res_response {
- struct rheader header;
- int ret;
- int _errno;
- int _h_errno;
-} res_response_t;
-
-typedef union packet {
- rheader_t rheader;
- addrinfo_request_t addrinfo_request;
- addrinfo_response_t addrinfo_response;
- nameinfo_request_t nameinfo_request;
- nameinfo_response_t nameinfo_response;
- res_request_t res_request;
- res_response_t res_response;
-} packet_t;
-
-static int send_died(int out_fd) {
- rheader_t rh = {};
- assert(out_fd > 0);
-
- rh.type = RESPONSE_DIED;
- rh.id = 0;
- rh.length = sizeof(rh);
-
- return send(out_fd, &rh, rh.length, MSG_NOSIGNAL);
-}
-
-static void *serialize_addrinfo(void *p, const struct addrinfo *ai, size_t *length, size_t maxlength) {
- addrinfo_serialization_t s;
- size_t cnl, l;
- assert(p);
- assert(ai);
- assert(length);
- assert(*length <= maxlength);
-
- cnl = (ai->ai_canonname ? strlen(ai->ai_canonname)+1 : 0);
- l = sizeof(addrinfo_serialization_t) + ai->ai_addrlen + cnl;
-
- if (*length + l > maxlength)
- return NULL;
-
- s.ai_flags = ai->ai_flags;
- s.ai_family = ai->ai_family;
- s.ai_socktype = ai->ai_socktype;
- s.ai_protocol = ai->ai_protocol;
- s.ai_addrlen = ai->ai_addrlen;
- s.canonname_len = cnl;
-
- memcpy((uint8_t*) p, &s, sizeof(addrinfo_serialization_t));
- memcpy((uint8_t*) p + sizeof(addrinfo_serialization_t), ai->ai_addr, ai->ai_addrlen);
-
- if (ai->ai_canonname)
- strcpy((char*) p + sizeof(addrinfo_serialization_t) + ai->ai_addrlen, ai->ai_canonname);
-
- *length += l;
- return (uint8_t*) p + l;
-}
-
-static int send_addrinfo_reply(int out_fd, unsigned id, int ret, struct addrinfo *ai, int _errno, int _h_errno) {
- addrinfo_response_t data[BUFSIZE/sizeof(addrinfo_response_t) + 1] = {};
- addrinfo_response_t *resp = data;
- assert(out_fd >= 0);
-
- resp->header.type = RESPONSE_ADDRINFO;
- resp->header.id = id;
- resp->header.length = sizeof(addrinfo_response_t);
- resp->ret = ret;
- resp->_errno = _errno;
- resp->_h_errno = _h_errno;
-
- if (ret == 0 && ai) {
- void *p = data + 1;
- struct addrinfo *k;
-
- for (k = ai; k; k = k->ai_next) {
- p = serialize_addrinfo(p, k, &resp->header.length, (char*) data + BUFSIZE - (char*) p);
- if (!p) {
- resp->ret = EAI_MEMORY;
- break;
- }
- }
- }
-
- if (ai)
- freeaddrinfo(ai);
-
- return send(out_fd, resp, resp->header.length, MSG_NOSIGNAL);
-}
-
-static int send_nameinfo_reply(int out_fd, unsigned id, int ret, const char *host, const char *serv, int _errno, int _h_errno) {
- nameinfo_response_t data[BUFSIZE/sizeof(nameinfo_response_t) + 1] = {};
- size_t hl, sl;
- nameinfo_response_t *resp = data;
-
- assert(out_fd >= 0);
-
- sl = serv ? strlen(serv)+1 : 0;
- hl = host ? strlen(host)+1 : 0;
-
- resp->header.type = RESPONSE_NAMEINFO;
- resp->header.id = id;
- resp->header.length = sizeof(nameinfo_response_t) + hl + sl;
- resp->ret = ret;
- resp->_errno = _errno;
- resp->_h_errno = _h_errno;
- resp->hostlen = hl;
- resp->servlen = sl;
-
- assert(sizeof(data) >= resp->header.length);
-
- if (host)
- memcpy((uint8_t *)data + sizeof(nameinfo_response_t), host, hl);
-
- if (serv)
- memcpy((uint8_t *)data + sizeof(nameinfo_response_t) + hl, serv, sl);
-
- return send(out_fd, resp, resp->header.length, MSG_NOSIGNAL);
-}
-
-static int send_res_reply(int out_fd, unsigned id, const unsigned char *answer, int ret, int _errno, int _h_errno) {
- res_response_t data[BUFSIZE/sizeof(res_response_t) + 1] = {};
- res_response_t *resp = data;
-
- assert(out_fd >= 0);
-
- resp->header.type = RESPONSE_RES;
- resp->header.id = id;
- resp->header.length = sizeof(res_response_t) + (ret < 0 ? 0 : ret);
- resp->ret = ret;
- resp->_errno = _errno;
- resp->_h_errno = _h_errno;
-
- assert(sizeof(data) >= resp->header.length);
-
- if (ret > 0)
- memcpy((uint8_t *)data + sizeof(res_response_t), answer, ret);
-
- return send(out_fd, resp, resp->header.length, MSG_NOSIGNAL);
-}
-
-static int handle_request(int out_fd, const packet_t *packet, size_t length) {
- const rheader_t *req;
- assert(out_fd >= 0);
-
- req = &packet->rheader;
- assert(req);
- assert(length >= sizeof(rheader_t));
- assert(length == req->length);
-
- switch (req->type) {
- case REQUEST_ADDRINFO: {
- struct addrinfo ai = {}, *result = NULL;
- const addrinfo_request_t *ai_req = &packet->addrinfo_request;
- const char *node, *service;
- int ret;
-
- assert(length >= sizeof(addrinfo_request_t));
- assert(length == sizeof(addrinfo_request_t) + ai_req->node_len + ai_req->service_len);
-
- ai.ai_flags = ai_req->ai_flags;
- ai.ai_family = ai_req->ai_family;
- ai.ai_socktype = ai_req->ai_socktype;
- ai.ai_protocol = ai_req->ai_protocol;
-
- node = ai_req->node_len ? (const char*) ai_req + sizeof(addrinfo_request_t) : NULL;
- service = ai_req->service_len ? (const char*) ai_req + sizeof(addrinfo_request_t) + ai_req->node_len : NULL;
-
- ret = getaddrinfo(node, service,
- ai_req->hints_is_null ? NULL : &ai,
- &result);
-
- /* send_addrinfo_reply() frees result */
- return send_addrinfo_reply(out_fd, req->id, ret, result, errno, h_errno);
- }
-
- case REQUEST_NAMEINFO: {
- int ret;
- const nameinfo_request_t *ni_req = &packet->nameinfo_request;
- char hostbuf[NI_MAXHOST], servbuf[NI_MAXSERV];
- struct sockaddr_storage sa;
-
- assert(length >= sizeof(nameinfo_request_t));
- assert(length == sizeof(nameinfo_request_t) + ni_req->sockaddr_len);
-
- memcpy(&sa, (const uint8_t *) ni_req + sizeof(nameinfo_request_t), ni_req->sockaddr_len);
-
- ret = getnameinfo((struct sockaddr *)&sa, ni_req->sockaddr_len,
- ni_req->gethost ? hostbuf : NULL, ni_req->gethost ? sizeof(hostbuf) : 0,
- ni_req->getserv ? servbuf : NULL, ni_req->getserv ? sizeof(servbuf) : 0,
- ni_req->flags);
-
- return send_nameinfo_reply(out_fd, req->id, ret,
- ret == 0 && ni_req->gethost ? hostbuf : NULL,
- ret == 0 && ni_req->getserv ? servbuf : NULL,
- errno, h_errno);
- }
-
- case REQUEST_RES_QUERY:
- case REQUEST_RES_SEARCH: {
- int ret;
- HEADER answer[BUFSIZE/sizeof(HEADER) + 1];
- const res_request_t *res_req = &packet->res_request;
- const char *dname;
-
- assert(length >= sizeof(res_request_t));
- assert(length == sizeof(res_request_t) + res_req->dname_len);
-
- dname = (const char *) req + sizeof(res_request_t);
-
- if (req->type == REQUEST_RES_QUERY)
- ret = res_query(dname, res_req->class, res_req->type, (unsigned char *) answer, BUFSIZE);
- else
- ret = res_search(dname, res_req->class, res_req->type, (unsigned char *) answer, BUFSIZE);
-
- return send_res_reply(out_fd, req->id, (unsigned char *) answer, ret, errno, h_errno);
- }
-
- case REQUEST_TERMINATE:
- /* Quit */
- return -1;
-
- default:
- ;
- }
-
- return 0;
-}
-
-static void* thread_worker(void *p) {
- asyncns_t *asyncns = p;
- sigset_t fullset;
-
- /* No signals in this thread please */
- sigfillset(&fullset);
- pthread_sigmask(SIG_BLOCK, &fullset, NULL);
-
- while (!asyncns->dead) {
- packet_t buf[BUFSIZE/sizeof(packet_t) + 1];
- ssize_t length;
-
- length = recv(asyncns->fds[REQUEST_RECV_FD], buf, sizeof(buf), 0);
-
- if (length <= 0) {
- if (length < 0 && (errno == EAGAIN || errno == EINTR))
- continue;
- break;
- }
-
- if (asyncns->dead)
- break;
-
- if (handle_request(asyncns->fds[RESPONSE_SEND_FD], buf, (size_t) length) < 0)
- break;
- }
-
- send_died(asyncns->fds[RESPONSE_SEND_FD]);
-
- return NULL;
-}
-
-asyncns_t* asyncns_new(unsigned n_proc) {
- int i;
- asyncns_t *asyncns = NULL;
-
- assert(n_proc >= 1);
-
- if (n_proc > MAX_WORKERS)
- n_proc = MAX_WORKERS;
-
- asyncns = malloc(sizeof(asyncns_t));
- if (!asyncns) {
- errno = ENOMEM;
- goto fail;
- }
-
- asyncns->dead = 0;
- asyncns->valid_workers = 0;
-
- for (i = 0; i < MESSAGE_FD_MAX; i++)
- asyncns->fds[i] = -1;
-
- memset(asyncns->queries, 0, sizeof(asyncns->queries));
-
-#ifdef SOCK_CLOEXEC
- if (socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, asyncns->fds) < 0 ||
- socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, asyncns->fds+2) < 0) {
-
- /* Try again, without SOCK_CLOEXEC */
- if (errno == EINVAL) {
-#endif
- if (socketpair(PF_UNIX, SOCK_DGRAM, 0, asyncns->fds) < 0 ||
- socketpair(PF_UNIX, SOCK_DGRAM, 0, asyncns->fds+2) < 0)
- goto fail;
-#ifdef SOCK_CLOEXEC
- } else
- goto fail;
- }
-#endif
-
- for (i = 0; i < MESSAGE_FD_MAX; i++)
- fd_cloexec(asyncns->fds[i], true);
-
- for (asyncns->valid_workers = 0; asyncns->valid_workers < n_proc; asyncns->valid_workers++) {
- int r;
- r = pthread_create(&asyncns->workers[asyncns->valid_workers], NULL, thread_worker, asyncns);
- if (r) {
- errno = r;
- goto fail;
- }
- }
-
- asyncns->current_index = asyncns->current_id = 0;
- asyncns->done_head = asyncns->done_tail = NULL;
- asyncns->n_queries = 0;
-
- fd_nonblock(asyncns->fds[RESPONSE_RECV_FD], true);
-
- return asyncns;
-
-fail:
- if (asyncns)
- asyncns_free(asyncns);
-
- return NULL;
-}
-
-void asyncns_free(asyncns_t *asyncns) {
- int i;
- int saved_errno = errno;
- unsigned p;
-
- assert(asyncns);
-
- asyncns->dead = 1;
-
- if (asyncns->fds[REQUEST_SEND_FD] >= 0) {
- rheader_t req = {};
-
- req.type = REQUEST_TERMINATE;
- req.length = sizeof(req);
- req.id = 0;
-
- /* Send one termination packet for each worker */
- for (p = 0; p < asyncns->valid_workers; p++)
- send(asyncns->fds[REQUEST_SEND_FD], &req, req.length, MSG_NOSIGNAL);
- }
-
- /* Now terminate them and wait until they are gone. */
- for (p = 0; p < asyncns->valid_workers; p++) {
- for (;;) {
- if (pthread_join(asyncns->workers[p], NULL) != EINTR)
- break;
- }
- }
-
- /* Close all communication channels */
- for (i = 0; i < MESSAGE_FD_MAX; i++)
- if (asyncns->fds[i] >= 0)
- close(asyncns->fds[i]);
-
- for (p = 0; p < MAX_QUERIES; p++)
- if (asyncns->queries[p])
- asyncns_cancel(asyncns, asyncns->queries[p]);
-
- free(asyncns);
-
- errno = saved_errno;
-}
-
-int asyncns_fd(asyncns_t *asyncns) {
- assert(asyncns);
-
- return asyncns->fds[RESPONSE_RECV_FD];
-}
-
-static asyncns_query_t *lookup_query(asyncns_t *asyncns, unsigned id) {
- asyncns_query_t *q;
- assert(asyncns);
-
- q = asyncns->queries[id % MAX_QUERIES];
- if (q)
- if (q->id == id)
- return q;
-
- return NULL;
-}
-
-static void complete_query(asyncns_t *asyncns, asyncns_query_t *q) {
- assert(asyncns);
- assert(q);
- assert(!q->done);
-
- q->done = 1;
-
- if ((q->done_prev = asyncns->done_tail))
- asyncns->done_tail->done_next = q;
- else
- asyncns->done_head = q;
-
- asyncns->done_tail = q;
- q->done_next = NULL;
-}
-
-static const void *unserialize_addrinfo(const void *p, struct addrinfo **ret_ai, size_t *length) {
- addrinfo_serialization_t s;
- size_t l;
- struct addrinfo *ai;
- assert(p);
- assert(ret_ai);
- assert(length);
-
- if (*length < sizeof(addrinfo_serialization_t))
- return NULL;
-
- memcpy(&s, p, sizeof(s));
-
- l = sizeof(addrinfo_serialization_t) + s.ai_addrlen + s.canonname_len;
- if (*length < l)
- return NULL;
-
- ai = malloc(sizeof(struct addrinfo));
- if (!ai)
- goto fail;
-
- ai->ai_addr = NULL;
- ai->ai_canonname = NULL;
- ai->ai_next = NULL;
-
- if (s.ai_addrlen && !(ai->ai_addr = malloc(s.ai_addrlen)))
- goto fail;
-
- if (s.canonname_len && !(ai->ai_canonname = malloc(s.canonname_len)))
- goto fail;
-
- ai->ai_flags = s.ai_flags;
- ai->ai_family = s.ai_family;
- ai->ai_socktype = s.ai_socktype;
- ai->ai_protocol = s.ai_protocol;
- ai->ai_addrlen = s.ai_addrlen;
-
- if (ai->ai_addr)
- memcpy(ai->ai_addr, (const uint8_t*) p + sizeof(addrinfo_serialization_t), s.ai_addrlen);
-
- if (ai->ai_canonname)
- memcpy(ai->ai_canonname, (const uint8_t*) p + sizeof(addrinfo_serialization_t) + s.ai_addrlen, s.canonname_len);
-
- *length -= l;
- *ret_ai = ai;
-
- return (const uint8_t*) p + l;
-
-
-fail:
- if (ai)
- asyncns_freeaddrinfo(ai);
-
- return NULL;
-}
-
-static int handle_response(asyncns_t *asyncns, const packet_t *packet, size_t length) {
- const rheader_t *resp;
- asyncns_query_t *q;
-
- assert(asyncns);
-
- resp = &packet->rheader;
- assert(resp);
- assert(length >= sizeof(rheader_t));
- assert(length == resp->length);
-
- if (resp->type == RESPONSE_DIED) {
- asyncns->dead = 1;
- return 0;
- }
-
- q = lookup_query(asyncns, resp->id);
- if (!q)
- return 0;
-
- switch (resp->type) {
- case RESPONSE_ADDRINFO: {
- const addrinfo_response_t *ai_resp = &packet->addrinfo_response;
- const void *p;
- size_t l;
- struct addrinfo *prev = NULL;
-
- assert(length >= sizeof(addrinfo_response_t));
- assert(q->type == REQUEST_ADDRINFO);
-
- q->ret = ai_resp->ret;
- q->_errno = ai_resp->_errno;
- q->_h_errno = ai_resp->_h_errno;
- l = length - sizeof(addrinfo_response_t);
- p = (const uint8_t*) resp + sizeof(addrinfo_response_t);
-
- while (l > 0 && p) {
- struct addrinfo *ai = NULL;
- p = unserialize_addrinfo(p, &ai, &l);
-
- if (!p || !ai) {
- q->ret = EAI_MEMORY;
- break;
- }
-
- if (prev)
- prev->ai_next = ai;
- else
- q->addrinfo = ai;
-
- prev = ai;
- }
-
- complete_query(asyncns, q);
- break;
- }
-
- case RESPONSE_NAMEINFO: {
- const nameinfo_response_t *ni_resp = &packet->nameinfo_response;
-
- assert(length >= sizeof(nameinfo_response_t));
- assert(q->type == REQUEST_NAMEINFO);
-
- q->ret = ni_resp->ret;
- q->_errno = ni_resp->_errno;
- q->_h_errno = ni_resp->_h_errno;
-
- if (ni_resp->hostlen)
- if (!(q->host = strndup((const char*) ni_resp + sizeof(nameinfo_response_t), ni_resp->hostlen-1)))
- q->ret = EAI_MEMORY;
-
- if (ni_resp->servlen)
- if (!(q->serv = strndup((const char*) ni_resp + sizeof(nameinfo_response_t) + ni_resp->hostlen, ni_resp->servlen-1)))
- q->ret = EAI_MEMORY;
-
- complete_query(asyncns, q);
- break;
- }
-
- case RESPONSE_RES: {
- const res_response_t *res_resp = &packet->res_response;
-
- assert(length >= sizeof(res_response_t));
- assert(q->type == REQUEST_RES_QUERY || q->type == REQUEST_RES_SEARCH);
-
- q->ret = res_resp->ret;
- q->_errno = res_resp->_errno;
- q->_h_errno = res_resp->_h_errno;
-
- if (res_resp->ret >= 0) {
- if (!(q->serv = malloc(res_resp->ret))) {
- q->ret = -1;
- q->_errno = ENOMEM;
- } else
- memcpy(q->serv, (const char *)resp + sizeof(res_response_t), res_resp->ret);
- }
-
- complete_query(asyncns, q);
- break;
- }
-
- default:
- ;
- }
-
- return 0;
-}
-
-int asyncns_wait(asyncns_t *asyncns, int block) {
- int handled = 0;
- assert(asyncns);
-
- for (;;) {
- packet_t buf[BUFSIZE/sizeof(packet_t) + 1];
- ssize_t l;
-
- if (asyncns->dead) {
- errno = ECHILD;
- return -1;
- }
-
- l = recv(asyncns->fds[RESPONSE_RECV_FD], buf, sizeof(buf), 0);
- if (l < 0) {
- fd_set fds;
-
- if (errno != EAGAIN)
- return -1;
-
- if (!block || handled)
- return 0;
-
- FD_ZERO(&fds);
- FD_SET(asyncns->fds[RESPONSE_RECV_FD], &fds);
-
- if (select(asyncns->fds[RESPONSE_RECV_FD]+1, &fds, NULL, NULL, NULL) < 0)
- return -1;
-
- continue;
- }
-
- if (handle_response(asyncns, buf, (size_t) l) < 0)
- return -1;
-
- handled = 1;
- }
-}
-
-static asyncns_query_t *alloc_query(asyncns_t *asyncns) {
- asyncns_query_t *q;
- assert(asyncns);
-
- if (asyncns->n_queries >= MAX_QUERIES) {
- errno = ENOMEM;
- return NULL;
- }
-
- while (asyncns->queries[asyncns->current_index]) {
- asyncns->current_index++;
- asyncns->current_id++;
-
- while (asyncns->current_index >= MAX_QUERIES)
- asyncns->current_index -= MAX_QUERIES;
- }
-
- q = asyncns->queries[asyncns->current_index] = malloc(sizeof(asyncns_query_t));
- if (!q) {
- errno = ENOMEM;
- return NULL;
- }
-
- asyncns->n_queries++;
-
- q->asyncns = asyncns;
- q->done = 0;
- q->id = asyncns->current_id;
- q->done_next = q->done_prev = NULL;
- q->ret = 0;
- q->_errno = 0;
- q->_h_errno = 0;
- q->addrinfo = NULL;
- q->userdata = NULL;
- q->host = q->serv = NULL;
-
- return q;
-}
-
-asyncns_query_t* asyncns_getaddrinfo(asyncns_t *asyncns, const char *node, const char *service, const struct addrinfo *hints) {
- addrinfo_request_t data[BUFSIZE/sizeof(addrinfo_request_t) + 1] = {};
- addrinfo_request_t *req = data;
- asyncns_query_t *q;
- assert(asyncns);
- assert(node || service);
-
- if (asyncns->dead) {
- errno = ECHILD;
- return NULL;
- }
-
- q = alloc_query(asyncns);
- if (!q)
- return NULL;
-
- req->node_len = node ? strlen(node)+1 : 0;
- req->service_len = service ? strlen(service)+1 : 0;
-
- req->header.id = q->id;
- req->header.type = q->type = REQUEST_ADDRINFO;
- req->header.length = sizeof(addrinfo_request_t) + req->node_len + req->service_len;
-
- if (req->header.length > BUFSIZE) {
- errno = ENOMEM;
- goto fail;
- }
-
- if (!(req->hints_is_null = !hints)) {
- req->ai_flags = hints->ai_flags;
- req->ai_family = hints->ai_family;
- req->ai_socktype = hints->ai_socktype;
- req->ai_protocol = hints->ai_protocol;
- }
-
- if (node)
- strcpy((char*) req + sizeof(addrinfo_request_t), node);
-
- if (service)
- strcpy((char*) req + sizeof(addrinfo_request_t) + req->node_len, service);
-
- if (send(asyncns->fds[REQUEST_SEND_FD], req, req->header.length, MSG_NOSIGNAL) < 0)
- goto fail;
-
- return q;
-
-fail:
- if (q)
- asyncns_cancel(asyncns, q);
-
- return NULL;
-}
-
-int asyncns_getaddrinfo_done(asyncns_t *asyncns, asyncns_query_t* q, struct addrinfo **ret_res) {
- int ret;
- assert(asyncns);
- assert(q);
- assert(q->asyncns == asyncns);
- assert(q->type == REQUEST_ADDRINFO);
-
- if (asyncns->dead) {
- errno = ECHILD;
- return EAI_SYSTEM;
- }
-
- if (!q->done)
- return EAI_AGAIN;
-
- *ret_res = q->addrinfo;
- q->addrinfo = NULL;
-
- ret = q->ret;
-
- if (ret == EAI_SYSTEM)
- errno = q->_errno;
-
- if (ret != 0)
- h_errno = q->_h_errno;
-
- asyncns_cancel(asyncns, q);
-
- return ret;
-}
-
-asyncns_query_t* asyncns_getnameinfo(asyncns_t *asyncns, const struct sockaddr *sa, socklen_t salen, int flags, int gethost, int getserv) {
- nameinfo_request_t data[BUFSIZE/sizeof(nameinfo_request_t) + 1] = {};
- nameinfo_request_t *req = data;
- asyncns_query_t *q;
-
- assert(asyncns);
- assert(sa);
- assert(salen > 0);
-
- if (asyncns->dead) {
- errno = ECHILD;
- return NULL;
- }
-
- q = alloc_query(asyncns);
- if (!q)
- return NULL;
-
- req->header.id = q->id;
- req->header.type = q->type = REQUEST_NAMEINFO;
- req->header.length = sizeof(nameinfo_request_t) + salen;
-
- if (req->header.length > BUFSIZE) {
- errno = ENOMEM;
- goto fail;
- }
-
- req->flags = flags;
- req->sockaddr_len = salen;
- req->gethost = gethost;
- req->getserv = getserv;
-
- memcpy((uint8_t*) req + sizeof(nameinfo_request_t), sa, salen);
-
- if (send(asyncns->fds[REQUEST_SEND_FD], req, req->header.length, MSG_NOSIGNAL) < 0)
- goto fail;
-
- return q;
-
-fail:
- if (q)
- asyncns_cancel(asyncns, q);
-
- return NULL;
-}
-
-int asyncns_getnameinfo_done(asyncns_t *asyncns, asyncns_query_t* q, char *ret_host, size_t hostlen, char *ret_serv, size_t servlen) {
- int ret;
- assert(asyncns);
- assert(q);
- assert(q->asyncns == asyncns);
- assert(q->type == REQUEST_NAMEINFO);
- assert(!ret_host || hostlen);
- assert(!ret_serv || servlen);
-
- if (asyncns->dead) {
- errno = ECHILD;
- return EAI_SYSTEM;
- }
-
- if (!q->done)
- return EAI_AGAIN;
-
- if (ret_host && q->host) {
- strncpy(ret_host, q->host, hostlen);
- ret_host[hostlen-1] = 0;
- }
-
- if (ret_serv && q->serv) {
- strncpy(ret_serv, q->serv, servlen);
- ret_serv[servlen-1] = 0;
- }
-
- ret = q->ret;
-
- if (ret == EAI_SYSTEM)
- errno = q->_errno;
-
- if (ret != 0)
- h_errno = q->_h_errno;
-
- asyncns_cancel(asyncns, q);
-
- return ret;
-}
-
-static asyncns_query_t * asyncns_res(asyncns_t *asyncns, query_type_t qtype, const char *dname, int class, int type) {
- res_request_t data[BUFSIZE/sizeof(res_request_t) + 1];
- res_request_t *req = data;
- asyncns_query_t *q;
-
- assert(asyncns);
- assert(dname);
-
- if (asyncns->dead) {
- errno = ECHILD;
- return NULL;
- }
-
- q = alloc_query(asyncns);
- if (!q)
- return NULL;
-
- req->dname_len = strlen(dname) + 1;
-
- req->header.id = q->id;
- req->header.type = q->type = qtype;
- req->header.length = sizeof(res_request_t) + req->dname_len;
-
- if (req->header.length > BUFSIZE) {
- errno = ENOMEM;
- goto fail;
- }
-
- req->class = class;
- req->type = type;
-
- strcpy((char*) req + sizeof(res_request_t), dname);
-
- if (send(asyncns->fds[REQUEST_SEND_FD], req, req->header.length, MSG_NOSIGNAL) < 0)
- goto fail;
-
- return q;
-
-fail:
- if (q)
- asyncns_cancel(asyncns, q);
-
- return NULL;
-}
-
-asyncns_query_t* asyncns_res_query(asyncns_t *asyncns, const char *dname, int class, int type) {
- return asyncns_res(asyncns, REQUEST_RES_QUERY, dname, class, type);
-}
-
-asyncns_query_t* asyncns_res_search(asyncns_t *asyncns, const char *dname, int class, int type) {
- return asyncns_res(asyncns, REQUEST_RES_SEARCH, dname, class, type);
-}
-
-int asyncns_res_done(asyncns_t *asyncns, asyncns_query_t* q, unsigned char **answer) {
- int ret;
- assert(asyncns);
- assert(q);
- assert(q->asyncns == asyncns);
- assert(q->type == REQUEST_RES_QUERY || q->type == REQUEST_RES_SEARCH);
- assert(answer);
-
- if (asyncns->dead) {
- errno = ECHILD;
- return -ECHILD;
- }
-
- if (!q->done) {
- errno = EAGAIN;
- return -EAGAIN;
- }
-
- *answer = (unsigned char *)q->serv;
- q->serv = NULL;
-
- ret = q->ret;
-
- if (ret < 0) {
- errno = q->_errno;
- h_errno = q->_h_errno;
- }
-
- asyncns_cancel(asyncns, q);
-
- return ret < 0 ? -errno : ret;
-}
-
-asyncns_query_t* asyncns_getnext(asyncns_t *asyncns) {
- assert(asyncns);
- return asyncns->done_head;
-}
-
-int asyncns_getnqueries(asyncns_t *asyncns) {
- assert(asyncns);
- return asyncns->n_queries;
-}
-
-void asyncns_cancel(asyncns_t *asyncns, asyncns_query_t* q) {
- int i;
- int saved_errno = errno;
-
- assert(asyncns);
- assert(q);
- assert(q->asyncns == asyncns);
- assert(asyncns->n_queries > 0);
-
- if (q->done) {
-
- if (q->done_prev)
- q->done_prev->done_next = q->done_next;
- else
- asyncns->done_head = q->done_next;
-
- if (q->done_next)
- q->done_next->done_prev = q->done_prev;
- else
- asyncns->done_tail = q->done_prev;
- }
-
- i = q->id % MAX_QUERIES;
- assert(asyncns->queries[i] == q);
- asyncns->queries[i] = NULL;
-
- asyncns_freeaddrinfo(q->addrinfo);
- free(q->host);
- free(q->serv);
-
- asyncns->n_queries--;
- free(q);
-
- errno = saved_errno;
-}
-
-void asyncns_freeaddrinfo(struct addrinfo *ai) {
- int saved_errno = errno;
-
- while (ai) {
- struct addrinfo *next = ai->ai_next;
-
- free(ai->ai_addr);
- free(ai->ai_canonname);
- free(ai);
-
- ai = next;
- }
-
- errno = saved_errno;
-}
-
-void asyncns_freeanswer(unsigned char *answer) {
- int saved_errno = errno;
-
- if (!answer)
- return;
-
- /* Please note that this function is new in libasyncns 0.4. In
- * older versions you were supposed to free the answer directly
- * with free(). Hence, if this function is changed to do more than
- * just a simple free() this must be considered ABI/API breakage! */
-
- free(answer);
-
- errno = saved_errno;
-}
-
-int asyncns_isdone(asyncns_t *asyncns, asyncns_query_t*q) {
- assert(asyncns);
- assert(q);
- assert(q->asyncns == asyncns);
-
- return q->done;
-}
-
-void asyncns_setuserdata(asyncns_t *asyncns, asyncns_query_t *q, void *userdata) {
- assert(q);
- assert(asyncns);
- assert(q->asyncns = asyncns);
-
- q->userdata = userdata;
-}
-
-void* asyncns_getuserdata(asyncns_t *asyncns, asyncns_query_t *q) {
- assert(q);
- assert(asyncns);
- assert(q->asyncns = asyncns);
-
- return q->userdata;
-}
~ianmdlvl / elogind.git / blobdiff